Journal of Railway Engineering Society

Research methods: Combining with the engineering survey in the coal goaf and fault crush zone survey in the railway engineering and the evaluation of tunnel surrounding rock integrity, this paper carries out the seismic CT computation in the well adopting the ordinal wavefront reconstruction method, and analyzes and evaluates the application effect of the ordinal wavefront reconstruction method.

Research results: The application of ordinal wavefront reconstruction method obtains good survey effect. And the CT images of survey target bodies in the coal goaf, fault and highway tunnel etc. are very clear.

Research Conclusions: The seismic CT computation in the well with ordinal wavefront reconstruction method can solve the survey problems in the various goafs with buried depth (15~100 m), where the survey is difficult to use the general methods and its effect is also not good and in the unfavorable geology area with complicated rock stratum and texture combination.

Research methods: Some firstly chosen plants with salinity tolerance are made trial in lab. And suitable plants are chosen by the analysis of trial results.

Research results: Plants for constructed wetland in salty seashore area at the North of China and the preferential one with high salinity tolerance and good removal efficiency of nitrogen and phosphor are chosen.

Research conclusions: (1)Typha orientalis, Nymphaea tetragona, Lythrum salicaria, Scirpus tabernaemontani, Canna generalis and Iris pseudoacorus are chosen as suitable plants for constructed wetland in salty seashore area at the North of China, and in which Iris pseudoacorus is with high salinity tolerance. (2)As plants for constructed wetland in salty seashore area, Typha orientalis, Nymphaea tetragona, Scirpus tabernaemontani, Canna generalis and Iris pseudoacorus are of high removal efficiency of nitrogen and phosphor and Iris pseudoacorus is the preferential one. (3)Iris pseudoacorus, which generally has a long florescence of five or six months and has a characteristic of cold-resistant, could be the preferential plant for constructed wetland in salty seashore area at the North of China, not only with high salinity tolerance and removal efficiency of nitrogen and phosphor but also with good landscaping benefits. (4) Typha orientalis, Nymphaea tetragona, Scirpus tabernaemontani, Canna generalis as plants for constructed wetland in salty seashore area and Iris pseudoacorus as the preferential one for constructed wetland could be chosen for the areas with saline-alkali soil at the North of China.

Research methods: The systematical research on the engineering characteristics and engineering techniques for filling of slope weak foundation is made by the means of numerical analysis, centrifugal model testing, field monitoring and synthetic analysis.

Research results: Based on the concept of deformation control the suggested limit of equivalent safety coefficient and suggestion to design principle are put forward respectively for stabilizing the filling of slope weak foundation and mainly for limiting lateral deformation of slope weak foundation.

Research Conclusions: According to the concept of deformation control and on the basis of the evaluation and analysis of stability of slope weak foundation by adopting safety coefficient method, the factors of deformation features of slope weak foundation should be taken into consideration fully and the sampling safety coefficient for stabilizing embankment should be increased rationally in order to make slope weak foundation having the same stable level as that of lateral weak foundation. When filling embankment is conducted on slope weak foundation, the compressibility of soil of foundation and the bottom transverse slope should be inspected clearly and some measures should be taken for limiting the lateral deformation of slope weak foundation in order to guarantee the stability of slope weak foundation.

Research methods: Based on the research of Barton formula and combining with investigation on site s& laboratory test a new method to determine the roughness of discontinuity is put forward.

Research results: A parameter was introduced to determine the JCS which is an important parameter in Barton formula. Their mathematical relationship is fitted. The thickness of weak layer (flat layer) or filling degree (granulate layer) is introduced to determine the shear strength of weak rock layer.

Research Conclusions: Based on the correct determination of roughness, the estimated shear strength can be used to analyze the stability of slope. The method is easy, economic, fast, etc. and is more suitable in the field of highway & railway engineering.

Research methods: The research is made on layout mode of intermediate switch (web switch) and analysis is also made for applicable mode and the operation flow sequence of arrival and departure tracks in station and yard. The simulations are made for trains' parking locations in four sub-areas of arrival and departure tracks under different modes of makeup train according to traction modes of Modified SS4 and DJ Model electric locomotives, service operation procedure of locomotive passing in and out the depot, and length of new type locomotive. The research is made on essential conditions available for train's daily examination and the feasible and new layout mode of facilities available for train examination is offered.

Research results: The reasonable safe protection facilities and the wayside facilities for testing train braking system available for various conditions of running 20 000-ton trains shall be chosen.

