Deformation Analysis of the Pile-anchor Retaining Structure Based on FLAC~(3D)

Based on a deep foundation pit in Zhengzhou,the geological conditions of the engineering site and support structure design were introduced. Meanwhile the monitoring data of the supporting structure deformation for the foundation pit were analyzed,and the developing law of the deep horizontal displacement that changed with the depth and duration of in the process of construction was emphatically studied. The and supporting of the pile-anchor supporting section in the north of foundation pit were simulated by adopting the finite difference software FLAC3 D,through which the lateral displacement of foundation pit during was calculated,and then compared with the monitoring data. In addition,the design of the supporting structure was altered to search for the sensitivity factors that caused the deformation. The results indicate that pile-anchor supporting system can effectively protect the supporting system from deformation if the rule of excavation and protection should be simultaneousduring the construction of the foundation pit is carried out strictly,the results of numerical simulation by FLAC3 Dare basically the same with the monitoring data,thus the simulation results of the former can be trusted; the magnitude of the anchor cable prestress plays an important role at preventing the lateral displacement of the supporting structure; the reasonable embedded depth of the supporting piles can also mitigate lateral deformation of foundation pits.