Research conclusions：From the statistical analysis and study on the measured bearing capacity of the soft subgrade of Suinning-Chongqing Railway, it is concluded that the reinforcement and design of general flexible foundation, such as embankment and field plateau, should consider the three aspects, namely embankment stability, post- construction settlement and subgrade bearing capacity, and the allowable bearing capacity value of flexible foundation can be in properly wider range under the premise of meeting the requirements of stability and post-construction settlement. The checking formula and the suggestions to correction coefficient of bearing capacity of flexible foundation are also given preliminarily.

Research conclusions：Under extremely difficult natural geographic condition, using the satellite D-InSAR technology to monitor the subsidence of the subgrade in permafrost region is essential to improve the working condition, enhancing the monitoring efficiency, reducing the monitoring cost and manualm on itoring work in difficult area as much as possible and to the construction of the long-term monitoring system for the infrastructure in permafrost region. Using the unique, continuous subsidence information of point, profile and surface obtained from the satellite D-InSAR can analyze the spatial characteristics and regulation of the subgrade deformation in permafrost region from the angles o f points, profiles and surface in the wide range and can help obtain the new discovery or new know ledge about subgrade subsidence in permafrost region through the analysis from the spatial angle. These can provide the new basis for evaluation of the stability of the subgrade in permafrost region and open the new thought on further researching the engineering deformation in permafrost region.

Research conclusions：From the study , it is concluded the main control factors of the failure damage of slope anchor structure include water in fluence, unfavorable geological condition influence, vibration influence, special deformation in fluence and engineering quality influence. The engineering quality influence is the most important factor to influence the failure damage of the slope anchor structure happening or not. The failure damage types of slope prestressed anchor structure include six types, e.g. the insufficient bearing capacity of the main body of the anchor, the load on the anchor exceeding the limitation, the insufficient strength of counterforce structure, corrupt damage, disaster damage and comprehensive damage.

Research conclusions：The rock soil parameters influencing the convergence of the verticalm easuring line in order from big to small are deformation modulus, the poisson's ratio, the internal friction and the cohesive strength, but for the horizontal measuring lines are the poissons' ratio, the modulus, the internal friction and the cohesive strength.

Research conclusions：The cylindrical pile bears the most load of the composite subgrade of thin-wall cylindrical pile and its stressing is mainly from side frictional force. After the cover plate is added to the cylindrical pile, the cylindrical pile can give full play to bearing load. The stressing of soil around cylindrical pile is related to the effective area, and its stress ratio increases with the increase of the load. Application of thin wall cylindrical pile can prevent the soft foundation from lateral distortion by compacting earth. As the anti-horizontal capacity of cylindrical pile’s composite subgrade is good and the anti-side slipping capacity is perfect, the embankment area of high road is good at anti-sliding. The piling quality of the thin-wall cylindrical pile is stable, the single pile’s bearing capacity is good, and the composite foundation has a good bearing capacity of complex piles foundation. The distortion of cylindrical pile is less, especially the post-construction subsidence is small. The strength and rigidity of the reinforced soft foundation are much improved.

Research conclusions：During treating the soft subgrade with vacuum-heaped load preloading, it is necessary to follow the principle of guaranteeing good permeability of drainage system and air tightness of vacuum system, and control the construction quality of sand bedding, plastic drainage board, pipe network, sealing membrane, sealing grove and vacuum pump. From verification, it is found the calculated results with the commonly used "equivalent load methods" are different from the actualmeasured results to some extent, and from the analysis, it is thought the main reasons for the differences between the calculated results and the actually measured results are the vertically transferred depth of the vacuum degree and the lateral deformation of soil were not considered. How to accurately consider these two factors needs to be further discussed.

Research conclusions：Through the research on the method for application of long spiral pump pressure CFG pile in reinforcing soft soil subgrade, the construction technique, construction flow and the key points forcaution in construction were put forward, the technical problems probably happened in construction were analyzed and the controlmeasures probably to be takenwere given. The practice showed application of thismethod could achieve a good resultand it could be as the reference to the similar works.

Research conclusions：Based on analyzing the tested data and the result of theoretical analysis, it is concluded the attention should be paid to the effects of coupling bending-torsion on curved flat arch bridge and the flat arch bridge with larger curve radius can be analyzed by setting up plane finite elementmodel as long asmore attention is paid to the selection of some critical parameters.

