Research conclusions:(1)In addition to provide transportation services,the more important role of the suburban railway is to support the city population,resource,industry agglomeration and diffusion,guide and support the city layout and structure adjustment,promote city development.(2)Suburban railway emerged and developed before the subway,and the length of suburban railway line accounted for about 90% of the total length of city railways in Tokyo, Paris,London city. ( 3)The suburban railway should as far as possible pass through or into the downtown,linking up the subways. ( 4)The city public transportation system with the rail transit as the backbone lags in our country,and the suburban railway and Intercity railway more lag.(5)In many Chinese city,the planned rail network structure is not reasonable because some single metro line is too long and metro total amout is too large,but the planned suburban railway length is too small.(6)Chinese cities should learn from Paris and other cities of the world with special deference to Tokyo's experience,minimize the weaknesses,of suburban and intercity rail construction.

Research conclusions :(1)Urban rail transit system should be designed based on the connection intension of central city，suburban and exurban，with different levels of rail transit configuration. Developing the suburban railway can improve the rail transit system of large cities. ( 2)The railway which has spare capacity in Beijing railway terminal can be a part of the urban rail transit system，and undertakes the function of urban rail transit.(3)There are three patterns on developing the suburban railway:extending the urban rail transit，taking advantage of existing railway by appropriate transformation to have the function of operating suburban passenger train，newly building suburban railway. ( 4)This research has reference meaning for the construction of large urban rail transit system and carrying out research on undertaking urban rail transit function by taking advantage of lines in existing railway terminal.

Research conclusions :(1)Bi-block ballastless track is recommended for city regional railway after a comprehensive comparison between ballasted track and ballastless track and between different ballastless track types.(2 ) The structure design and construction method of the end beam at the end of track slab are optimized on basis of early research，design， construction and operation experience of bi-block ballastless track applied in high-speed railway，so as to effectively control the concrete crack of continuous track slabs for subgrade and tunnel sections. Thus，bi-block ballastless track with unit track slabs is recommended for subgrade，bridge and tunnel sections of city regional railway.(3)Bi-block ballastless track structure has good reliability，maintainability and economy. ( 4 ) The research results can be applied in the rail design of city regional railway.

Research conclusions:(1)Suburban railway has time distribution characteristics on morning and evening peak and highly holiday traffic，spatial distribution characteristics on unbalanced uplink and downlink traffic density and highly concentrated passenger flow. ( 2)In a special period，suburban railway passenger flow has volatility and randomness. It is suitable for the gray GM(1，1)model to predict passenger flow. In the study on Beijing S2 line，we achieved high prediction accuracies and satisfaction predictions.(3)The paper has a certain reference value for long term forecasting research work of the city 's suburban railway traffic. It also provides a theoretical basis on the suburban railway construction

Research conclusions:(1)Six international transport corridors，four border crossings and"two main and two auxiliary" domestic transport corridor network pattern are built up according to the radial direction of" The Silk Road Economic Belt";(2)Currently，full use of existing facilities，solving customs clearance problems，srengthening the sourcing organization，unified freight rate and the operation of international freight are proposed in order to form channel effect as soon as possible;(3)China-Kyrgyzstan-Uzbekistan Railway，China-Pakistan Railway，Golmud to Korla Railway， Southern Xinjiang Railway Circle Line projects are suggested to be accelerated for an early form of“two main and two auxiliary" corridors in China;(4)Construction of railway junction terminals ( Region ) in Xi’an，Lanzhou，Urumchi and related railway border crossings need to be accelerated;(5)Research results can be used as an important reference for railway project implementation plan，construction timing along "The Silk Road Economic Belt".

Research conclusions:(I)For the on-site complicated environmental conditions，adopt the comprehensive exploration technique to obtain the reliable geological data.(2)After the termination of pumping, karst collapse will still happen intermittently，the existence of such”hysteresis effect”should be paid enough attention to by relative personnel. (3)The operation practice after treatment proves that the investigation and treatment methods adopted in this paper are correct and effective and have significant effect，the research results of this paper provide a good reference for the similar karst subgrade treatment projects.

