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2015 Vol. 32, No. 9
Published: 2015-09-16
Geology and Subgrade
Bridge Engineering
Tunnel Engineering
Electrification Engrinnering
Survey and Design
Urban Rail Construction
Energy Saving and Environmental Protection
 
       Survey and Design
1 Research on the Integrated Alignment of Geothermal District of Lhasa - Rikaze Railway Hot!
WANG Zheng - ming
Research purposes ： Railway integrated alignment design is the important and difficult point for the project， and it is directly related to the reliability and economy of project construction. Through the analysis of high geothermal distribution of Lhasa - Rikaze Railway and the harmfulness influences on the project， the railway alignment principles and design concepts of geothermal district have been proposed in the paper， as well as the geothermal integrated solutions. These are valuable for popularization and application on integrated alignment design and engineering construction of geothermal anomaly district in future. 
Research conclusions ： (1) According to the influence degree of the geothermal harm on the tunnels construction and operation，the geothermal temperature of Lhasa - Rikaze Railway tunnels is divided into 5 levels. (2) The geothermal will affect tunnel project on the construction environment，the efficiency of construction，the selection of building materials， structure safety and operation maintenance and so on. ( 3 ) By the summary and analysis of geothermal project， the railway alignment principles and concepts of 11 first open line， shallow tunnel depth， high line location11 should be insisted. (4) When the railway across geothermal area， firstly it is necessary to take fully account of the geothermal problems in design， secondly it is necessary to organize geological forecast work well in advance， meanwhile it is necessary to apply scientific and reasonable engineering measures. (5) By the integrated research on geothemal project， the design principles and concepts of railway alignment are proposed，，the results have great value to reference for similar projects.
2015 Vol. 32 (9): 1-5 [Abstract] ( 3328 ) HTML (1 KB)  PDF  (691 KB)  ( 2614 )
6 Research on the Automatic Station Locating under Intricate Constraints
PU Hao, ZHENG Xiao-qiang, LI Wei, LIU Wei
Research purposes ： The railway optimization is developing towards collaborative optimization of line - station，which is based on automatic station locating. Traditional research is lack of systematic consideration about complex constraints among the alignment - stations - environment - structures，which mostly focus on how to select the best station location in the case of the station location alternatives. This paper proposes a method of automatic station locatingunder complex constraint conditions which can divide station locating into station center selection and site direction selection and can quickly and automatically search economic station schemes satisfying the intricate constraint conditions，to provide a reference for designers.
Research conclusions ： ( 1 ) Integrated geographic infomation model based on the system of spatial grid index was established to provide data foundation for station locating. (2 ) Calculation efficiency of the method was increased by divided thought of station center and site direction. (3) A model for calculating the station comprehensive cost was raised considering the cost of land，quantity of earcth work，distance to economic point，deviation to expected route，providing the basis for evaluating the perfomance of stations. (4) A railway in southwest mountain area was analyzed to verify the effectiveness of this method，and the station schemes satisfying the intricate constraint conditions can be quick?ly figured out，which lays the foundation for line - station collaborative optimization.
2015 Vol. 32 (9): 6-12 [Abstract] ( 3354 ) HTML (1 KB)  PDF  (1450 KB)  ( 2845 )
       Geology and Subgrade
13 Research on the Comparison and Selection of Gradient Schemes of the Karst Region on Qianjiang - Zhangjiajie - Changde Railway
LI Jin - cheng
Research purposes ： Qianjiang - Zhangiajie - Changde Railway is a regional trunk railway，shared by both passenger and freight trains，but mainly employed for passenger trains. Because of the typical karst development along the railways，the geological construction is very complicated， and the project investment is huge. Thus， different gradient schemes should be compared and selected，in order to determine the most reasonable gradient for the railway. Incorporated with the geological features along the railway，the project investment and risks of 13%c and 11%c gradient schemes were compared and selected. The tractive tonnage， reasonable combination of locomotive types and their compatibilities with the nearby railways were analyzed. Additionally， the transport quality and operating costs were economically evaluated. Research conclusions ： We can draw the following conclusions through comparing and selecting the schemes ： (1) The both gradient schemes meet the relevant safety requirements for operation. (2) H%c gradient scheme is better than the one of 13%c due to lower project risks and investment. Therefore， 18%c gradient scheme is recommended. (3) The process of comparison and selection of gradient schemes for Qianjiang - Zhangjiajie - Changde Railway could be employed as a reference for comparison and selection of gradient schemes of railways in karst regions.
