盾尾偏移围岩变形计算机仿真技术研究

盾构法隧道施工已在城市地铁建设中特别是在软土地层中被广泛采用,但常发生的问题就是周围岩层不均匀性等原因引起的盾构偏移即蛇形运动,从而导致周围地层的不均匀变形.特别是地表的不均匀沉降,直接影响到地面建筑和附近地下设施的正常使用.本文采用国际常用的离散单元法对盾构偏移引起的周围地层的变形与破坏,以及地表沉陷进行探讨.其节理单元用束模拟盾壳与地层的接触.

The simulation technology research for Shield tail offset deformation calculation

The shield tunnel construction in urban subway construction,especially in soft soil layers are widely used,but often the problem is shield uneven deformation around the rock that is snake-like movement,and lead to the uneven formation around the surrounding strata,in particular the uneven surface settlement always directly impacts the normal use of facilities on the ground and underground.This paper investigates the deformation and failure of surrounding strata and surface settlement induced by shield tail non-uniform movement using Discrete Element Method.Its joint element is used to simulate the interaction between the shield and strata.