Research And Analysis On The Applications Of Double-row Piles Supporting Structure In High Slop Engineering

Currently,the main factor that restrict the development of Yanan is the location of the loess plateau. Narrow ditch and the ridge strewning at random derectly cause the shortage of land for construction purposes, as well as the urban extend to the sides of road. As a result,the security of slope engineering become widesprade concern.Double-row piles, as a kind of new engineering measure, has been used windly in the south regions and coastal areas due to lots of excellent characteristics.But resently,the research of double-row piles supporting structure is behind of the application in engineering, especially in loess areas.According to the research status of double-row pile supporting structure, following work has been done:first, organize and summarize the existing slope stability calculation methods named limit equilibrium method and numerical analysis method, and the finite element method-one of the limit equilibrium method-is applied to the stability analysis of excavation leveling formation of slope in Yanan, for purpose of determining the specific value of slope safety factor; Second, use double row pile supporting structure in the high slop retaining engineering of Majiawan in Yanan. Modeling by finite element program ANSYS10.0 and simulating. We compared the finite element calculation result with the theoretical calculation results.The well fitted result can prove that the double-row pile calculation method is feasible. Finally, some main influencing factors of double-row pile such as the space of rows,stiffness of the joining beam,the length of pile,as well as the reinforce depth of active area,passive area and soil between the tow rows, were analyzed and discussed. At the same time,a series of important conclusion is obtained, which provide the beneficial reference for the application and popularization of double-row pile supporting structure in Yanan and other loess areas.