Research conclusions: The electric derailers should be installed at both ends of line for train examination, manual derailers should be installed at intermediate web switch, and 4 wayside air-testing executors should be set for each track and the facilities for testing train braking system should be equipped with link status.

Research methods: This paper analyzes and estimates the main technical standards of horizontal control based on error theory. Firstly, it has analyzed the limiting error of 10 m-bowstring versine, which should be less than 2 mm, while considering the required precision of regularity of ballastless track laying.

Research results: This paper concluded the main technical standards of the control points for ballastless track laying on passenger dedicated railway lines, and the horizontal control of precise construction traverse and GPS survey. And the paper also puts forward some suggestions on projection deformation control and the design of construction coordinate system.

Research conclusions: The passenger dedicated railway lines need higher precision standards on ballastless track laying, and then the technical standards of horizontal construction control survey should be enhanced. So the establishing of horizontal control datum with appropriate precision standards systematically is the precondition to make sure the precision of ballastless track laying.

Research methods: By using 3D-FEM software, the analysis is made for pressure conditions of asymmetric continuous beam during construction stage and service stage, the section dimension of beam and the construction sequence for cantilever casting in place are designed.

Research results: The problem of balance of internal force within beam can be solved by adjusting the beam height and section sizes of side span and main span of the asymmetric continuous beam and the safety of construction of asymmetric continuous beam can be guaranteed and the requirement of liner for beam can be met by adopting reasonable construction method.

Research conclusions: Based on the requirements of bridge site and the analysis result of the bridge, an asymmetric continuous beam with the main spans arranged as(52+112+64)m asymmetric spans is adopted to the main bridge of Dayuanli double line extra-long bridge. The ratio of minimum side span to main span was only 0.464, and the problem of segment unbalance can be solved by adopting two parabola for beam curve and two different heights of beam. In addition, application of reasonable construction methods can guarantee the construction safety.

Research methods: The integrative space calculation model of rail-slab-bridge-pier is established by adopting the method of combining theory with trial research. The interactions of rail, slab, support layer and bridge are taken into consideration to the longitudinal direction of track. When the construction begins, the original test pieces are put on construction site in order to testify the theoretical calculation parameters.

Research results: The program of laying ballastless track on continuous rigid structure and simply supported T-beam is decided through making research on the feasibility of laying ballastless track on prestressed concrete continuous rigid structure at the location (94+168+84) m of Xinbeibei Jialing River Bridge and laying ballastless track on 24 m and 32 m simply supported T-beams of approach bridge.

Research Conclusions: The research indicates that it is feasible to lay ballastless track on the prestressed concrete continuous rigid structure with main span of 168 m and on 24 m and 32 m simply supported T-beams of approach bridge, which has broadened the applicable range of ballastless track and accumulated the new theoretical fruit for development of ballast track in China.

Research methods: Combining with the theory of materials mechanics and elasticity mechanics, the forcing condition on the contacting surface under the stationary condition should be calculated out initiatively. Then calculation imitating real condition has been done with the large general space finite element programmer.

Research results: According to the research of rigid frame's stress, strain and stability, a whole set of method of design and calculate have been summarized. The main calculation method and content of the rotational structure of highway T-shape rigid frame bridge have been showed in this paper, too.

Research Conclusions: During the rotational structure design shape and dimension of the rotational plate should be chosen according to the character of the rotational structure. The problems of the stress and strain on the connecting surface of rotational plate should be solved by calculation and analysis with the structure analysis programmer, then the economic and reasonable rotational structured should be worked out.

Research methods: For the natural ventilation tunnel without vents, according to research findings of laws of airflow motion within the tunnel and engineering case, this paper calculates the harmful gas concentration in each subsection of tunnel under the normal work conditions. According to hot pressure action principle, this paper also researches the calculation method for harmful gas concentration in the tunnel under the work conditions of traffic jam.

Research results: Under the normal and jam-up work conditions, the air quality within the tunnel with natural ventilation is improved obviously.

Research conclusions: In the one-way highway traffic tunnel with vents on the roof of tunnel, the natural ventilation can control the harmful gas concentration inside the tunnel within sanitary standards.

Research methods: ANSYS is used for analysis of the finite element internal force of local lining and Sweden slice method, Bishop method, JanBu method and the transmitting coefficients method are adopted for calculating the slope stability. Deliberate the design ideal of the EPC model that is how to have the factor of structure safety and normal service during the construction and operation period to be reflected in the design document.