Research conclusions：From the observation of the settlement of Yunliang Grand Bridge of Harb in-Dalian Passenger Dedicated Line, and the analysis and evaluation of the settlement observed data, it is concluded by using curve fitting of the curve analysis method that the fitting result of double curves conforms to the real situation of Yunliang Grand Bridge, the stainless steel spiral observation mark should be used and four observation marks should be separately installed on four corners on both sides of the bridge pier, and the repeated observation should be conducted to the benchm ark (at least one CPI point or one CPII point) at fixed time by the same device and same method for improving the settlement observation accuracy.

Research conclusions：In the paper, combined with the subsurface excavation of a little spacing group tunnels at Xuanwumen Station, the stress concentration is analyzed on the basis of monitored and measured data, the stress strain effects of the soil mass between two tunnels during the construction of a little spacing tunnel is quantified, and the settlement regulation of the soilmass and the change characteristics of soil pressure are also analyzed. The results show (1) The settlement at the center of soilmass between two tunnels is up to-14. 8mm, being 1.1~2 times of other areas. The relation between soil settlement and soil pressure is identical with the theoretical analysis. This shows the obvious stress concentration happens at this place. (2) The subsequent tunnel slightly affects the previous tunnel in tension. At the same time, according to the distance between working face and monitoring site, the stages of earth settlement and earth pressure are divided to provide the basis for taking measures for reducing the stress concentration.

Research conclusions：After excavation of the blind tunnel, large tensile stress happened to the surrounding rock on the right side of the foundation bottom of the ear wall to form a arc sliding zone. In construction, the foundation bottom of the ear wall was reinforced by anchor and grouting. Large tensile stress happened to the 8.5 m high area on the outside of the ear wall, but was smaller than the tensile design value of the concrete. The actual measurement showed the level disp lacement of the ear wall was small and the strength and stability of the ear wall were in the safe range. The stressing of the support structure for the blind tunnel was small and the stress of the secondary lining changed a little after completion of construction. All these showed the reinforcement of the side slope on left side before construction obtainedgood effect and verified the design and construction of this tunnel were reasonable and could be as the reference to the similar works.

Research conclusions：Taking monitoring construction of large section loess tunnels of Zhengzhou - Xi’an Passenger Dedicated Line as the background, through the in - situ test and the statistic analyses of the measured data of the 10 tunnels, the conventional method was compared with the non - contact measuring method. After comparing code limit values with the measured data, the monitoring items, monitoring way, monitoring method methods and the control reference values are offered for monitoring construction of large section loess tunnel of passenger dedicated line with using many construction methods together.

Research conclusions：Through comparison, it is determined to conduct the measurement jointly with lead - hammer meter and gyro. The measuring principle and procedure of this method are described. The directional measuring number of gyro is at lease not less than three times. Before doing so, the ground control net should be measured closely and at the same time one known side on ground should be chosen to measure the position angle between it and gyro. This position angle should be compared with the inversely calculated position angle and its measurement accuracy should be verified. The measurement result after the through connection of the line shows the measurement accuracy can meet the requirement of large section tunnel construction of passenger dedicated line.

Research conclusions：The models for prediction of possibility grade of happening tunnel leakage disaster and evaluation of tunnel leakage disaster grade in tunnel operation period are established with all kinds of stochastic mathematical methods, and the applied research on these models are done. The results show that the grades of tunnel leakage predicted by Mahalanobis distance method and evaluated by BP neural network and Fuzzy comprehensive evaluation methods are consistent with the evaluation with from the field measured data.

Research conclusions：The practices of 9 whirligigs to the parallel pilot tunnel and the 5 whirligigs to the main tunnel show the good result of water blocking with the amount of water seeping of 4.9 L/m per minute is achieved by adopting the single liquid slurry of Portland cement and double liquid slurry of Portland cement and water-glass to block the high pressure cranny water. If the tunnel section is not big ( e.g. the parallel pilot tunnel), the surrounding grouting can be adopted for blocking water and the water blocking range covers 3-5 meters outside of the tunnel. If the tunnel section is big ( e.g. the main tunnel), the water blocking range covers 5-8 moutside of the tunnel.

Research conclusions：TSP 203 can accurately predict the nature, location and scale of the rock body in the area of 100-150 m ahead of the tunnel, especially the unfavorable geology, such as karst caves, fault zone and fracture zone. Application of TSP 203 in tunnel construction can reduce the blindness in tunnel construction, effectively prevent the appearances of the unfavorable geological disaster and construction accidents, and speed up the construction progress.

