盾构开挖冻结法加固隧道的地表沉降对比分析

Comparative analysis on surface settlement of the frozen reinforced tunnel with shield excavation

针对盾构法开挖掘进隧道引起的地表沉降问题,以上海14号线隧道上行线盾构隧道建设工程(武定路—静安寺区间)为背景,基于Peck经典沉降公式计算出地表沉降曲线,结合ANSYS有限元软件数值模拟盾构隧道的循环开挖,分别研究在未冻结加固土体和冻结加固土体条件下的地表沉降规律,并对解析计算、数值模拟和工程监测数据进行了对比分析,得出了三种地表沉降曲线变化规律一致的结论,并验证了冻结法加固土体减小沉降的有效性和数值模拟软件的可行性。

Aiming at the problem of surface settlement caused by the tunneling with shield tunneling method,the shield tunnel construction project(the section from Wuding road to Jing’an temple)of Shanghai Line 14 is used as the background.Based on Peck classic settlement formula to calculate the ground surface settlement curve,and combined with finite element software ANSYS numerical simulation,the cycle excavation of shield tunnel is simulated and the surface settlement rule with the freezing method to reinforce the soil or without the condition is studied.The analytic calculation,numerical simulation and engineering monitoring data are contrasted.The results show that the three kinds of ground surface settlement curves have the consistent law,and the effectiveness of the method to reduce the settlement with frozen method and the feasibility with the numerical simulation software are verified.