2015 Vol. 32 (9): 13-18 [Abstract] ( 4535 ) HTML (1 KB)  PDF  (394 KB)  ( 2677 )
19 Research on the Growth Characteristics and Slope Protection of Artemisia Ordosica in Yan’ an Area
XU Rui1，GUO Lu1，LI Xun - chang1，DONG Qi2
Research purposes ： Artemisia ordosica is the suitable species for ecological restoration. Studying of dominant families and genera as well as growth characteristics plays an important role in loess slope stability and ecological restoration. Based on the investigation of local natural growth dominant plant artemisia ordosica on loess slope in Yan an area，though the statistics of vegetation density，growth characteristics，and Simpson index of artemisia ordosica of loess slope，the loess slope protection of artemisia ordosica is presented，which provides a reliable basis for the design of compound ecological protection to loess slope in Yan an area.
Research conclusions:(1) The vegetation species diversity is below the medium level in Yan an area，which accords
with the slope vegetation composition characteristics of loess plateau semiarid areas. (2) Artemisia ordosica is the main varieties of loess slope vegetation due to its drought and freezing tolerant. (3) The artemisia ordosica quantity decreases with the increase of gradient or the decrease of soil moisture，but the relative dominance of artemisia ordosica on loess slope increases. (4) Based on the analysis of slope protection of artemisia ordosica，the selection of vegetation type and structural design of eco - engineering for loess slope protection under different slope gradients are suggested. (5) Theresearch results can be the guidance for loess slope ecological protection technology in northwest China.
2015 Vol. 32 (9): 19-24 [Abstract] ( 5135 ) HTML (1 KB)  PDF  (1117 KB)  ( 3016 )
25 Research on the Cause of Expressway Embankment Landslides and Their Treatment Scheme
CHENG Yong - gang1，WU Liu - zheng1，ZHAO Xiao - yan2
Research purposes ： Embankment landslide is a kind of engineering landslide caused by human activities transforming natural environment， which is often formed due to weak strata， steep slope area， river erosion， slope catchment，a retaining engineering problems，influence of old landslide，poor construction quality and steep fill slope. In order to reasonably analyze the embankment landslide geological factors and human factors，determine the reasonable project management plan， this paper takes a highway embankment landslide for example， analyzes the embankment landslide causes and treatment scheme. Research conclusions ： (1) Embankment landslide is caused by many factors，reasonable analysis of the key factor is the key to determine the management scheme. (2) Embankment project design is based on detailed geological data，and engineering construction is based on strict engineering quality， which is the premise to avoid embankment landslide. (3) Embankment landslide tends to form a larger social impact. In addition to considering the safety and economy of the project，the determination of treatment scheme should also consider the social impact. (4) This paper on embankment landslide causes and treatment scheme，can provide effective reference for similar engineering landslide governance.
2015 Vol. 32 (9): 25-29 [Abstract] ( 4511 ) HTML (1 KB)  PDF  (736 KB)  ( 2650 )
30 Research on the Settlement of Soft Soil Composite Foundation for Wuhan Experimental Section of Wuhan - Guangzhou High - speed Railway
ZHANG Feng, LIU Ying, XU Zhao -yi, LI Zhi -yi
Research purposes: Control of post construction settlement under poor geological condition is the key issue in high - speed railway design. The greater post construction settlement will have bad effects on the operation of high - speed railway. Using finite element method (FEM)，this paper studies on the CFG pile composite foundation treatment of the soft soil subgrade settlement properties of the high - speed，as an example of Wuhan comprehensive test section of Wuhan - Guangzhou high - speed railway.
