地铁隧道盾构始发过程数值模拟分析研究

Study on Numerical Simulation for Shield Originating on Subway Tunnel

以苏州市吴中区的平行隧道施工为工程依托,利用有限元软件ABAQUS对盾构始发过程进行了仿真模拟,对地表沉降、地层位移、土体应力和围护结构应力进行了对比分析。模拟表明：土体强度对抵抗地层扰动能力具有有效性;土质强度越大,隧道结构在Y轴方向所受的地应力越小,这意味着管片受土压力越小,则隧道结构更为稳定;主动土压力随着盾构掘进深度的增加而增大,且伴随着主动土压力的增加,围护结构应力值也相应增大。

Taking the parallel tunnel construction of Wuzhong district in Suzhou as background,this paper uses finite element software ABAQUS to numerically simulate the shield originating process. A comparative analysis is made on the surface subsidence,stratum displacement,stress of soils and the stress of envelope. The simulation results show that： the validity of soil strength to resist formation disturbance is verified,when the soil strength is greater,the stress of tunnel structure in the Y axis direction is smaller,so does the stress of segment,and thus the tunnel structure is more stable; the active earth pressure increases with the tunneling depth of shield increasing, and accompanied by the increased active earth pressure, the stress of enclosure structure increases accordingly.