Numerical Analysis Of Composite Soil-nailing Of Deep Excavation Dynamic Response Under Moving Load

Recently, with the increasing number of the high-rise buildings and underground structures in the urban, The Deep Foundation also keep ascension. the space of construction was narrow and adjacent to Buildings and roads makes the increasingly high demand for excavation support. At present, the moving loads act to the Foundation pit were considered the static loads in the supporting calculations which can not accurately reflect the dynamic response of the moving loads. Analysis of deformation and stress of foundation pit supporting structure under moving loads were significance. this paper will analysis dynamic response of the pre-stressed composite soil-nailing of deep foundation with FLAC3D, and analysis regularity of soil nail axial force and displacement of excavation under different parameters of soil of foundation pit, pre-stressed composite anchor cable tensioning position, the soil nail axial force and tensioning force. The article will compare the displacements between monitoring and FLAC3D simulation of the real engineering, It turns out that it is not favorable to the foundation pit under moving load. It is of theoretical and practical significance to evaluate the stability of the foundation pit under moving load.The main works are as followings:(1) The finite difference soft ware FLAC3D is applied to analysis dynamic response of pre-stressed composite soil-nailing of deep excavation, the effect regularity of soil nail axial force under moving load, and the difference of soil nail axial force under moving load and static, and the configuration of horizontal displacement and vertical displacement of foundation pit.(2) the simulation of pre-stressed anchor composite soil-nailing with flac3d shows that, the nail axial force and horizontal displacement and vertical settlement are different under moving load when changing the length of the anchoring section and layout of pre-stressed anchor depth and the level of excavation of the pre-stressed value.(3) FLAC3D pre-stressed anchor composite soil-nailing finite element simulation, and found that the configuration of the nail axial force between horizontal displacement and vertical settlement under moving load when changing parameters of soil of foundation pit.(4) The simulation analysis monitoring for the deformation of foundation pit shows useful rusults, It is indicated that it is not favorable to the foundation pit under traffic loads.