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如何对盾构施工过程中的孔压监测数据进行实时分析是工程实践中的难点问题。结合上海虹桥迎宾三路隧道工程,首先建立了包括各种盾构施工参数影响的分析模型,并将不同施工参数情况下超孔压计算结果与实测值进行了对比,验证了模型的合理性。之后分析了开挖面推力、注浆压力、掘进速度、开挖面水头、隧道埋深以及土体渗透系数等参数对隧道周围最大超孔压的影响,获得了最大超孔压拟合计算公式,与现场实测和解析解的对比说明三维流固耦合计算可更合理分析盾构施工对孔压的扰动。同时,较大的超孔压值对应于较大的地表沉降,因此可将实测孔压值与数值计算结果进行对比,从而进行施工参数的调整。在上海虹桥迎宾三路隧道工程试验段的施工过程中,现场监测数据表明可根据孔压监测值调整施工参数,最终减小地面沉降。
How to analyze the pore pressure monitoring data in the process of shield construction in real time is a difficult problem in engineering practice. Combining with the Yingbin No.3 tunnel project of Shanghai Hongqiao, the analytical model including the influence of various shield construction parameters was first established. The calculated results of excess pore pressure under different construction parameters were compared with the measured values to verify the rationality of the model . After that, the influences of excavation surface thrust, grouting pressure, excavation speed, excavation surface water head, tunnel depth and soil permeability coefficient on the maximum overpressure around the tunnel are analyzed, and the formula of maximum pore water pressure fitting is obtained Compared with the field measurements and analytical solutions, it shows that the three-dimensional fluid-structure interaction calculation can be more reasonable to analyze the disturbance of pore pressure caused by shield construction. At the same time, larger pore pressure value corresponds to larger surface subsidence, so the measured pore pressure value and numerical results can be compared to adjust the construction parameters. During the construction of the test section of Yingbin Three-way Tunnel in Shanghai Hongqiao, the on-site monitoring data showed that the construction parameters can be adjusted according to the pore pressure monitoring values to eventually reduce the land subsidence.