Research conclusions: Adopting the crushed stone pile with pipe sinking method to reinforce the soft soil railway foundation in clustered depression at Yanrongfeng is probably difficult to form the pile when encountering the big steep and incline face of solution channel and fluid bowl or encountering the isolated stone of big grain size because of the developments of the solution channel and fluid bowl of lime rock in foundation base．After making comparison，the vibro—replacement stone column with perfect adptability is used．When the abnormal situation of the pile length of crushed stone pile due to the developments of the solution channel and fluid bowl of lime rock in soft foundation base in clustered depression at Yanrongfeng happens，the analysis should be made in combination with the pile length of adjacent pile SO as to eliminate the abnormal situation caused by the isolated stone in soil bed faced by the vibro—replacement head for ensuring the crushed stone pile penetrating into the soft soil bed as required in design．Based on the field tests，thestipulation is offered that the analysis should made in combination with the pile length of the adjacent pile when the pile length is l m shorter than the adjacent pile，and the measure of supplying pile is also presented for the abnormal situation of pile length caused by the isolated stone in soil bed faced by the vibro—replacement head．The application shows the equipment selection，construction technology，key points of quality control of crushed stone pile for the soft railway foundation in clustered depression at Yanrongfeng and its treatment measures are feasible．

Research conclusions: The soil pressure weight and pressure distribution of rigid retaining wall relate to the displacement way，the wall SUrface friction characteristics，and soil deformation characteristics of the retaining wall and other factors．The flexible retaining wall has the soil pressure with non—triangle distribution，and its soil pressure weight and pressure distribution relate to whether the soil body to achieve the limiting balance status，the displacement and creep deformation of soil body，construction procedure and the depth of foundation pit．The finite—element method plays the great role in calculating the soil pressure and with it the construction procedure can be simulated and the influence factors of time and non—linear displacement can be considered in calculation of soil pressure to solve the non—linear problems，such as heterogeneous material，complicated boundary and all isomerism．The appearance of contact unit makes the simulation more close to the real situation．

Research conclusions: The proposed valuesof testing standardwithEvdsuitable for"Interim DesignProvisions foraNew 200 km /hMixed Passengerand FreightRailway" are offered. The field verification of the proposed testing standardwith Evdfor subgrade quality presented in this paper is rational and can be as the reference to revising the relative norms.

Research conclusions: Through establishing the model and calculation, the model validation isverified by comparing the calculation results with the test results. Based on i,t the analysis of the dynamic characteristics of railway ballast is made. The results show that the contact force between ballasts transfers as nearly 45b, and there exists a vibration superposition effect within the ballast under neighboring sleepers for the ballast vibration acceleration and ballastcontact force. The ballast vibration acceleration, the dynamic displacement and the contact force are reduced as the depth of the ballastbed increases.

Research conclusions: Having done the overall research on the development concept，development theory and key technologies of French high—speed turnout，this paper presents the main technical characteristics of French high—speed turnout．The good integration of turnout structure with welded rail can ensure the stability of turnout geometry．The strict control of manufacturing precision can ensure the good regularity of turnout geometry and position．And the design concept of the mechanical—electrical integration can make the adaptation of locking system to free expansion of blade and point rails to ensure the safety and reliability of turnout behavior．All these can be as the references to our design of high—speed turnout．

Research conclusions: Based on the relative standards and the innovation achievements of the concrete materials for the ballastlees track of passenger dedicated line，the technical specifications are offered for the materials for slab used in the cold area，such as steel and concrete，and the prestress system of prestressed concrete slab is optimized as well as the authority manufacturing technique is formed．The successful application of this technique in cold area provides the perfect foundation for manufacture of the slab used in cold area．

Research conclusions: Through establishing the train model and solving the motion equation，this paper discussed the impaction of the track irregularity on vertical acceleration of train，and with the comparison of the relevant standards at home and abroad，presented the biggest high—low values of track irregularity to meet the requirements when the train speed reached at 300 km／h．Namely，when the vertical acceleration of train can meet the irregular comfortable value of 0．15g，the high—low value of track irregularity could be controlled within 8 mm．When the vertical acceleration of train can meet the maintenance target value of 0．25 g，the high—low value of track irregularity could be controlled within 14 mm．When the vertical acceleration of train can meet the safety management target value of 0．35 g，the high—low value of track irregularity could be controlled within 19 mm．

