Study On The Interaction Between Building Pile Foundation And Slope In The Mountains

In Chongqing and other mountain cities,bulidings are often constructed near slope crest.In this case,the interaction between piles and slope can't be ignored.In this paper, static and dynamic analysis are carried out to investigate the pile-slope interaction of piles in a cut slope by using finite element software Ansys. The main contents are as follows:the influence of building piles on soil slope and rock slope under static and dynamic loading; the influence of slope deformation on the internal force of piles;the effects of pile-slope isolation measures.Based on the above work,the main conclusions are as follows:(1)When the slope is not in the limited state under gravity load,the pile would increase the lateral soil and rock pressure.(2)When the slope is in the limited state under gravity load and the end of piles are below the bottom of reitaining wall,piles could transfer load to sTable soil and have little impact on soil pressure of retaining wall. On the other hand,building piles located in slope slip surface are subjected to landslide thrust.The internal force of piles are similar to that of anti-slide pile.(3)When the rock slope with out-dip structural plane is in the limited state under gravity load, the buliding pile performs as anti-slide pile and increase the slope stability.But the internal force of pile increase greatly, bending moment and shear force are large, the reinforcement of pile should be strengthened. If the rock slope without out-dip structural plane is supported by bolt,bolt design should consider the influence of building pile foundation. If the rock slope without out-dip structural plane is supported by retaining wall,retaining design could not consider the influence of building pile foundation.(4)Building pile foundation located in rock slope with out-dip structural plane could transfer additional soil pressure to the retaining wall.The shape of additional soil pressure is inverted triangle. The buliding pile acrossed out-dip structural plane in rock slope performs as anti-slide pile under dynamic action,so the tensile forces of bolts are smaller than that of the model without buliding pile. The rock slope without out-dip structural plane is relatively sTable.The deformation of slope is small and the interaction between building pile foundation and slope is not obvious.(5)Due to the positive effect of the building pile as anti-slide pile and the vertical pile friction force transfered to the sliding body is not big, the effect of linoleum isolation is not ideal.Sleeve isolation reduces the internal force of pile.