Research conclusions ： This new method not only contains the free stationing feature of leveling but also eliminates the error by virtue of the height measuring of the equipment and the prism during surveying with high feasibility and efficiency. It is proved this is a good way to solve the problem between railway girder precision adjustment in vertical control network above the bridge and ground vertical control network during construction. Comparative analysis is made in this paper to prove the new method is much more superior than that of traditional trigonometric leveling. The precision can satisfy second - order leveling under observation conditions of suitable distance( ≤60 m) and suitable vertical angle (≤20°) if a suitable Total Station is used.

Research conclusions： The paper synthetically, analyzes the problems of most affecting the data sharing in design, gives a data sharing mode and presents the design flow and method for the data sharing interface designing flow among specialties. Finally the paper concludes the data utilization rate will be enhanced much and design efficiency will be improved much by adopting professional data bank, and using COM，the data interface is easy to be realized with software.

Research conclusions : The basalt along the railway often locates on the earth s surface and lies into sand, gravel and clayish soil, tertiary clay stone and sandstone. The basalt covering the mountaintop generally forms unstable steep cliff, which is the main source of avalanche and rock falling. The avalanche degree of basalt relates to undersurface stratum， that is to say, adverse hillside is easier to produce avalanche and rock falling than bedding hillside. The shape of fallen rock is usually block shape and anomaly ball and its appearing probability is opposite to the volume.

Research conclusions ： The railway route selection in mountain area must follow the technological principle of prevention as the main. More attention should be paid to the subgrade construction and maintenance to reduce the earthquake harms to railway subgrade. The light support structure should be adopted for railway subgrade. The proposal is made the study should be done further on the design theory and the technologies of earthquake - proof, isolating earthquake and ductility design ” etc. should be introduced.

Research conclusions ： Based on the site investigation after the earthquake，it is concluded: (1) The earthquake impact on the geological structure and stratum along the railway line is unobvious. (2) The earthquake impact will not produce the large landslide and mudflow in short period of time，but do impact the existing building very much. (3 ) The sequence - disaster caused by the earthquake makes long - term impact，which can possibly cause mudflow. (4) The rock falling caused by the earthquake is very common，which will make impact on the construction of the railway, so the preventive measures should be taken into account in the design and construction stages. In addition, the proposals are made in this paper for the route election, subgrade engineering and bridge and tunnel constructions for construction of the line.

Research conclusions ； Based on analyzing the role of railway in earthquake relief works and the defects of the southwest China railway network revealed in the earthquake, this paper puts forward following suggestions to the railway network plan ： (1) The railway network plan should coordinate with economic development and satisfy the Disaster Emergency Response Support System requirements. (2) The network flexibility should be improved by strengthening construction of external corridor, enlarging internal network scale and improving rapid passenger and freight network. (3) All modes of transportation should be integrated.

Research conclusions ； (1) Construction of Jiujiang — Jingdezhen — Quzhou Railway is to develop the tourism and mineral resources of the regions along the railway. (2) The main technical standards should meet the needs of the present and future. It is proposed the single line is built at first and the double line will be built later, and the target speed is 160km/h at first and 200 km/h later. (3 ) The railway route should be selected in accordance with the geological conditions, economic conditions, passenger and freight flows and construction investment. It is proposed Jiujiang - Jing-dezhen -Quzhou Railway will be 328. 09 km in length, connecting with Tongling - Jiujiang Railway at existing Hekou Railway, basically parallel to Jiujiang - Jingdezhen Highway, approaching to Jingdezhen and Quzhou stations.

Research conclusions ：This paper utilizes the finite element method to analysis the stability of loess slope, which can consider the vertical joints of loess slope. Compared with limit equilibrium method, the finite element method is much better in analysis of loess slope stability. The calculation example shows that the joint material model in ABAQUS is suitable for loess slope and ABAQUS finite element software applies to the study on stability of loess slope.

Research conclusions ： There are fine relation between the modulus of compressibility and index of the standard penetration test of red clay foundation at Wuhang - Guangzhou Passenger Dedicated Railway, the relative coefficient is bigger than 0. 85. From there relative formula, the modulus of compressibility for the upper strata hard - plastic red clay foundation can be exactly obtained by correcting the modulus of compressibility in geotest indoor through the number of hammer in standard penetration test. In addition，the amount of drilling and sample geotest indoor can be reduced，and such problem as the numerical value on the low side in test indoor by the unqualified sample of commom drilling and sampling measure can be greatly reduced.

Research conclusions: The value from the cone penetration test is approximate to that from loading test. The value from the drill and sampling has a large deviation. The value deviation from the general dynamic penetration will become larger as the depth increases. The coefficients are as follows ： 0. 9 - 1. 1 for the cone penetration; 0. 5 -1. 2 for the drill and sampling ； 0. 6 -1. 0 for the general dynamic penetration.

Research conclusions ： Vacuum - mound preloading is a suitable method for treating soft soil foundation of high - speed railway with the characteristics of low cost, short construction period and making full use of embankment load, etc. The physical - mechanical properties of soft soil are improved much after consolidation with this method. However, when using this method, the attention should be paid to the influence of vacuum-mound preloading on the soft soil around， and to preventing the crack caused by the displacement and additional differential settlement. It is important to choose reasonable design and construction parameters while using this method because of its complex techniques.

Research conclusions ： By means of introduction of technology along with independent innovation and on the basis of absorption and digestion of advanced foreign design concepts，a design method and design system of welded turnout on bridge have been established primarily, which can provides the basis for designing of welded turnout on bridge. The integrated calculation model of M Welded Turnout - Bridge 一 Pier t" presented in this paper can describe action between welded turnout and bridge in truth. This design method of welded turnout on bridge is very feasible and the research results can provide important guidance for the design and construction of welded turnout on bridge for Chinese passenger dedicated line.

