基于土舱压力波动的盾构隧道开挖数值模拟

Numerical Simulation of Shield Tunnel Excavation Based on Pressure Fluctuation of Soil Chamber

现有的盾构隧道开挖模拟,都是将掌子面上的土舱压力设定为定值。事实上,隧道掌子面上的土舱压力时刻在变。结合北京轨道交通L8盾构隧道开挖的工程实例,基于Box-Muller方法,将均匀分布随机数变换为正态分布随机数,并将其作为波动的土舱压力施加在数值模型上,以分析波动的土舱压力对盾构施工引起地表沉降的影响。

The existing simulation of shield tunnel excavation is to set the earth chamber pressure on the face of the tunnel face as a fixed value.In fact,the earth chamber pressure on the face of the tunnel face is changing always.Combined with the engineering example of L8shield tunnel excavation in Beijing Rail Transit,based on Box-Muller method,the uniformly distributed random number is transformed into the normal distributed random number,which is applied to the numerical model as fluctuating cabin pressure to analyze the influence of fluctuating cabin pressure on the ground settlement caused by shield construction.