Research conclusions: From the analyses of fine adjustment of ballastless track，it is concluded when the rail of double—block ballastless track is adjusted precisely，the following procedures should be：Firstly，track gauge should be adjusted to between 1 435 mm and 1436 mm，and the gauge change between the adjacent sleepers should not exceed 0．5 mm．Secondly，the change between the adjacent the monitoring points for track direction and elevation should not exceed 0．5 mm．Thirdly，the following operating order should be followed：adjusting gauge，then rail surveying for fitting midline and obtaining track elevation data，after it，ordering gasket and chock block，then demarcating rail adjustment contents in site，finally adjusting rail to the accurate position quickly．

Research conclusions: Under the joints effects of axial pressure and temperature，the temperature，radial stress and normal stress in the same plain face of concrete filled steel column are of the curve function of the radius，and the polynomials of temperature is only affected by the thermal conductivity coefficient．The radial stress and normal stress are Not simply affected by the stiffness of steel and concrete，but both with the stiffness thermal conductivity coefficient．

Research conclusions: Taking construction of the underneath railway frame bridge at Lvshun North Road in Dalian as an example，this paper analyzes the load beating capacity of the reinforcement system for track on I—beam．The reinforcement system with longitudinal beam as the primary load—beating element can realize the unsupported jacking，but can only be applied in some small—span frame bridges，while the reinforcement system with the crossbeam as the primary load—beating element are more suitable for the large—span jack—in frame bridges．Besides，this paper offers a new way of calculating the beating capacity of the reinforcement system as the space structure．This method is easy， accurate and effective and it is wonh being applied widely．

Research conclusions: The study and analysis of the loading bearing performance at the junction between steel and concrete box girders show if the design is reasonable and the structure treatment is appropriate，the rigidity transition between steel and concrete box girders is fairly smooth，the significant effects aye produced from the imposed prestress， and the nodal displacements of steel and concrete coincide。The experimental results verify the results from all test points coincide with the calculation values and the finite element analysis can well simulate the actual loading scenario and load carrying condition at the steel—concrete conjunction model．

Research conclusions: From the study and analysis of the aseismic behavior of a long—span composite bridge with rigid frame and tender arch，it is concluded that，compared with the traditional bridge，the aseismic behavior of a long—span composite bridge with rigid frame and tender arch is better，but the joint between pier and girder and the pier bottom are poor at aseismic behavior．We should pay more attention in design．Generaly speaking，the tender arch has a larger displacement response，though its inner force response is small．Thus the arch top needs to be restricted due to great amount of transverse movement in ease，this type of bridge is built in a high—intensity earthquake area．

Research conclusions: The responses of the over—bridge structure to the vibration，stress and deformation were calculated and analyzed with finite—element analysis model for the over—bridge structure，and the monitoring contents and monitoring spots arrangement of the monitoring system were determined according to the control requirements for rough steel rolling．The monitored results indicate that the performance of the health monitoring system has satisfied the design requirements and the results can he as the reference to the similar health monitoring system for over—bridge structure．

Research conclusions: From the discussions on the spatial method and technology for geological forecast in advance with synthetic parameters and the simulation tests and field tests of USEP2 1 Integral forecast device，it is concluded： (1)The perfect synthetic parameters for the geological forecast in advance for tunnel construction under the complicated geological condition are wave velocity plus resistivity．(2)According to the characteristics of underground engineering， a series successful test achievements have been made by USEP2 1 Equipment which has bright future of being used in tunnel construction and underground engineering because it is rather adaptive to small space．(3)Application of the synthetic parameters，and the technology，method and theory of the spatial is an inevitable trend of geological forecast in advance．(4)The spatial multi component survey device of angle displacement is the most perfect means of geological survey in advance for underground engineering．

