考虑注浆作用的盾构隧道施工环境影响分析

为分析盾构隧道施工过程中的注浆过程对周边环境的影响,文章利用FLAC3D有限元软件建立数值模型,通过设置孔压模拟注浆对地层的作用,采用流固耦合的数值方法模拟施工过程引起的地层变形。通过与实际工程对比,验证该方法的准确性,进一步分析盾构施工中注浆压力、临空时间对地表最大沉降的影响规律。结果表明:注浆压力越大,地表最大沉降越小,选用注浆压力为1.10倍上覆土重作用压力为最佳;临空时间越长,地表最大沉降越大。

In order to analyze the influence of grouting process on the surrounding environment during shield tunnel construction, a numerical model was established by using FLAC3D finite element software. The effect of grouting on strata was simulated by setting pore pressure, and the strata deformation caused by construction process was simulated by fluid-structure coupling numerical method. By comparing with the actual project, the accuracy of the proposed method was verified, and the influence law of grouting pressure and air time on the maximum surface settlement in shield construction was further analyzed. The results show that the greater the grouting pressure, the smaller the maximum surface settlement, and the best choice is 1.10 times the pressure induced by overlying soil weight. The longer the air time, the greater the maximum surface settlement.