Research conclusions：Through statistic analysis, the means and 95% confidence interval of each parameter are obtained. It is suggest that means should be used in design, except the complex geological conditions, or special sections. The hierarchical cluster analysis indicates the property of red clay can be divided into three parts, namely the structure, strength and status, and the principal component analysis indicates that the values obtained from principal component analysis can be used to assess the possibility of red clay for road.

Research conclusions：The multivariate nonlinear regression equation is established with the foundation of layer-summation method to illustrate the eternal relations among the time, settlement deformation, filling height, elastic modulus, and thickness of the compressed layer. Whats' more, the methods of multiple non-linear regression analysis of the time series data are given, and the applications show the methods can be wide used.

Research conclusions：The research on the exterior -protected construction of foundation pit for Jinyilu Station of Tianjin metro shows SMW pile along with churning jet pile is feasible as the exterior -protected construction of foundation pit and is worth using widely. The H steel used in SMW pile can improve the pile strength and can be used again to save the cos.t However, the piling quality should be guaranteed, especially the pile strength and impermeability, to meet the construction requirements.

Research conclusions：At low temperature, the fracture of rails steel is of typical brittle fracture. Based on the plane stain fracture toughness KIC obtained by experiments, the practical fracture-resisting design method is given. For the common crack of the rails, the upper limit of the allowable crack ac is obtained for providing the basis for the damage detection.

Research conclusions：Through the research on track gauge widening rules of small turnout and comprehensive consideration of the curve geometry, type of blade, gauge at entry of turnout, gauge at toe of blade, gauge in diverging track, etc, the analyses of the reason for structure widening in switch panel are made, the calculation methods for structure widening in any case are put forward, the definition on structure widening is given and a general calculation program for turnout structure widening is developed.

Research conclusions：The construction quality of bridge foundation in karst area can be guaranteed if the survey of karsts is done in details, a reasonable design is made, a scientific construction is conducted and strict inspection is made.

Research conclusions：With application of steel sheet pile as surrounding wall along with the technology for island-filling, it was successful to turn the bored pile and abutment in water were to on land, lower the construction risk, improve the construction environment, speed up the construction process and guarantee the construction quality and normal operation of navigable waterway, which can offer the reference to the similar works.

Research conclusions：Based on the hydro geological conditions of plateau tunnel in cold region, the leakage treatment principle is presented, that is to treat the leakage in combination with environmental protection, to the ground surface water in combination with discharge and dewatering it, to block the water in the tunnel in combination with the draining it and to treat the water thoroughly without future trouble. The tunnel leakage can be treated well by adopting a special chemical grouting along with the unique technology and the aid of bored sampling and non-contact inspection mode.

Research conclusions：(1)The research results and methods of rock damage strength theory may guide the tunnel design and construction, and can be applied in the design concept at macro-level. (2) Improvement of the stress state is helpful for enhancing the bearing capacity of surrounding rock. (3)The bearing capacity of surrounding rock relates to the time function and can be controlled by taking engineering measures. (4)In shallow stratum, the tunnel design load depends on the stress state and damage range of the rock around the tunnel. (5)More attention should be paid to the negative effect of taking the engineering measure on the bearing capacity of surrounding rock while the positive effect is given full play. (6)It is necessary to do the researches on the energy dissipation and release system and the technology for the survey in advance.

Research conclusions：This paper introduces the main technologies used for construction of Yuanliangshan Tunnel on Chongqing-Huaihua Railway Line and gives the measures for improving the technologies to be used for similar tunnel in future. The tunnel structure is a rarely navicular closed syncline with the features of the all karst developments of ordinary karst tunnel. The construction practice shows the integrated geological prediction in advance, filling construction in high-pressure water-rich karst region, environment monitoring and other key technologies play an important role in successful construction of the tunnel.

Research conclusions：Setting the surrounding rocks (grades IV,V) of road tunnel as the study objective, the rocks are simplified as homogeneous medium, puts forward the content, device and method of model tests on the progressive failure mechanism of the surrounding rock of tunnel are offered and the model material of the surrounding rock is confected. The rank of surrounding rock, the cross section and buried depth of tunnel are taken as the parameters for the model test. The test simulation of the failure process of the surrounding rock under gravitational stresses and unsupported condition is carried out successfully. Finally the model test results of the progressive failure process of the surrounding rock, the laws of the stress of surrounding rock and their displacement during the collapse are analyzed.

Research conclusions：Based on the absorption of the foreign advanced technologies, the researches were done on localization of the safeguard system. The improved system can safeguard the person to access into working chamber of TBM by using automatic pressure maintaining system, double airways and double chamber man-chamber with air pressure transfer chamber. Now with all necessary configuration technologies for the safeguard system mastered by us, the air pressure transfer chamber and its safety controlling system with our own intellectual property right shave been developed.

Research conclusions：This paper introduces the characteristics and functions of GEDOCE track detection system, describes the fine -tuning control technology for measuring the slab track in Fenshuiguan Tunnel on Wenzhou to Fuzhou Railway Line, and sums up the way of using GEDOCE detection system to measure and control the geometrical size of slab track for obtaining perfect track regularity and stability.

Research conclusions：Planning concept on the railway transportation hub should be changed from "single -direction, closure and intersection" to "multiple -direction, open and connection". In order to purify the traffic around the station, the different level and different purpose traffics should be separated. For achieving the target of "zero interchange" among the different transportation modes, the modern modes such as establishing multiple-layer and vertical transportation system should be comprehensively adopted.

