土压平衡盾构隧道下穿城市景观河道受力特性模拟研究

基于MIDAS GTS有限元软件，建立了盾构-管片-土体一体化模型，对土压平衡盾构隧道下穿城市景观河道受力特性进行数值模拟分析。计算结果表明:由于河道处上覆土厚度骤然减小和盾构机前方的挤土效应，导致河道底部产生了隆起位移，河道顶部产生了沉降；最大土压和最大水浮力均不在河道正下方，而是在河道略前方。

Simulation Research on Stress Characteristics of the EPB Shield Tunnel across the City Landscape Riverway

Based on the finite element software MIDAS GTS, the shield-segment-soil integration model was established, and the earth pressure balance shield tunnel under city landscape riverway was analyzed with numerical simulation. The calculation results showed that as the thickness of covering soil reduced abruptly and there was squeezing effect in front of shield machine, uplift displacement occurred at the river bottom and settlement occurred at the river top; the maximum earth pressure and the maximum buoyancy of water were not just below the riverway but slightly in front of the riverway.