Research conclusions ： The result shows that ： ( 1 ) The settlement amount gradually increases with the enhancing of height of the embankment. The settlement amount of composite foundation of CFG pile end decreases with the increasing of distance from the center of embankment，and rapidly decays in the outside of the top width of the subgrade. (2) The stress ratio between CFG pile and soil decreases with the increasing of the height of embankment，the load is becoming more uniform of CFG pile and soil. The stress ratio of CFG pile and soil increases with the distance from the center of embankment，embankment centers force of piles and soil are more uniform. (3) Subgrade pore water pressure increases rapidly accompanied with the increase of embankment height， and begins to dissipate after completion of loading
process. A year after the subgrade construction，embankment center pore water pressure almost spreads evenly,and its number is about 38 kPa. (4) The research result can provide a reference for the settlement control of soft soil composite foundation of high - speed railway.
2015 Vol. 32 (9): 30-34 [Abstract] ( 2723 ) HTML (1 KB)  PDF  (567 KB)  ( 2707 )
35 Research on the Long - term Stability of Subgrade in Cold Region and Its Effect Hot!
SUN Wen，WU Ya - ping，GAO Zun - ming
Research purposes ： Theory of problem study of the long - term stability of subgrade in cold region still can not fully meet the needs of practical engineering. The low embankment structure of short， medium and long term reliability and permafrost environment stability in cold area was predicted， and it provides the theoretical support for subgrade maintenance and possible disease management during the operation.
Research conclusions: (1) In order to ensure the long - term stability of the subgrade，it is necessary to take measures to protect the frozen soil. The heat pipe is a good measure. (2) In the process of protecting the frozen soil，the cooling effect of the heat pipe is obvious，and the heat pipe subgrade can counteract the adverse effect caused by the climate warming to the subgrade. (3) The heat preservation effect of the subgrade is also significant，the higher the subgrade the better the insulation effect of frozen soil，the lower the effect of the insulation of the frozen soil is worse. (4) When the subgrade height is lower than some limit，it can not only play the role in insulation of the frozen soil，but will make the temperature of frozen earth temperature rise. (5) The research results can provide references for the design and renewal of various subgrade structures in the cold regions of China.
2015 Vol. 32 (9): 35-40 [Abstract] ( 2891 ) HTML (1 KB)  PDF  (1000 KB)  ( 2689 )
41 Seismic Stability Time - frequency Analysis Theory Resolution of Reinforced Retaining Wall Hot!
YANG Chang - wei1，ZHOU Feng2，YANG Guo - tao2，ZHANG Jian -jiiig1
Research purposes ： A large of research results show that there are more significant effect of the duration time and frequency on seismic stability of reinforced retaining wall. However， the common methods are pseudo - static method and limited displacement method at present，which can not consider the duration time and frequency of input wave. Therefore，based on the elastic wave theory，this paper summarizes the dynamic analysis model of the reinforced retaining wall，establishes the force equilibrium differential equation by horizontal slices analysis method，puts forward the time - frequency analysis method of the seismic stability of reinforced retaining wall under the action of earthquake by Hilbert - Huang transform， which can provide some valuable references for the time frequency seismic design of the reinforced retaining wall and other retaining structures.
Research conclusions ： ( 1 ) A time - frequency analysis method of the internal anti - seismic stability analysis of the
retaining wall is proposed considering the three elements of seismic waves (peak，frequency and duration). (2) The influence of the lacing wires types，the seismic intensity，internal frictional angle of the filling earth and the frequency of the input earthquake wave on the needed total tensile force of the lacing wires is analyzed，which is that the needed total tensile force of the lacing wires increases with the increase of the seismic intensity and the decrease of the internal frictional angle ； the needed total tensile force of the expandability lacing wires is bigger than that of the non - expandability lacing wires ； the needed total tensile force of lacing wires is distributed in the shape of saddle and the force achieves the maximum value when the frequency of the input wave is the same as the natural frequency of the reinforced retaining wall. (3) If the reinforced retaining wall is designed according to the rules considering only the peak ground motion not input wave frequency， the emergency capacity of the reinforced retaining wall will be reduced. (4) The active crack angle gradually increases with the increase of internal frictional angle，however，the active crack angle of earth filling behind retaining wall gradually decreases with the increase of internal frictional angle.
