Effect Analysis of Isolation Piles outside Foundation Pit on Controlling Lateral Soil Displacement

Currently,it is still controversial whether isolation piles can effectively reduce the deformation of underground structures outside foundation pits.In order to study the effect of isolation piles on lateral soil displacement induced by excavation,a three-stage method is presented to study the soil movement outside isolation piles after excavation by combining the two-stage method and the stratum compensation method,and the rationality of the proposed method is verified.The calculated results show that,under different excavation depths and deformation modes of the foundation pit,lateral soil displacement in a certain depth range under the ground surface can be reduced by the isolation piles,however the horizontal displacement of the deep soil is increased;with the increase of the stiffness of the isolation piles,the isolation effect on the lateral displacement of the top soil becomes more significant,but there are more deep lateral soil displacement;the drag effect to the deep soil due to the isolation piles