Numerical Simulation On HS Model Of Pile-anchor Support Deformation For Deep Foundation Pit

With construction of urban subway project and high-rise buildings,deep foundation pit support project is developing to be deeper and greater.The construction of deep foundation pit often cause large deformation to the surrounding soil.It is very strict to its deformation,because of narrow environment of city and complex,changeable underground environment.The pile-anchor retaining structure can adapt to narrow working surface and effectively control the deformation of the foundation pit,so it is widely used for the deep foundation pit engineering.This paper describes the theory of pile-anchor retaining structure in detail and get the HS soil model parameters by experiment,based on which,we take a deep foundation pit with pile-anchor as an example and deep foundation pit excavation numerical simulation was carried out by using the finite element software.And then we compare the simulation results with the monitoring results.The main contents are as follows:(1)This paper introduces the classification of the deep foundation pit safety level,the support system,the characteristics of the foundation pit deformation,the characteristics of the pile anchor support structure and the design method of the anchor bolt.(2)By analyzing advantages of MC modeling and HS modeling,we choose the HS model to be used for numerical simulation analysis.(3)We use indoor soil test to determine the mechanical parameters of soil.(4)By using finite element software to simulate the excavation process of deep anchor-pile foundation pit,we draw the deformation law of supporting structure and surrounding soil mass.(5)By comparing the results of numerical simulation and monitoring data of pile anchor retaining engineering,we make sure that the HS model parameters and the calculation method is reasonable.