Research conclusions：The correct theory should be used to guide the innovation of the blasting technology, the advanced equipments and technologies should be introduced to support the development of the blasting technology in future, and the standards and codes should be worked out, verified and improved to push forward the application of the blasting technology. This paper also gives suggestions on the development of the smooth (presplitting) blasting technology.

Research conclusions：From the tests and analyses of the blasting vibration in construction of 25m buried deep Kaiyuansi Tunnel and the diversion tunnel in Hangzhou with bore blasting method, it is found the ground vibration caused by undermine blasting is the most serious. The experiment shows application of multi-stage wedge undermine can reduce the blasting vibration effectively, and application of high-precise delay blasting cap or digital electric blasting cap to adjust the time difference of the undermine blasting can reduce the vibration of vibration wave by alternating peak, improve the undermine effect and utilization rate of the hole. Based on the monitoring the blasting vibration during the blasting experiment, the undermine blasting plan is continuously improved and optimized to achieve the goal of passing through the shallow buried sensitive area of the tunnel with about 3m boring of each blasting and the ground blasting vibration of 1.5-2.5 cm/s. In this case, the rapid construction with bore blasting method is realized.

Research conclusions：According to the environmental and geological conditions, the low going and small boring diameter bench loose blasting, blasting for pre-crack of side slope and movable track panel were adopted for blasting stone for expanding the road cutting of Guiyang-Guilin Railway, and based on the test and analysis of the blasting effect, the suitable blasting parameters for the local condition, safety management method and protective measure for safety are put forward. With these technologies and measures , the blasting operation is completed rapidly for blasting stones for expanding the road cutting of Guiyang-Guilin Railway, obtaining the level and stable side slope of the road cutting, good blasting effect and perfect economic and environmental benefits .

Research conclusions：The advanced forecast, blasting control, monitoring and measurement are essential to the construction of vertical and cross tunnel, and they are supplementary to each other and not one of them can be dispensed with. To construction of vertical and cross tunnel, the blasting control is key point and the advanced forecast, monitoring and measurement are also important. Only when the real geological condition of the working face is well known through the advanced forecast and the change o f the ground subsidence is well known through them on itored and measured data can the most reasonable and effective blasting control parameters be worked out, the potential risk be eliminated and the smooth construction of vertical and cross tunnel be ensured.

Research conclusions：The multi-leg structure of the machine can meet the need of many kinds of variable-mutual girder with easy switching operation and high construction efficiency. The gantries' operation mode of synchronous lifting girder can reduce the occupation time to the girder carrier and improve the girder carrying efficiency. The big lateral moving beam of the gantry meets the requirement of lowering girder without moving the girder by pier and reduces the labor strength. The machine vertically moves on the rail with stable moving. The application verifies this machine has reasonable structure with high efficiency of erecting girder and can solve the difficult problems in erection of multi-box girder successfully.

Research conclusions：In this paper, the discussion is made on the resource sharing in the fields of vehicles, vehicle depots and the National Railway’s participation of urban rail transit, and resource sharing method is proposed in terms of constructing station and depot together, sharing forms of vehicles and their maintenance. Through adoption of same sytle vehicle, accessories, interfaces and technology for obtaining the consistency or compatibility, the max resource sharing can be achieved. In addition, taking Chongqing as an example, it proposes to use some parts of the national railway as some parts of urban mass transit in order to achieve the resource sharing and save construction cost.

Research conclusions：(1) The construction management system of general contracting design and construction is adopted in most of the African highway projects. (2) The European standards system is usually adopted in design of African highway projects with more detailed design stages. (3) The design mode for African highway more closely combined with the construction, with more detailed design content and more nitty-gritty design flow than China. (4) The design under condition of design and construction integration should consider all the factors of the construction condition and construction program and it is essential to the benefits maximization.

Research conclusions：Aiming at the current situation and problems in implement of ISO 9000, this paper analyses the practice of the quality management of the engineering design with ISO 9000, puts forward the concrete ways of how to bring ISO 9000 into line with the design planning and how to apply it widely in the quality assessment and networking management, and points out the manager should make effects on enhancing the availability of planning engineering design with ISO 9000 and work out the relevant management measures from the user and real situation points of view to satisfy the requirement of ISO 9000 for improving the enterp rise’s management level and the qualities of the design and construction.

Research conclusions：This system builds an informationized management platform for assessing the qualification for professional and technical post, sets up a quantitative standard data bank of assessment condition for the qualification for professional and technical post, and makes the assessment work standardized, sequenced, intellectualized, networking and electronized. With this system, the management of technical person of can be controlled optimally and analyzed strategically for providing the support to the enterprise management and decision-making.