Research results: By calculating the internal force of local lining, this paper determines the reinforcement arrangement method of the local lining at the corner of sidewall and invert in the open cut tunnel, and nearby the base for drop tube for OCS. By analyzing and comparing for the permanent and temporary side slope of the high side slope of tunnel, this paper determines the design principle of side slope. By comparing for 3 reinforcement arrangement proposals for lining in class II and III surrounding rock adopt the single layer reinforcement arrangement, this paper determines the design proposal of maintainable drainage system and waterproofing layer in open cut tunnel.

Research Conclusions: The reinforcement arrangement for lining should consider transmission for bending moment requirement of equipment fixed in the tunnel, the connection of intercross section between main tunnel and service gallery. The loess property, set-up the height and width of platform have a greater influence on side slope stability. The design of waterproofing and drainage system should consider construction process and maintainability. The detail and outreach design ensure the rationalization, the feasibility and safety of tunnel engineering efficiently.

Research methods: In the paper it is introduced that the engineering geological characteristics about stratum, geological structure, unfavorable geological condition, special soil and rock and environment in Dali-Lijiang railway. Based on different geological condition, this paper also briefly puts forward the corresponding methods or measures of engineering constructing and processing.

Research results: According to the geological characteristics of karst, landslide, dislocation, debris flow, bedding, soft soil and swelling soil, etc. the effective treatment measures has been put forward correspondingly for subgrade, bridge and tunnel works.

Research conclusions: Such consolidation methods as grouting consolidation, anti-slide pile, crushed stone pile and mixing pile are adopted for subgrade; such methods as pile foundation, replacement and strengthening of foundation rigidity are adopted for bridge; such support methods as big and small pipe roof advance support, steel frame and systematic rockbolt support are adopted for tunnel. These support measures form a complete set of support system, and these measures are proved reasonable and feasible in the construction excavation.

Research methods: Through theory analysis, the conditions of electromagnetic compatibility each other are found. And defending basis is provided for design through field testing and validation.

Research results: This paper recommended the scheme for “Current Situation of Electrification”. At the same time, this paper also proposed standby scheme and emergency scheme. In order to ensure flight safety, the checkout of aviation and the verification of defending effect should be implemented after electrification railway has the condition of power supply.

Research Conclusions: Passive interference and active interference of navigation facilities, which cannot satisfy national standards, are analyzed and the conclusions can provide the basis for design in theory. At the same time, the conclusions are verified through field testing and aviation checkout. The electromagnetic defending standards are satisfied both in conventional speed and in 200 km/h high-speed of the electrification railway.

Research methods: Based on the investigation of arrangement types of and operation status of auxiliary line in urban rail transit in China, the analysis and comparison are made for the differences among symmetrical turnout, three-way turnout and simple turnout. In addition, the research is made on the reasonable plane arrangements of symmetrical turnout and three-way turnout when stabling siding and inbound-outbound siding are connected with main line.

Research results: If symmetrical turnout or three-way turnout is adopted to replace simple turnout in urban rail transmit, by which the amount of construction work and construction cost can be reduced and the efficiency of train shunting operation can be improved.

Research Conclusions: The research shows that it is feasible and necessary to adopt the symmetrical turnout or three-way turnout for stabling siding and inbound-outbound siding. Moreover the related research work should be done and the turnouts should be produced urgently in combination with the process of construction of urban rail transmit.

Research methods: The research was made on the principle for working out turnout design parameters, the analysis was made for choosing turnout parameters by railway and metro and the rational design parameters of single crossover were ascertained. Then the safety of single crossover was checked by calculation and the rational structure of single crossover was selected.

Research conclusions: If the single crossover with 3.4 m distance between centers of lines is adopted in metro, the values of design parameters for turnout will not smaller than that of simple turnout at both ends. Under this condition, the running safety of train and comfortableness can be guaranteed when the subway train passes through the single crossover at the tolerated through speed of 30 km/h. The program of connection structure of single crossover is rational, which provides reliable support to design of single crossover with 3.4 m distance between centers of lines.

Research methods: By studying documentation and taking Datong-Qinhuangdao Heavy-haul railway for example, this paper determines the working scope and rational effective length of the receiving-departure track for heavy load train in technical station. Then, this paper finds out the shortages of existing middle switch setting by the combination of qualitative and quantitative methods, and discusses the setting of middle switch of receiving-departure track in technical station in the aspects of safety, convenience for traffic organization and improving the working efficiency in railway station.

Research results: This paper finds out the setting of the middle switch in technical station for receiving and departure of 20 000-ton trains, which can meet the requirements of safe distance and enable train access to the receiving-departure track through the middle switch. In addition, this scheme can both satisfy the technical requirements of receiving and departure of ordinary trains and 10 000-ton trains.