Research conclusions：The concept of "Traveler Income Level" has been used for the travel mode share prediction mode,l a new travel mode resistance function is defined, and also, a new improved four-stage passenger volume prediction model is presented. Finally, taking Wukesong Station of line 1 of Beijing subway as an example, the peak passenger volume of Wukesong Station is predicted forecast with the method presented in this paper. Through comparison of the predicted volume with actual passenger volume, it is proved that the method is a quick and efficient method for predicting passenger volume.

Research conclusions：With the M/M/N queue theory, the quantities of the alighting passages are estimated and the parameters are effectively calculated macroscopically, including the average queue length and waiting time. With the traffic simulation model built by the VISSIM software, the layout details such as lane assignment are determined. The model supports both two -dimensional and three-dimensional visual evaluation through graphical interface and animation. Moreover, the output data such as average speed and delay are used for quantitative comparison between the different schemes. The estimation also can be made whether the design can meet future traffic demand or not. The application of this method in the new Shenzhen Railway Station demonstrates that this method has the visual and quantitative features.

Research conclusions：Under condition of no ground reinforcement, tunnel construction will effect the structure internal force and produce pier settlement much. After the ground is reinforced, the largest settlement and differential settlement of pier are reduced 38 percent and 44 percent resectively compared with that of no reinforcement. At the same time, the internal force of arch bridge is reduced dramatically. Compared with no reinforcement, structure internal force is decreased 25 percent to 40 percent. The spiral jet pile reinforcement method can ensure the safety of arch bridge in the course of shield tunnel construction.

Research conclusions：Combined with a special subway excavation project, this paper analyzes the guard pile stiffness as support system, support stiffness and embedded depth of guard pile for foundation pit with single-factor analysis based on the simulation analysis. It concludes: (1)The deformation of exterior-protected construction can be reduced and the stability of foundation pit can be enhanced through improving the guard pile stiffness and support stiffness. However, if the stiffness is too much, the axial force becomes big, resulting in the support unstable and damaged and increase of the construction cost. (2)The depth of guard pile should be controlled in the range from 1.2 h to 1.4 h. If the embedded depth is less, the deformation of the pile becomes large, resulting in the foundation pit damage. If the embedded depth is too much, the effect on deformation control is not obvious, resulting in increase of the construction cost. (3) After Optimization of the pile diameter, the deformation control can meet the requirement of ground subsidence and the construction cost can be lowered much under the effect of guard pile with diameter of Φ 800.

Research conclusions：The maximal horizontal displacement of retaining pile is closely related with excavation depth and time. The horizontal displacement of the pile tops is the biggest when the deep foundation pit is excavated to a certain depth and steel brace has not been erected. With excavation of foundation and erection of the steel brace, the location of the biggest horizontal displacement shifts down. With increase of steel brace, the steel axis force decrease, so steel brace can effectively control horizontal displacements of retaining pile and internal force of steel in the pile. In addition, temperature has a certain effect on the axis force of steel brace.

Research conclusions：Taking the connecting aisle construction of bidding 2 of Line 10 of Shanghai metro as an example, the deformation of the ground surface, the expanding and releasing pressures in the soil were monitored on the site and monitored data are analyzed in this paper. The monitored data and analysis results show the deformations can be controlled in the prescribed limit if the parameters of freezing time, expanding pressures are defined rationally and an effective soil pressure balance is established.

Research conclusions：First of all, the project is decompounded on the first level framework, and the superposition of design and construction under the general contracting mode is analyzed from the angel of fast procurement. Then network diagrams under two modes are drawn. After comparing the Diagrams, it is found the project period can be shortened much by combining the design with construction well under the D-B mode. For instance, through calculation, the construction period of one project under D-B mode can be 92 days less than that under DBB mode, which is 15% of total construction period.

Research conclusions：Based on the international and domestic project valuations and the new demands of cost prediction, five methods for cost prediction in quantum are summed up, a program is designed for the cost prediction, and the new thoughts is presented on using the different methods for the projects with different composing elements. The verification shows the cost prediction methods presented in this paper can predict the project cost accurately and timely with a good applicable value.

Research conclusions：The following measures can be taken for control of railway construction cost: (1)The control of construction cost should be strengthened in design stage. (2)The active control of construction cost should be done, and the relation between technology and construction cost should be dealt with well through making economic and technical analyses and evaluations. (3)The life cycle cost of the project should be lowered, and the project investment scale should be controlled strictly to avoid unnecessary waste. (4) The legal person's responsibility system should be implemented. The legal person is responsible for the entire process from the project planning to funds collection, construction operation, paying the debt and value-keeping and value-increasing of assets. (5)The bidding system and supervision system should be implemented well, and the competition system should be introduced in the project management to choose highly qualified construction and supervision enterprises by establishing a set of relative systems. In addition, the contract management should be strengthened.

Research conclusions：When the blasting work is carried out closely adjacent to the infrastructures like the railways, the safety management based on risks does not fit to current construction environment due to its lack of operability on the sites. The contractors are usually the creators of hazards, so the plans of disaster prevention is not only made in the bidding stage, but the most importance is to make it implemented in the construction phases. Only if the clients, the contractors and the owners of the infrastructures jointly undertake the obligation and responsibilities to work out and implement the plan of disaster prevention, can the occurrence of disaster be avoided and quick recovery from the disasters be realized.