Research conclusions(1)The ground water level changes greatly along the railway.(2)The complete weathering granite ( granite-gneiss ) stratum has fine physic-mechanical properties along the railway，but the bearing capacity in local area with high content of Montmorillonite or mica reduces due to ground water level rising.(3)The rising water level has little effect on the deep cutting ( within 15 m)，but in short time the height of subgrade fill is restricted to the groundwater level depth. (4)The analysis results in this paper provides some reference for railway subgrade building in the similar surroundings.

Research conclusions:From the experimental study of the granitic regolith and its improved soil，it is concluded that the plastic index decreases with the increasing of the cement:the optimum water content shows little change，however , mechanical properties of granitic regolith are increased with the increasing of the cement. The fully weathered granite and its improved soil can be used for high-speed railway，which provides a reference to the similar engineering, and there is an important theoretical value and engineering practical significance.

Research conclusions:(1)The single-slop is the mostly type of the rocky heap in the projection，anchor pile is the main reinforcement measure of the unstable rocky heaps caused by the subgrade engineering: ( 2 ) There is a layer of low liquid limit clay folder gravel on top of the rocky heap,and lower stone soil folder low liquid limit clay on the bottom，it has obvious layered characteristics，the interface of the soil-rock and the different soil layer are the mostly potential sliding surface:(3)The groundwater is well developed，the drainage of slop and underground water of the rock heaps should be strengthened:(4) The research results can provide references for the similar projects.

Research conclusions: Based on the static load test of Viaduct Pile Foundation，the bearing capacity of post grouting pile and pile with conventional process are analyzed. Measured by the static load test of embedded load box method and the internal force of pile reinforcement stress meter, the bearing properties of the two piles are analyzed comparatively. The results show that the side of two test pile play differences，and the post-grouting technology of spinning drill pile has good effect of reinforcement and improvement on the foundation. The ultimate bearing capacity of single pile is about 2. 8 times that of the conventional process test pile. It can improve the characteristics of the interface between pile and soil，which increase the bearing capacity and decreases the settlement of pile effectively. The post grouting technique is useful for improving the behavior of pile bearing significantly. The research results could be used for the pile selection design guide and construction in the Zhengzhou-Xi an Railway Passenger Dedicated Line，and also for the similar project referencing.

Research conclusions;(1)For twin-cell box girders，there are more shear lag effect models corresponding to its longitudinal symmetric load model，meanwhile there is much difference between different models.(2)In all shear lag effect models，the most prominent model is concentrated force only applied on mid web. Also，this model is affected by the height-span ratio most obviously.(3)Considering the multiple patterns of shear lag effect，in designing of mufti- cell box girder, the influence of different load models of shear lag effect should be considered fully. ( 4 ) The simulation method and results of this paper have some reference value for design and mechanical analysis of mufti-cell box Girders.

Research conclusions:(1)Load of eigenvalue buckling analysis is obtained for upper limit of bridge structure stable limit load.(2)Considering the geometric nonlinearity,material nonlinearity and the initial defects nonlinear stability analysis of the influence of the factors such as load，more in line with the actual situation.(3)The highest pier maximum cantilever construction condition is the most adverse conditions of the high pier construction.(4)The paper can provide the reference for construction monitoring，design and theoretical research of long-span continuous rigid frame bridge with high piers.

Research conclusions:(1)Numerical simulation was adopted to investigate the laws of surface deformation caused by the tunnel shield construction of Beijing subway，the lateral ground settlement curve is basically symmetrical in horizontal direction，and buildings have greater influence on surface deformation on the surrounding area compared with its region. The maximum differential settlement is 8. 09mm.(2)According to the prediction results of numerical simulation，the Bi-directional tunnel excavation affected range of surface is 36m that mainly in tunnel center. The excavation face affected area is 24m in the frontage and 20 m in the rear, so it should be mainly monitored during construction.(3)The practice shows that the measured curves are identical with the simulation curves. The numerical simulation is effective means for predicting the laws of surface and adjacent building deformation caused by shield construction.(4)The research results can be used to make adjacent building deformation control scheme caused by shield construction.

Research conclusions:(1)The over-voltage of seven-span overlapping electrical sectioning device is consistent with the test results of literature，and the residual pressure co-simulation and the theoretical value are about 11 kV，which further prove the effectiveness of the simulation.(2)The maximum overvoltage decreases from 95. 57 kV in the single neutral section of the seven-span overlapping electrical sectioning device to 59. 28 kV in the bilateral neutral passive RC circuit of the eight-span overlapping electrical sectioning device，which suppressive effect is obvious. （3）Experimental results have the important reference value for anchor section joint electrical phase design.

