Research conclusions:Based on the research，the following conclusions are drawn: (1) The linear relation between void ratio and permeability coefficient of sandy soil in half logarithm coordinate is found．(2) The comparison of the measured and calculated data demonstrates the effectiveness of the model presented in this paper．(3) With the increasing of the pumping depth，the compressibility of sandy soil becomes lager，so it is imperative to use the seepage－deformation coupled model to calculate the subsidence of the pumped ground．

Research conclusions:The experiments show that the roots can enhance soil cohesion c without change of the soil internal friction angle φ and it is similar to the reinforced soil． The roots in the soil can improve the soil scalability．Moreover，the roots of perennial vegetation are good for slope protection．

Research conclusions:The results by testing study showed that the collapsible depth to be eliminated under 15 000 kN·m high energy level dynamic compaction to collapsible loess directly and 15 000 kN·m high energy level dynamic compaction combined with humidification operation was separately up to 10 m，15 m，its strength parameters were nearly 2 times more improvement． A suitable construction process on high energy level dynamic compaction combined with humidification operation in the northwest arid collapsible loess area was probed by this experimental study and it is a reference for similar ground treatment project．

Research conclusions:The rise of the foundation pit，displacement of protected wall，anchor cable engineering，precipitation and untimely support the pits in foundation pit are the major reasons for producing the big settlement and deformation of the surrounding ground． and the anchor cable engineering has the biggest influence． However，the SMW process pile and anchor support system are available for Hangzhou area，but if there is a protected buildings near the pit，the influence of the anchor system should be controlled strictly to reduce the disturbance of the soil and control the deformation．

Research conclusions:In this paper，the analysis of the stability of highway slope is presented to demonstrate the validity of the proposed stochastic response surface method． The results indicate that stochastic response surface method is better than the conventional response surface method in the accuracy and efficiency ，and better than Monte Carlo simulation method in the calculation efficiency ． The stochastic response surface method based on the principle of linearly independent collocation can not only remove the singularity of coefficient matrix associated with the estimation of coefficients in the Hermite polynomial chaos expansion，but also greatly improve the computational efficiency．The Reliability index of the potential landslide increases with the increases of the negative correlation coefficient between cohesion and friction angle，so the results are somewhat conservative if the negative correlation is not considered．

Research conclusions:This analytic calculation method is simple，clear and easy for engineering designers to master．Moreover，the calculation parameters are commonly used in engineering design and easy to gain with the universality of application．With the analytic method presented in this paper，not only can the flexure deformation and load bearing situation of the mid － span slab be found，but also can the load on the pile top be known．The calculation result can reflect the common mechanical regulation of the load sharing and transferring of the pile － slab．Furthermore，it can provide theoretical guidances for theory studies and engineering designs of pile － slab structure．

Research conclusions:From the point view of complexity and science development of our geotechnical high slope，the mechanism should promote analysis of geological processes; emphasize the combination of geology and engineering，the combination of qualitative analysis and quantitative evaluation，the combination of the the system and uncertainty thinking．On the following issues need further research and exploration: (1) quantitative evaluation of the effect of underground drainage; (2) distribution of more than piles of thrust，high cantilever piles and submerged pile; (3) the occurrence and development mechanism of special formation of large landslides; (4) micro － pile structure and method of calculation; (5) prescription anchor secondary stress of the finite element and fill monitoring and construction．

Research conclusions: Rock landslide of steep along the floor is one of landslide types，which with complex mechanism is uncommon，huge．On the basis of the landslide structure survey，the focus of landslide research is to analyze the disturbance factors and to research interaction between the projects and the main structures．It is to minimize landslide hazards of the principal structure．

Research conclusions: Based on research on the reinforcement scheme，the design and construction of the Gesaer Hotel，the following key points of reinforcing and protecting the earthquake ruins are concluded: (1) The in － site investigation and assessment should be conducted in detail and the construction procedure should be arranged reasonably before reinforcing．The engineering of avoiding the building toppling down should be conducted before conducting the reinforcement engineering of the building structure．(2) Based on the latest actual in － site investigation data and knowledge，the reinforcement programme should be adjusted and optimized for guaranteeing the construction security and effectively protecting the ruins．(3) During and after the reinforcement engineering，the monitoring spots should be installed in the major ports of the building，and the security of the building and person can be guaranteed and the reinforcement effect can be known by dynamic monitoring the deformation change．

Research conclusions:This system is better than the imported technology in measuring precision and reliability． By using this system，the work efficiency can be improved much and the cost also can be cut much． Application of it in construction of Beijing － Shanghai High － speed Railway showed by using this system，the comprehensive efficiency of track fine adjustment was increased by 50% ，the cost was cut by 40% ，and the replacement number of the rail fastenings was around 60% of the imported technology，getting obvious economic benefits．

Research conclusions:(1) For the purpose of facilitating regional Traffic and improving road safety，France joined the" Convention on Road Traffic"and " Convention on Road Signs and Signals" which were formulated by United Nations ．(2) Traffic system in Africa road usually adopted the Europe standards．(3) There are some differences between homeland and oversea in traffic engineering system，but it is gradually in line with oversea’s．(4) The construction machine and materials of traffic markings are developed more slowly in our country，there is disparity with the developed countries，and we should accelerate the development step in research area．