2015 Vol. 32 (9): 41-48 [Abstract] ( 2927 ) HTML (1 KB)  PDF  (857 KB)  ( 2726 )
49 Model Test Research on the Working Performance of Double - row Anti - slide Pile
WU Hong - gang, ZHANG Qian - yi, ZHOU Zhang - bo, ZHANG Jun - de, SONG Xiang -jun
Research purposes ： As the accelerating pace of construction in domestic highway, railway and civil aviation, there are many engineering landslides with a huge thrust. Double - row anti - slide pile has been widely used as the effective measures of the large - scale landslide governance, however, the working performance of double - row anti - slide pile , such as bearing capacity and deformation failure pattern, was in the situation of lack adequate understanding. On the basis of the prototype of accumulation landslide governance with double - row anti - slide piles, the ultimate bearing capacity and deformation and failure process were studied through geomechanical model test.
Research conclusions: (1) The test plan for the three stages of destructive test was made firstly. The piles in front and
back row have different degree of fracture damage in each scheduled trial stage, and the damage pattern is given priority to tensile and bending failure. (2) The three stages characteristic of displacement curve is obvious such as the development of slow , fast , and acceleration in the first and third process of test. The linear trend curve is presented in the second test stage. (3) Soil pressure distribution along the pile is in line with the current calculation assumption. As a result of the existence of friction of soil between piles, the thrust distribution of front and back row piles is quite uneven, and the back row pile plays the key role in the aspect of thrust bearing. The change stages of soil pressure
contain three parts of slow development，rapid development and attenuation as a whole. (4) The research result has important theoretical and practical significance to applied research of double - row anti - slide pile of large scale landslides control.
2015 Vol. 32 (9): 49-54 [Abstract] ( 2732 ) HTML (1 KB)  PDF  (1004 KB)  ( 2867 )
55 Life Prediction for Geotextile in Saline Soil Roadbed of Heavy Haul Railway
CHEN Wen - hua
Research purposes: For lack of the research results of geotextile field life at home and abroad，in this paper， the lab and field researches are carried out to find the engineering life and protect technology in field. which will provide reference for the design and construction of geotextile in heavy haul railway roadbed.
Research conclusions ： (1) A preliminary estimated life of two cloth a membrane geotextile in saline soil embankment is within 80 years by tracking experiments. (2) The effect sequences of aging factor of two cloth a membrane geotextile are as follows ：ultraviolet，high pressure，salt pond water，sea water，etc. (3) The engineering sampling period is suggest
as 10 years based on field sampling test and operating line survey. (4) The research results can be successly used in
some saline soil railway, highway and civil aviation engineering.
2015 Vol. 32 (9): 55-59 [Abstract] ( 2751 ) HTML (1 KB)  PDF  (689 KB)  ( 2576 )
       Bridge Engineering
60 Research on the Resonance Response of Simply - supported Railway Bridge Before and After Reinforcement Hot!
ZHOU Chang - dong1，LIU Bin2
Research purposes ： According to the change of natural frequency of the simply - supported railway bridge before and after strengthening， the resonance speed of train is changed. So it is necessary to analyze the resonance response whether meet the requirements when the bridge is strengthened. In this paper，the resonance mechanism about vehicle - bridge system is introduced， the influence factors of resonance response about vehicle - bridge system are studied，and the dynamic interaction between train and bridge before and after strengthening is analyzed through ANSYS and multi - body dynamics software UM.