Research conclusions:(1)The initial excavation，pile was forward curve deformation to the pit，with the excavation and support installation，curve of pile gradually to the deformation”)”shape change，the position of maximum horizontal displacement occurred is also down. The maximum displacement of pile body generally appears in the middle part of the pile body 4～10 m range and about 1/3 to 2/3 of deep excavation.(2)During the process of excavation，measured horizontal displacement of ring beam is about 5～10 mm，and it is far less than 30 mm of specification control values. (3)There is still a small amount displacement near the bottom of the pile，the design methods supporting piles embedded solid segment as fixed end need to be improved.(4)Surface subsidence and horizontal displacement size distribution are mutually corresponding, soil around the pit present settlement-uplift-subsidence-uplift-settlement status，the maximum surface settlement located outside pit and approximately 1/3 times the depth of the pit.(5)Using the finite element software ADINA to simulate the process of foundation pit excavation，finite element calculation values are compared with the actual monitoring results，it is found that their values are close，development trends are almost the same，and the results of finite element analysis is reliable and the supporting effect of the pile-strut supporting structure is ideal.(6 ) It can provide a reference for the follow-up design and construction.

Research conclusions:As the water reduction engineering is strong in speciality and obvious in territoriality，the similar experience is very important. There are deeply complex Quaternary loose sediments distributed along Qiantang River, where multilayer thickness of pore confined aquifer is well developed. Strong hydraulic connection is dominated between aquifers，forming a complex aquifer system. Because high pressure water level is existence，it greatly increased the difficulty of dewatering of deep foundation pit. In order to ensure rationality and validity of a dewatering design，the dewatering design must consider engineering geological conditions，hydraulic geological conditions and foundation bracing systems to select reasonable hydrological parameters and make analysis of seepage flow seepage mode. The dewatering should be conducted strictly according to the dewatering design dewatering subsidence and dynamic control to reduce the watering depth of pressure-bearing water for with three-dimensional scheme with immediate effective controlling the around the foundation pit as practice，the method is correct，reliable much and as possible to is a mean ensure the safety of surrounding buildings. to design the dewatering of deep foundation pit ,where deeply complex Quaternary loose sediments exist.

Research conclusions:Based on the structure，construction technology，monitoring，measurement and numerical simulation，we analysis the distribution of stress field and the law of surface settlement in the construction process，and get the following conclusion:(1) The surface and vault settlement caused by unilateral or bilateral excavation is less than the standard , so it is reasonable construction procedure. ( 2 ) We discussed the phenomenon of stress concentration in the process of implementation of two kinds of construction methods，and determined the corresponding location of the maximum stress occurs.(3)It has significant differences on the settlement of tunnel structure which mainly performs in the position of the maximum settlement value occurs. (4)The study found，by contrast，that the construction method has little influence on the change of surface settlement.(5)So the research results can accumulate experience for the city subway construction and provide higher guidance value to the similar projects.

Research conclusions:(1)The station hall public area of fire district should be not more than 2 500 m2，the platform area of semi open type can not be limit:(2 ) The fire lane can be arranged along the long side of the main building in two:(3)The station hall and the platform which can avoid smoke damage place，can be used as security region:(4)A level of power supply of heavy duty escalator, security doors doors and platform ends，can be used as a small staircase evacuation facilities across the line contact channel:(5)The proposal about the rail transport station building fire protection design can be used as fire protection design for future reference station.

Research conclusions:(1)Mobile information system based on 3G technology has the advantages of convenience，ease of use，economy，security，and is suitable for construction enterprise deployment and application;(2)To build enterprise mobile information system architecture framework model，should be user-oriented，open up the process， subdivision business，real-time seamless，security-conscious;(3)The models can be used to design and implement monitoring and visualization of construction safety management，mobile office，digital chemicals and other mobile information applications;(4)Mobile information system also has security and ease of use，technical updates fast， uneven development and other issues，but the idea of mobile information service applications will gradually mature，the application level will continue to deepen.