上软下硬地层盾构隧道开挖面稳定性数值模拟研究

Numerical Simulation Research on Stability of Shield Tunnel Excavation Face in Upper-soft and Lower-hard Stratum

摘要:

利用Abaqus有限元软件，对上软下硬地层的盾构开挖过程进行模拟，通过计算分析不同工况下的支护应力比和开挖面最大水平位移之间的关系，得出上软下硬地层隧道施工的安全盾构推力范围。结果表明：开挖面最大水平位移随支护应力比的减小而增大，数值模拟得出的最小支护力变化规律同实测值相一致，且盾构推力的安全参数范围为4.9~6.8。

Abstract:

The finite element software Abaqus is used to simulate the shield excavation process of the upper-soft and lower-hard stratum. By calculating and analyzing the relationship between the supporting force ratio and the maximum horizontal displacement of the excavation face under the different working conditions, the safe shield thrust range in the construction of the tunnel in the upper-soft and lower-hard stratum is obtained. The results show that the maximum horizontal displacement of the excavation face increases with the decrease of supporting force ratio. The change law of the minimum supporting force obtained by the numerical simulation is consistent with the measured value, and the safe parameter range of the shield thrust is 4.9~6.8.