盾构隧道施工对地表沉降影响研究

Study on the influence of shield tunnel construction on surface settlement

以某盾构隧道开挖为研究对象,首先对现场地表沉降数据进行了介绍,然后采用PLAXIS建立数值模型,对典型的3个断面的监测和数值数据进行了对比分析,得到结论:盾构开挖离监测面越近,隧道上部土体发生沉降越大,当盾构机继续向前时,监测面地表沉降仍会继续增大,直至最终趋于稳定;3个断面的数值模拟地表沉降值均与现场实测值误差均不超过5%,说明数值模拟结果的合理性。

Taking the shield tunnel excavation in a certain place as the research object,this paper firstly introduces the field surface settlement data,and then uses PLAXIS to establish a numerical model to compare and analyze the monitoring and numerical data of three typical sections.The following conclusions are obtained:the closer the shield excavation is to the monitoring surface,the greater the settlement of the upper soil mass of the tunnel,and when the shield machine continues to move forward,the surface settlement of the monitoring surface will be increased.The results show that the numerical simulation results are reasonable.