Research conclusions:This paper takes an analysis and study into domestically adopted splay saddles，proposed a new type of splay saddle，base － type splay saddle innovatively． It has advantages，simple structure，better function，convenient maintenance access，the disadvantages of existing saddles，such as huge，uneven force condition of anchorage，inconvenient erection and transport

Research conclusions:Under the new situation，resistance statistical parameters of steel railway bridge have been listed．The target reliability indexes of ultimate limit states are calibrated．At the meantime，the partial factors of dead load and live load and resistance are advised，which can meet needs of safety requirements of inheritance in transition from the allowable stress method to limit states design through verification． According to the sensitivity analysis of load and resistance parameters，the statistical parameters of resistance and live load have a large effect on the reliability index，while the parameters of dead load and the ratio of dead load and live load have little effect on it．

Research conclusions:Based on the theoretical analysis and according to the actual production process，the negative factors were overcome by determining the reasonable support location of roller and properly configuring weight equalizer．Based on it，a method to do girth welding of polygonal line tube with submerged－arc welding was found．With this method，the 100% of automatic welding of girth joint in factory workshop can be realized，which is up to 90% of the full－bridge tube girth joint with features of less welding defects，stable welding quality and improving welding efficiency．

Research conclusions:The practice of construction showed the blasting control technology of advanced small pilot tunnel and sequential excavation used for the construction of shallow large span tunnel under － passing the building group was feasible to protect the safety of building group on the ground． The blasting monitored data showed that the largest blasting vibration velocity and main vibration frequency were in the allowable range， and the blasting parameters were reasonable． Application of the triple composite cutting method could improve the blasting efficiency，control the maximum charge per interval，reduce the blasting vibration velocity and benefit the protection of the buildings on the ground．

Research conclusions:The results show that the seepage characteristics is less influencd by grouting circle thickness and permeability under different conditions，and the seepage pressure of surrounding rock mass increases significantly beacause of the blocking the drainage tunnels and the auxiliary holes of the A and B lines during operation period．The results can be as the reference basis for the design and construction of Jinping deep buried tunnel for the second level power station．

Research conclusions:As the Qiyueshan Tunnel cut through the high pressure and enriched water region of the Fault 11，the maximum volume of water inrush and the water pressure during boring stage were up to 1800 m3/h and 3.2 MPa respectively and it brought out the big construction risk． According to the principle of " Taking water blocking as the main factor with the water draining in limitation" ，the mixed slurry of the sulphate aluminium cement single－fluid slurry，common cement single－fluid slurry，and cement and sodium silicate mixed slurry with the rational proportioned parameter of mixing slurries during the construction progress was used for blocking the water in the high water pressure and enriched water area ahead of the working face and the high pressure water was effectively controlled with the water－seal curtain. Meanwhile the crushed surrounding rocks in front were reinforced．It paved the way for the construction safety and the surrounding ecological environment protection and could be as the reference to similar works in the future．

Research conclusions:Based on mixing proportion of indoors theory and combined with the operation and use on the construction site，the mixing proportion of the quasi － mastic slurry that met the technical requirements was decided．The ground monitored data showed the ground settlement could be controlled within 10 mm range after the 3． 75 cubic meters of quasi－mastic slurry and 1.2 cubic meters of double slurrys were grouted and the biggest ground change appeared when the segment was just dragged out from the shield tail． So the synchronous grouting volume should be enough and the secondary grouting could effectively control the settlement in late stage． Basically there was no influence if the settlement of the structures and buildings was in the range from + 4 mm to－16 mm．

Research conclusions:To the tunnel with soft － weak surrounding rock，the step excavation method should be adopted，the preliminary bracing should be conducted as early as possible and the closure to form a loop should be done as early as possible to improve the loading structure of the surrounding rock． The coordination between the design and construction should be strengthened． The displacement during construction should be monitored to know the change regulation of the displacement，so the design parameters can be adjusted dynamically and the time of laying the secondary lining can be adjusted．If necessary，the inverted arch and the secondary lining should be done immediately to ensure the security of the tunnel construction．

Research conclusions:It is feasible to apply the image data of the UAV for check and acceptance of the high － speed railway in environmental protection． Establishment of the system for classification of the image information of the UAV can fetche information as much as possible for the check and acceptance of the railway projects in environment protection，and setting up and working out the image information interpretation data bank and cartographic symbols are helpful for wide application of the system for classification of the image information of UAV．

Research conclusions:The paper puts forward the concept of“the sphere of influence building connecting lines”，“the weighted average of cost classes”and“virtual building cost classes”to complete the method，introduces how to establish the layout of connecting lines in Beijing urban mass transit network in 2010，and elaborates the advantages and disadvantages of the method．

Research conclusions:According to the characteristics of the project management of the construction enterprise，this paper offers the function orientation and applicable target of the project management system of the enterprise and also offers the design outlines necessary for the enterprise daily management of the enterprise to form the advanced project management system of the construction enterprise according to the actual situation of the management works during the construction processes．

Research conclusions:This paper analyses the features of the work and the demand characteristics of the new employees in the railway construction enterprises，discusses the organizational factors and the employee factors which impact the new employee turnover，and then proposes the strategies for new employee retention in the railway construction enterprises by the idea of dynamic process management of psychological contract，which contain that the enterprises should not only be frank，but also focus on employee values in the recruitment process; perform the tutor accountability and broaden the channels for promotion after the entry; pay attention on the material incentives，as well as the feelings and honor incentives．