盾构施工中地表沉降的数值仿真及影响分析  

Numerical Simulation on Ground Settlement During Shield Tunneling and Impact Analysis

作　　者：秦弦[1] 杨培中[1] 刘涛[1] 金先龙[1] 

机构地区：[1]上海交通大学机械与动力工程学院,上海200240

出　　处：《计算机仿真》2011年第1期369-373,387,共6页Computer Simulation

基　　金：国家自然基金上海市信息化专项资金项目(90612017)

摘　　要：研究隧道施工地表沉降量需有精确估算。为了减少盾构机隧道挖掘所引起的地表沉降,利用FEPG系统,结合盾构法施工的实际过程,综合考虑了开挖面泥水压力、应力释放、注浆力学性质变化、盾构机身坡度、注浆压力等要素,建立了三维非线性有限元模型,对上海崇明越江隧道特大泥水盾构施工进行了数值仿真。仿真计算所得的地表沉降量结果与施工现场测得的实际地表沉降量较为吻合,表明仿真方法的有效性,并对数值仿真影响地表沉降的主要因素进行了分析。从结果分析上看,施工中合理地增大开挖面泥水压力、注浆压力可以有效减小地表沉降。To decrease the ground settlement caused by shield tunneling, a 3D nonlinear finite element model is presented to simulate Chongming river-crossing shield tunneling in Shanghai. The simulation is based on Finite Ele- ment Program Generator （ FEPG ） system and takes into account all relevant components of construction process,such as the slurry pressure at the excavation face, the release of stress, the time dependence of the grout material charac- teristics, taper of shield skin and grout pressure, according to the practical process of the tunneling. The ground set- tlement by numerical simulation is validated by the comparison with field measurements, which shows the rationality of this simulation method. On this basis, the irffluenee of main factors causing ground settlement is studied through numerical simulation. From impact analysis, the settlement can be effectively decreased by the reasonable increase of the slurry pressure at the excavation face and the grout pressure.

关 键 词：盾构法施工 数值仿真 地表沉降 影响分析 

分 类 号：TB115[理学—数学]