Research conclusions ： (1 ) Results of the vehicle - bridge simulation calculation indicate that the resonance speed is changed before and after strengthening of the straight small span bridge. (2) The resonance speed outstrips the normal speed range of high speed train after strengthening of bridge. (3) The vertical amplitude and acceleration of bridge when the train on second resonance speed is much lower than that of the first resonance speed，so it can be ignored. (4) The amplitude and acceleration can be reduced obviously when vertical and transverse bridge resonance occurs according to the strengthening of bridge. (5) The research methods and results can provide references for the resonance control of the simply - supported railway bridges.
2015 Vol. 32 (9): 60-66 [Abstract] ( 4851 ) HTML (1 KB)  PDF  (778 KB)  ( 2764 )
67 Study of Skew Continuous Steel - box Girder Bridge Affected by Diaphragms Arrangement
DAI Gong - lian，SU Miao
Research purposes ： The orthogonal cross beam is benefit to the load transferring and construction assembling for the skew continuous steel - box girder bridge. In order to optimize this diaphragm arrangement further by simplifying the structure of the support point，a novel diaphragm arrangement idea was presented in this paper through canceling the inclined diaphragm at the support points of the middle pier. Then the feasibility of this idea was studied and verified.
Research conclusions ： (1) Taking a (30 + 35 ) m skew continuous steel - box girder as the engineering background，the finite shell element models of whole bridge were established. The calculated results show that this novel diaphragm arrangement can meet the design requirement both in the two aspects of the structure global mechanical behavior and local stress. (2) Compared with the oblique crossing diaphragm arrangement，the structure mechanical behavior has little difference regardless of the diaphragm arrangement is adopted when the skew angle is less. (3) By optimizing the structure details of the novel diaphragm arrangement further， its adaptability in the skew continuous steel - box girder bridge with large hollow box section and large skew angle was discussed. (4) The conclusions could provide some theoretical reference for the diaphragm design of the skew continuous steel - box girder bridge.
2015 Vol. 32 (9): 67-72 [Abstract] ( 5521 ) HTML (1 KB)  PDF  (1004 KB)  ( 3101 )
73 Research on the Prevention and Treatment about Bridge Engineering Disease in Deep Soft Soil Area
KANG Cheng - lei1，LIN Wen - quan2
Research purposes ： The main line bridge through Luoya Village in the third tenders of Kunming Nan highway connecting is located in deep soft soil area of the Dianchi rift basin. Through analysis of the disease case of main line bridge through Luoya Village，this paper proposes measures and suggestions to control engineering disease of the deep soft soil foundation bridge，to provide a reference for the design and constmction of deep soft foundation bridge in the future. Research conclusions ：(⑴ The influence of negative frictional resistance in deep soft soils on bridge construction and operation safety is more sensitive than general soft foundation， so this must be fully considered in the design，and the adverse effects of unbalanced load or load shedding must be fully thought about in the process of construction，operation and subsequent land development. (2) The design of deep soft foundation bridge must fully consider the necessary basic settings such as constriction road，and the engineering activities that may have adverse effects on the environment of the surrounding area will be strictly limited in design notes. (3) The research result is suitable for bridge engineering design， constriction，security protection and surrounding land development in the deep soft soil area，also provides a reference for the safety constriction of other engineering in deep soft foundation space.
2015 Vol. 32 (9): 73-78 [Abstract] ( 4933 ) HTML (1 KB)  PDF  (573 KB)  ( 6283 )
       Tunnel Engineering
79 Research on the Effect Mechanism of Cavity behind Tunnel Lining under the Earthquake Action Hot!
ZHU Zheng - guo，GENG Ya - shuai, WU Jie, ZHU Yong - quan, WANG Dao - yuan, HAN Xian - min
Research purposes ： Cavity behind tunnel lining has great effects on tunnel anti - seismic. Based on the background of the Kuokesa tunnel of Dunhuang to Geermu in high intensity seismic region, this paper studies the effect mechanism on seismic dynamic response of tunnel structure with factors such as the location of cavity behind tunnel lining, cavity size, surrounding rock grade and depth, and proposes the rational reinforcement plans to ensure the operational safety of tunnel under the earthquake action.