Research conclusions ： Application of MATLAB along with AutoCAD in design of non-crossover turnout can define the physical positions of catenary, suspension device and pantograph and make the design figurative, simple and reasonable. With this method, the pantograph can pass through the turnout area safely and smoothly with perfect collecting current at the train speed of 300 km/h.

Research conclusions ： The materials mechanics properties of the prestressed reinforcement and concrete stipulated in In?dian IRC Code are very closed to those stipulated in Chinese IRC Code and the Indian calculation of the pretress loss is almost the same as Chinese calculation. The security of pretressed structure is guaranteed by controlling stress and limi?tation bearing capacity. The requirement of stress stipulated in Indian IRC Code 18 is very high and tensile stress is not allowed，that is to say the partial prestressed concrete design is not allowed. In this case, the structure is more security， but it can not make the design flexible to satisfy the requirements of the different designs and environments because of limiting usage of partial stress.

Research conclusions ： It is proposed to adopt the tendons arrangements in full framing segmental construction when the connector can not be used because the construction site is small. The short tendons are stretched and anchored at the toothed plates and the long tendons are stretched and anchored at the ends of girder. The calculation and control of prestress in prestressed concrete continuous girder should be done according to the theoretical thickness of beam and the construction age，final tension age and the elastic ratio of concrete to counteracted the effect of concrete contraction with tensile stress.

Research conclusions ； The deck arch bridge is suitable for crossing the mountain river and deep valley. Based on studying the design of deck steel tube concrete arch bridge, the following results are offered ： (1) The calculation results of the effect of type section of the arch rib，the crossing incline angle of arch rib，the architecture above the arch，span of the main girder, bearing arrangement method for the pier top and related parameter on the jointless track and dynamics of train，track and bridge； (2) The results of the effect of the span ratio and parameters of the arch axis, erecting method of the steel tube，the sequence of concrete casting in the steel tube on the stress of the arch rib ； (3 ) A new design concept and thoughts.

Research conclusions ； With three bench method, the large - sized construction machines can work rapidly, flexibly and synchronically on many working faces. It is easy to choose suitable three bench method for different geological conditions to satisfy the requirement of construction safety. Of course, there are some disadvantages of three bench method, but these disadvantages can be overcome by controlling the bench length, stabling the arc foot, perfect support in advance and proper drainage. The practices show three bench method is a successful method in reinforcing weak surrounding rock of mountain tunnel of passenger dedicated line and is worth using widely.

Research conclusions ： As a new type of architecture of railway traffic，no-platform-column canopies have many characteristics different from general railway architectures, so there is still room for improvement in its the structure style，design theory and design method through more practice. The difference from general steel structure is that no col-umn bracings are used for no-platform-column canopy，and the structure should be formed by longitudinal and trans?verse rigid frame as much as possible to improve the structured lateral stiffness and enhance the bracings in roof system to improve the whole performance.

Research conclusions ： Through making analyses and comparisons of four schemes for route selection of the transriver tunnel and two schemes for construction of the tunnel, the route selection of transriver tunnel should comprehensively considers the track type, passenger flow and the conditions of building stations and laying out track，and it is proposed to adopt the scheme of Yaoludi. For tunnel construction, it is proposed to adopt shield construction with small section of 6.2 m for single track and tunnel, which can effectively reduce the construction difficulties, guarantee the construction security and lower the construction cost.

Research conclusions ： There are several traditional methods for route maintenance of the solid track bed，such as surface imbruing film, pressure pouring concrete and cut repairing. Through studying the advanced technology for treating the defects, nowadays some new methods, new materials and new technologies, such as low pressure pouring concrete to repair gap，using carbon fiber to reinforce and so on, are used to treat the defect along with traditional method, which make the treatment easy and reliable with lower cost.

Research conclusions ： Ballast bed should be installed for the test track and track outside the depot, which can reduce the vibration and the engineering cost, and the stanchion or adit monolithic track bed should be installed for the track inside the depot according to the different technological requirements so as to maintain easily and reduce maintenance works significantly. Use of flexible fastenings on the track can improve the track safety and stability without any reinforcement and reduce maintenance works. The track can work better by installing the auxiliary equipments，such as crossing and buffer stop.

Research results ： Through the analyses of the engineering and hydrographical geology of the section and different types of TBM，it shows EPB TBM is the most suitable for working in the experimental section of Line 2 of Xi'an metro. Aiming at the spcial geologic condition in loess area, this paper discusses the key technologies of capstan, cutter, screw conveyer, mudding and foam system and propulsion cylinder of TBM and analyses the construction experience for experimental section，which provide references for similar construction in future.

Research conclusions； For construction of national railway and urban mass transit, the design of construction organization should be made in accordance with the local peculiarities and the characteristics of construction. The budget estimate for urban mass transit should be made in accordance with the local quota, policies, laws, regulations and the professional standards. In addition，the method of budget estimate making for urban mass transit should be continuously improved.

Research results ： According to the characteristics of urban mass transit construction and fluctuant property of passenger traffic volume, this paper analyzes the content of the post - assessment of financial benefit and presents a stochastic gray systemic model for the post - assessment of financial benefit. Application of the GM (1,1) model forecasts and fits the passenger traffic volume to obtain passenger flow data as the basic data for the post -assessment of financial benefit so as to research the theory and method for post - assessment of financial benefit of urban mass transit construction. The calculation result shows that the GM (1,1) model can better indicate the change rules of passenger traffic volume with good extrapolating property and precision and can be applied in the post-assessment of financial benefit of urban rail transit construction.