关键词: 矩形顶管, 顶管工作井, 顶推反力墙稳定性, 数值模拟, 监测

Abstract: In this paper, a dynamic threedimensional finite element analysis model for the stability of the reaction wall during pipe jacking is established, so as to analyze the influence of the jacking reaction load on the displacement, stress and pore water pressure of the soil behind the wall and that of soil elastic modulus, solid thickness and solid depth on the horizontal displacement of soil behind the wall. The results show that: (1) The reaction load only affects the corresponding part of the soil area, and the horizontal displacement of the soil around the reaction load area varies greatly. (2) Except for a large subsidence of ground right above reaction wall, the other areas show uplifts with parallel wave shape. (3) The reaction load only changes the type of earth pressure behind the wall, and does not change the distribution of earth pressure. (4) The jacking reaction load affects the soil pore pressure little. (5) The depth of the combined force point of the reverse jacking force and the elastic modulus of the soil have a greater effect on the lateral displacement of the soil. (6) The solid depth and thickness affect the lateral displacement of soil little.

Key words: rectangular pipe jacking, jacking shaft, jacking reaction wall stability, numerical simulation, monitoring