Research conclusions: (1) Cavity reduces the defomation perfomance and seismic property of lining structure.
(2) The most sensitive factor is surrounding rock grade, following are cavitys hoop size, location, radial size and axial size, and tunnel depth is the least intensive factor. ( 3 ) The grouting reinforcement scheme can reduce tensile stress, and improve the intenal and stress distribution on tunnel lining. The effect of backfilling grouting + reinforcement with arch surround is better than that of backfilling grouting + bolt, the scheme of backfilling grouting + reinforcement with arch surround + bolt has the best anti - seismic effect. (4) The research results have some guiding significance on effect mechanism and optimized reinforcement project selection of cavity behind tunnel lining under the earthquake action.
2015 Vol. 32 (9): 79-84 [Abstract] ( 4531 ) HTML (1 KB)  PDF  (531 KB)  ( 3025 )
85 Study and Application of Concrete Quality Evaluation at the Bottom of the Railway Tunnel Hot!
ZHANG Min -qing，HE Zhi - jun，YOU Xu，WU Chuan，GAO Jin -xi
Research purposes ： The bottom of railway tunnel is the bearing structure of train operation，quality defects easily induce operating tunnel floor heave，mud pumping，cracking and other diseases，thus seriously interfere with the transport，affect driving safety，economic loss is very large. So the evaluation of the hierarchy and treatment scheme of concrete quality defects at the bottom of railway tunnel is necessary.
Research conclusions ： (1) The root cause of quality defects at the bottom of tunnel is the weak site management，
therefore，must strengthen management， and strengthen inspection and supervision， to avoid thequality defects at the bottom of the tunnel. (2) The defect area ratio and the defect thickness ratio are used to evaluate structure defects at the bottom of railway tunnel，the results of the evaluation can be divided into five levels ： slight，more serious，serious，very serious and extremely serious. (3) According to different defect， the corresponding processing schemes such as grouting，grouting + anchor，dismantlement and redoing can be adopted. Taking the dismantlement and redoing，less than lining shutter length 3 m as a dismantled length unit， by the finite element numerical simulation and field application，has little influence on surrounding rock，initial support and secondary lining，and is safe. (4) The research results can be used for quality rating and processing of railway tunnel concrete.
2015 Vol. 32 (9): 85-91 [Abstract] ( 5186 ) HTML (1 KB)  PDF  (954 KB)  ( 2933 )
       Electrification Engrinnering
92 Test and Analysis of the Electromagnetic Influence of Signal Cable on Tianjin - Qinhuangdao Passenger Dedicated Railway Line
CHANG Yuan - yuan1，WU Ming - li2，WEI Ji - xiao3
Research purposes ： The signal cables along high speed railway are always affected by the traction power supply system. Combined Tianjin - Qinhuangdao Passenger Dedicated Line's alignment joint - test，we took a series of test measuring the induced voltage on signal cable by an electromagnetic interference causing from the traction power supply system. The length of the testing cable is 2. 7 kilometers， and we set two kinds of shielding layer grounding mode，one is single ended grounding， the other is double ended grounding. The signal cable s voltage and current of both core wire and shielding layer were tested under the condition of traction power supply s normal operation and short - circuit fault condition. This paper can offer rich data and effective analysis on the field of electromagnetic influence from traction power supply and the signal cable electromagnetic protection design.
Research conclusions:(1 ) The core wire's induced voltage can reach to 36 V under the normal condition of contact  line，360 V under the fault condition. (2)The design specification that making shielding layer signal ended grounding every 3 kilometers is tolerable in electromagnetic protection design under connect line's normal operation condition.(3) Longitudinal induction electromotive force produced by the cable side line load is 1. 3 times of the far side line， longitudinal induction electromotive force produced by the direct feeding power supply system is more than 4 times of the all parallel AT power supply mode. (4) When the shielding layer was double end grounding，the induced voltage can fall to half of the former value，but there will be current flowing in the shielding layer and the current will cause dangerous when the contact line was short circuited. So we should chose different grounding method according to the safety level requirement of signal cable and special condition of railway line. (5) This research result can provide guidance and reference for signal cable grounding method selection and electromagnetic compatibility design of high speed railway.