Research conclusions: (1)According to the analysis result of geological risk，the relative technology for geological forecast in advance was adopted for ensuring the reasonableness of the survey method and the reliability of the result． (2)The perfect procedure of geological forecast in advance and its management mode were established for accurately survey the unfavorable geological body．(3)According to the survey result and the water discharge and pressure，this paper puts forward the criteria for scheme selection and the evaluation method for grouting effect to safely treat the unfavorable geological body with money saving．

Research conclusions: In order to realize the operation of large—sized machine working，speed up construction process and decrease the temporary engineering，the area of the V grade surrounding rock was reinforced by grouting through pipes in advance and the preliminary support was strengthened following the working face．Also，full section tunneling and benching tunneling method were used，which can make large—sized machines easy to work for speeding up the construction process．The average length of tunneling of a month is 140 m by one working face．The benching tunneling method can be adopted for construction of tunnel in III grade and V grade surrounding rocks．

Research conclusions: Through application of risk management for construction of risk tunnel on Yichang—Wanzhou Railway，this paper summarizes the key technologies for eliminating water—bursting and mud—bursting risks in construction of karst tunnel．The application shows these technologies are available and have the significance to the risk control of constructing the similar tunnel．

Research conclusions: Taking construction of large railway tunnel as an example，this paper mainly studies the activities and balance laws of underground water，the influence of geological disasters caused by underground water and water leakage Off tunnel construction，the importance of underground water control，and the technical standards and measures for underground water control. The results show that it is very important to monitor underground water that flows from tunnel surrounding rock into tunnel in the course of tunnel construction and later，although it is difficult to analyze and predict the influence of underground water．Grouting the rock mass is the most effective way to control the underground water．

Research conclusions: Through researching the reverse procedure for engineering survey，the reverse procedure for railway engineering survey is worked out with the fx一4800P(4859P)calculator．The introduction is given to the applicable method of the reverse procedure and its applications in the measurement and lofting of the border pile and completion measurement．The calculation example shows this reverse procedure is reliable with perfect applicable value．

Research conclusions: The analysis of overall structure of the NSl25 Railway Crane was made with ANSYS Finite Element Analysis System in this paper．After assembling the components of the entire crane following modeling the components of the crane separately．me load calculation is conducted in the most dangerous working conditions．By calculating．the intensity and stiffness values of the overall structure of crane in the most dangerous conditions were obtained，and at the same time，the stiffness and strength distribution of the various components were alSO obtained．The results showed that the impact of the structural deformation of overall structure on the lifting range is allowable．and the calculated intensity values of the structural components meet the design requirements of the crane．

Research conclusions: The conflict between construction metro and the city traffic and environment can be overcome by using laying fabricated strap method．The risks caused by rebuilding or moving the underground pipelines can be avoided and the construction investment and time can be reduced by hanging the underground pipelines with protection measures．The design of metro station can be standardized by using laying fabricated strap method and standard temporary support components．This is the development trend of tunnel construction．

Research conclusions: Through analyzing the mechanism of harmonic generation and comparing the active filter system with the passive filter system，the harmonic treatment plan with active filter technology is pointed out and the introduction is siren to the working principle，installation principle and option requests of the active filter system．The application of active filter system shows using the active filter technology can effectively eliminate the harmonic current and enhance the power factor of power supply system．

Research conclusions: Developing BT mode can make the industrial capiml newly linking with the financial capitM to form a new financing pattern．It not only provides a new financing pattern for the government to solve the problem of difficult turnover of fund for construction of infrastructure，but also provides the pursuing target of the new profit Distribution system for investor and a new investment way for the surplus value．Using the BT mode not only gains the great investment benefit and improves the project management efficiency，but also enhances the humanities skill，the management level and the market competitive ability，obtains the financing experience with BT mode and increases the construction achievement to create the conditions of entering the financing market for construction．The BT mode expands the sources of fund to make the project smoothly turning over to the government，pushes forward the sustainable development of the local economy，enhances the economic efficiency and the social efficiency and sets up the model for other industry§financing．