Research conclusions: Based on the remote sensing mechanism of the alluvial fan，the model for remotely automatic acquiring the integrated alluvial fan information on the lluvial fan，the vegetation index and topographical data is established to rapidly and effectively acquire the alluvial fan information from the sensing images and realize automation of remote sensing interpretation of the alluvial fan．

Research conclusions: The electrical prospecting method is poor in detecting in the hard ground or rugged terrain，so the method of ultra － low combined frequency ground penetrating radar could be substituted for the normal electrical prospecting in this condition，and it could improve the precision and efficiency in the exploration of karst roadbed． The jamming characteristic of different radar echoes under the different site conditions is analyzed and the rational method is found，achieving the good results in the practical application of karst cave exploration．

Research conclusions: This paper get a method to judge the main wind direction through the analysis of dunes form and direction along the railway． On the basis of determining of dunes from and direction we get a conclusion that the main wind blow from slope against wind to another． Take the Taklimakan desert as an example to prove that the method is very useful for building the new railway and protection project against sand and wind． In addition，the wind speed also influent the form of sand dunes，the detailed relationship need the further research．

Research conclusions: It is concluded that for the Sanjiadi seismic landslide in Longnan city，the slowly inclined structure of the loess mudstone interbedding is the internal factors of producing the landslide，its location in the joint zone of two structure is the internal power of producing the landslide，the abnormal development of debris flow is the main external factor of producing the landslide，and the coupling of seismic wave propagation direction with slope body stress field direction，the coupling of the seismic wave with the loess micro － structure and the coupling of seismic wave with groundwater anomalies are the factors of inducing the seismic loess landside． The proposal is made for control of the landslide according to formation mechanism． It has a certain guiding significance to the understanding of the formation mechanism of earthquake，the effective reduction of the secondary disasters induced by earthquake and the promotion of the post － disaster reconstruction work．

Research conclusions: The dynamic test result showed that the chemical improved soil of weathered argillaceous siltstone could be as the filling material of the subgrade of high － speed railway when it had good compression strength and compactness． It is dynamic responses characteristics were similar to the subgrade of A、B groups fillings and fit the dynamic characters of the ballastless track system．

Research conclusions: The paper based on the analysis of the data concludes that the heat fense measure can minish maximum thawed depth under shoulder． The applying of the roadbed new structure can protect permafrost，debase ground temperature and make the roadbed stabilization．

Research conclusions: As a new type of foundation protection structure，it makes the full use of the geological conditions to take the reinforced concrete pile as the vertical support beam，and uses the level bound of the foundation rock on the pile bottom end and the level bound on the periphery beam of the fore shaft on the pile top end to form a stable self －locking support system to avoid making the support system in every steps during the foundation excavation． The plain concrete pile and reinforced concrete pile are nested to form a water － stop curtain to fully stop the water that is not achieved by the boring piles． In this way，the boring cast pile is used as the support structure and at the same time as the water － stop curtain to overcome the problems of the poor waterproof property and low safety，and at the same time it effectively cuts the construction cost．

Research conclusions: The horizontal displacement peak of the pile top and the dynamic strain peak of the pile body increased; with the increase of the acceleration． The maximum dynamic stress of the pile appeared in and under the boundary surface． There was a difference in the vibration direction between the upper and the lower boundary surfaces in vibration process． Under the seismic condition，adding the reinforcement could effectively reduce the dynamic effect of soil on the anchor pile． The pile － type retaining wall structure had a good anti － seismic property and met the anti －seismic design demand of the engineering in the high seismic intensity zone．

Research conclusions: The cause for the anti － slide pile fracture was the manual excavation and blasting when conducting the anti － slide pile to easily make some massifs in the deepest area where was the first to bore unstable and slide because the the places where the piles fractured were of the weak soft layers and their inclination of the fissure surfaces were basically with the that of the inclined slope of massif． Therefore，to avoid the anti － slide pile fracture in the construction，the small diameter (Φ= 20 cm) bore core would be used to form pore time and again and gradually form the rectangle pile pore，and at the same time the intervals anti － slide pile would be conducted． Namely，the second batch of the interval anti － slide pile would be conducted after 28 days that the concrete pouring to the first batch of the interval anti － slide pile was finished．

Research conclusions: ( 1) To reduce the workload of blasting，the form of short piling can be used in the artificial covering layer at bare rock bed． The depth into rock，that is calculated by using“Lalyqin hypothesis”in the short piling condition，can make sure their safety and reliability; ( 2) Because inability to accurately calculate the artificial covering layer for bridge pile and piles of lateral resistance platform，two constraint ways of hinge end and consolidation at the bottom of pile can be used for calculation． The actual results are between their two results; ( 3) If temporary bridge piles and platform piles can’t meet the safety and reliability requirements in an independent state，the connection between the two systems should be increased． The specifications，quantity and location of the connection system need to be analyzed by the overall analysis of system’s strength and stability．

Research conclusions: By using the ANSYS9． 0 program for modeling，the I － level lane load was imposed and the calculation and analysis were made for the nine construction phases． By using the changes of the cross － section deflection，the upper and lower edge stress of the middle cross － section and the upper and lower edge stress of the bearing cross － section，the damage influence of the prestressed strand in hogging moment zone of outside beam on the bridge structure was evaluated． From the calculation it was known there was a little influence of such kind damage on the bridge structure and only some cracks would happen on the concrete protection wall in bearing place．