2015 Vol. 32 (9): 92-96 [Abstract] ( 4561 ) HTML (1 KB)  PDF  (759 KB)  ( 2687 )
       Energy Saving and Environmental Protection
97 Experimental Research on the Carbonation Resistance of Natural Pozzolanic Concrete
CUI Sheng - ai，LIU Pin, SHEN Bin - ran
Research purposes ： Taking natural pozzolanic concrete as the study object, this paper carries out a comparative analysis on the carbonation resistance of basic concrete (no mineral admixture) , pozzolanic concrete and fly ash concrete through accelerated carbonation test and differential thermal analysis. It also studies the improvement effect of adding few silica fumes on the carbonation resistance of pozzolanic concrete. The experimental study can provide technical guidance for actual engineering.
Research conclusions: (1) Under the dual effect of reduction of cement clinker and consumption of secondary hydration, the contents of Ca ( OH) 2 in pozzolanic concrete and fly ash concrete both decrease, so the carbonation resistance remarkably declines compared with that of basic concrete. (2) Under the same amount of admixture, comparing the fly ash concrete with the pozzolanic concrete, the carbonation resistance of the former is better than the latter. (3 ) The carbonation resistance of pozzolanic concrete mixed with silica fume increases significantly. The pozzolanic concrete mixed with 5% of silica fume, is even better than the fly ash concrete. Therefore, in terms of carbonation resistance, the fly ash concrete can be replaced by pozzolanic concrete mixed with 5% of silica fume.(4) The macroscopic experimental results are validated and analyzed by differential thermal analysis experiment.(5) For concrete engineering with rich natural volcanic ash resources, the research resutlts can stimulate the effective utilization of local resources, and bring the environmental benefits and economic benefits for actual engineering.
2015 Vol. 32 (9): 97-102 [Abstract] ( 2759 ) HTML (1 KB)  PDF  (612 KB)  ( 2527 )
       Urban Rail Construction
103 The Medium and Low Speed Maglev Train - Track Beam Coupling Vibration Model and Verification Hot!
LI Xiao -zhen1，HONG Qin -ye1，GENG Jie2，LIU De -jun1，SHAN Chun -sheng1
Research purposes ： In our country under the background of new construction of medium and low speed maglev operation，because the low speed maglev rail beam is relatively light， in order to ensure the safety and comfort， the maglev train - track beam coupling vibration should be analyzed and verified. Based on the engineering background of 20 m simply supported beam of maglev test line in a factory of Zhuzhou，this paper establishes the secondary suspension quality - spring - damper model that vehicle is 12 degrees of freedom， builds maglev trains and track beam vertical coupling vibration analysis model considering the impact of track irregularity，and designs the simulation analysis software VTBIM. Through comparing the simulation value with the measured values，the rationality of the model is verified.
Research conclusions ： (1) Test the fundamental frequency，vibration mode and span dynamic deflection / acceleration of the beam， and the fundamental frequency and vibration mode test results are slightly smaller than the simulation values. (2) When maglev vehicles go through the simply supported beam， the measured values of span dynamic deflection / acceleration of the beam are slightly smaller than the simulation values，the theoretical simulations variation law with the speed is consistent with the measured law，time - history curve of the deflection is consistent with the measured curve. (3) The vertical model of the medium and low speed maglev train - track beam coupling vibration which is built in this paper is reasonable, the result of simulation program in this paper is effective. (4)The result can
be applied to medium and low speed maglev track beam design.
2015 Vol. 32 (9): 103-108 [Abstract] ( 2994 ) HTML (1 KB)  PDF  (667 KB)  ( 2624 )
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