浅覆土超大直径盾构上浮与诱发地表隆起机理研究
Mechanisms of Uplift of Super-Large-Diameter Shield Tunnel in Shallowly Buried Condition and Its Induced Surface Heave

盾构隧道具有扰动小，适应性强等特点，因此广泛应用于城市交通基础设施建设。在实际施工过程中，隧道开挖引起的衬砌上浮和地表隆起现象明显。而在浅覆土开挖下，超大直径盾构隧道施工引起的扰动将更加显著。因此，本文依托上海北横通道项目的超大直径盾构开挖区间案例，建立精细化三维数值模型，通过对比数值模拟结果和监测结果验证了模拟方法的可靠性。在此基础上展开参数分析，探究了超大直径开挖下隧道上浮和地表隆起的机理，以及覆土厚度和注浆压力分对地表隆起的影响。研究结论对类似的浅覆土超大直径盾构隧道施工具有一定的参考和借鉴意义。
Shield tunnels are characterized by small disturbance and strong adaptability, so they are widely used in the construction of urban transportation infrastructure. In the actual construction process, the lining uplift and surface uplift caused by tunnel excavation are obvious. Under shallow overburden excavation, the disturbance caused by the construction of super-large diameter shield tunnel will be more significant. Therefore, this paper relies on the case of super-large-diameter shield excavation interval of Shanghai Beiheng Expressway Passage Project to establish a refined three-dimensional numerical model, and verifies the reliability of the simulation method by comparing the numerical simulation results with the monitoring results. On this basis, the parameter analysis is carried out to investigate the mechanism of tunnel uplift and surface heave under super-large diameter excavation, and the influence of overburden thickness and grouting pressure on surface heave. The conclusions of the study have certain reference and significance for the construction of similar shallow overburden super-large diameter shield tunnels.