Flow Field Simulation And Stability Analysis Of Retaining Wall With The Drain Pipe Under The Condition Of Rainfall Infiltration

In retaining wall design, often in order to reduce the pore water pressure after retaining wall, design PVC pipes in retaining wall to reduce the water level. But in actual engineering design, rarely considered the Stability analysis of Retaining wall with heavy rainfall especially before river were storage. In this paper, based on the large finite element software ABAQUS as a platform, use drain-pipe simulation theory, established a three-dimensional steady seepage model under the function of the drain-pipe and a three dimensional unsteady seepage model of meeting with once every five years rainfall condition. In the end, analysis of permeability coefficient of the filled soil, diameter of drainage pipe, spacing of drainage pipe, and height of drainage pipe impact on pore water pressure after retaining wall.The main contents are as follows:(1) The theory of three-dimensional seepage finite element analysis are introduced. According to the theory of equivalent permeability coefficient, using Fortran program to calculate equivalent permeability coefficient of the drain pipe. On the basis of these, the steady seepage flow model is established with and without the rainwater pipe.(2) Taking the water pressure distribution of steady seepage before rainfall as the initial condition, analysis of rainfall after the start of the transient pore water pressure of different time. Further, analysis of different influence factors on the wall after the influence of pore water pressure.(3) Analysis and computing the stability of the retaining wall under different working conditions and put forward revision proposals of the retaining wall and drainage design.