Research conclusions: Based on the actual geological conditions，the response spectrum method and the direct integration method were used to calculate and compare the response difference of the bridge between using the ordinary basin bearing and using the double spherical isolation bearing． The results showed that using the double spherical isolation bearing could much reduce the horizontal seismic force of the low pier top and meet the requirements of the big displacement of bridge structure within the regional geological fault zone． It provided the basis for optimal design of the bridge substructure，producing good economic and social benefits． This was the first time to apply the double spherical isolation bearing in railway bridge project in the geological fault zone and it would provide the reference to the similar works and provide the technical support to the revisions of the design specifications and standards．

Research conclusions: For construction of the large section IV and Ⅴgrades weak surrounding rock tunnel of the Guiyang － Guangzhou Railway，based on summing up the experience of the traditional three － bench construction method，the three － bench and six short － range method was used in construction to divide the excavation section into three benches and six working faces with synchro － construction on the upper，middle and low benches． With this method，the deficiencies of lots of procedures，long construction period，insufficient turbulence on the surrounding rock in using CRD method and twine sidewall method can be overcome and the construction period can be shortened by machinery construction． The construction practice shows using this method can guarantee the construction security and enhance the construction process．

Research conclusions: It is shown that the effect of different boundary ranges of tunnel on the surrounding stress field and displacement field can be ignored in simulation． It is also suggested that the boundary range of the three times tunnel is used for the numerical simulation and structure design，and it can get good analysis result and safe structure design．

Research conclusions: ( 1) The advanced geological forecast is an effective means of prevention of mud and water bursting，so it must be done in construction． When the mud burst happens，the evaluation must be done for the risk of cleaning silt，otherwise it is dangerous． ( 2) The grouting method was successfully used for treatment of the dyke of the mud and water bursting and for construction of the tunnel in the fault fracture zone safely． The treatment of the fault fracture zone of the tunnel was conducted by taking the technique measures of piling broken stones for protection，circuitous construction and treatment of main tunnel，and it would be as the reference to the similar engineering．

Research conclusions: ( 1) The horizontal churning jet pile was used for the advance reinforcement，and the large pipe roof in advance and CRD method were used for excavation to safeguard the tunnel under － passing the road． ( 2) With the finite element calculation software，the numerical simulation was made for the whole process of the tunnel excavation，the analysis was made for change trends of the stress and displacement of the surrounding rocks during excavation to decide the key points of the construction control and monitoring ground deformation． ( 3) The steel frame needed to be enclosed in time for a loop to prevent appearance of large displacement and floor swell．

Research conclusions: The research shows: ( 1) Taking the active control of the catenary can improve its vibration property． The maximum and minimum vibration values of the catenary can be cut by above 90%，and the mean square deviation can be cut by 70%． Therefore，the system property is much improved． ( 2) The active or semi － active control of the catenary becomes the important way to improve the catenary property when it is difficult to improve the catenary property by changing the catenary parameters．

Research conclusions: Now the LTE technology is an ideal technology for the train － ground wide band wireless communication． It not only can provide the safe and reliable train － ground wide band wireless communication，but also it is of the development trend of the train － ground wide band communication． At the same time，it tallies with the gradual tactics and procedure from the GSM － R to LTE － R defined by the International Union of Railways．

Research conclusions: According to the key points and difficult points in design of the pile foundation underpinning project，the relative measures should be taken and the works of informatization management and the system control should be well done to guarantee the smooth implementation of the pile foundation underpinning and bridge structure safety．

Research conclusions: Application of the churning jet pile outside the shaft makes the ground water and water bursting from the fissures going out from the outside of the water curtain of the churning jet pile． At the same time，by taking the measures of the grouting reinforcement in the shaf，the precipitation in shafts，the partial excavation，the grouting down outside shafts by the flower arrangement tubes，the back cover of concrete bottom of the shaft，the drainage of groundwater in advance and the precipitation inside the tunnel，the problems of the water bursting in construction of the shaft and tunnel in the water － enrich coarse strata of loess areas are overcome．

Research conclusions: The analysis and study were done on the observation information of nine observation points along the Xi'an subway． The study results showed that the constant temperature strata position of the Zaohe first terrace was in the 10 meters under the ground surface with the temperature of 15 ℃，the constant temperature strata position of the loess ridge was in the 9 m under the ground surface with the temperature of 17 ～ 18 ℃，the constant temperature strata position of Weihe first terrace was in 10 meters under the ground surface with the temperature of 15． 5 ℃，and the constant temperature strata position of Weihe third terrace was in 9 meters under the ground surface with the temperature of the 16． 5 ℃．

Research conclusions: ( 1) By using double － deck design，the land area occupied by the depot is cut by 35%，saving lots of land． ( 2) As the development area of the bare land increases in the double － deck design，the whole plot ratio of the property development increases． The business profit of the double － deck is 2 times of the single － deck． ( 3) The concept of construction and property development of the Henggang double － deck vehicle depot project has high applied value．

Research conclusions: ( 1) The design should be incorporated into the core part of project management． The group or project manage department should hire sufficient experts for direct management，while the design institute should open the mind and coordinate with the construction units to realize the integration of design and construction． ( 2) The design guidelines should be reflected from in accordance with the contract and benefits． The design standards，materials，technologies，design proposals of each discipline etc． ，should be evaluated s to maximize the benefits of the contractor．( 3) The general contractor should manage the design resources，arouse the enthusiasm of designers and mobilize them to play the role of external surveillance，so that they can cooperate closely on the design in accordance with the goal of contractor．