Research Conclusions: The minimum total length of the receiving and departure track for 20 000-ton train in technical station is 3019.24 m; the effective lengths of the segments of the 3 middle switches are 665.24 m, 665.24 m, 665.24 m and 850 m respectively.

Research methods: The optional computing data of structure is made certain by colligating analysis on the project and integrating the result researched by the others of this subject in China. 3D3S software which is steel structural calculating system is used by calculating and checking.

Research Conclusions: Under the complicated existing condition in the station, the section size of supporting columns and the structure height being limited, the columns are located among the tracks for the first time and some innovated design and technology are adopted, such as large span over-passing two platforms, long-suspending-extending structure and so on. Thus, it is realized that there are no columns on all platforms. This research resolved many difficulties in engineering process. On the other hand, it is indicated that large span and steel structure is the same with construction of no-platform-column canopies.

Research methods: The calculation of the stakes is based on the vertical elasticity groundsill beams and adding to the displacement and deformation in advance. The calculation of the station is based on the frames on the landscape orientation and portrait elasticity foundation.

Research results: The deformation of the enclosed stakes during the process of digging is small and the value is under permission. The integer stiffness gets well and the settlement of the whole construction is small. There is no asymmetry sedimentation.

Research Conclusions: The design method of the station which is the foundation of the structure above and the stake foundation bearing the total loading is feasible. There are many problems to research during the design of complex foundation of the station and stake foundations, which is the research direction for the future.

Research methods: Different construction methods will be applied in three different areas during building of new line. The problem is rather complicated; therefore the incremental finite element elastic analysis method will be used to simulate the whole construction process. The construction method of new line will be optimized based on the computed data.

Research results: According to the relative position to existing structure, the whole area of new line is divided into three parts, namely the middle part and two sides. The middle part is excavated incrementally and braced in time, which results in the heave no more than 2.67 mm. The crest of heave which is 7.82 mm occurred during rather than after the construction. When the construction sequence of the two sides is changed, the maximum heave of existing line structure during the construction reduces to 7.43 mm while the final heave value is almost unchanged.

Research Conclusions: Reasonable construction method can efficiently control the heave of existing building regardless of its short distance to the new line. The maximum heave may occur during the construction period. Reasonable construction sequence can contribute to control the heave value of existing building.

Research methods: Unifies overseas information security rank protection criterion and the domestic information security rank protection standard system, this paper uses qualitative analysis of the research technique which unifies with quantitative analysis.

Research results: Through credible securities product rank appraisal criterion research to the domestic and foreign, it has formed the multistage information system safekeeping of security system from the whole. In view of the information security risk assessment project implementation process, this paper proposed a kind of information security appraisal method based on the rank protection thought.

Research conclusions: Complete, correct understanding each safekeeping of security rank safe request and reasonably sets a target the system safekeeping of security rank, is reasonably utilizes the security rank protection the important premise which comments to the information security risk. The information security risk assessment based on the rank protection thought is one effective information security risk assessment method. It is advantageous to the implementation of the information system security construction.

Research methods: Using strategic management theory marketing theory and enterprise cultural shaping theory in modern enterprise management for reference, and combining the developing stage and environment of railway survey and design enterprises in China, this paper analyzes the significance of upgrading enterprise core competition by brand implantation and puts forward several methods to realize the goal of brand implantation.

Research results: After analysis and study this paper considers there are 6 main methods to promote the brand implantation of railway survey and design enterprises, namely target market plan, brand orientation, core value abstraction of brand visual identification construction enterprise cultural environment building and exterior communication.

Research conclusions: An outstanding brand is the organic integrity of public impression and internal connotation. Once possessing a strong brand, the enterprise will hold the imitative and take the leadership in the market Because of the important strategic function and the systematicness and complexity on brand implantation in railway survey and design enterprises it should be built solidly as a systematic engineering in upgrading comprehensive strength for one enterprise.

Research methods: Based on the relevant theory and data collected from correlative documents, works at home and abroad, web sites and newspapers & magazines, this paper adopts the document analysis method and theoretical summary method combined with the inductive & deductive method to summarize the main elements making up the core competition of engineering consulting enterprises.

Research conclusions: Combining with the peculiarity of engineering consulting enterprises, this paper performs an analysis of the key elements of core competition, which is composed of 6 aspects, namely social influence, technical innovation ability, market opening up and marketing ability, engineering project management ability and resources management ability & knowledge management ability.