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通过不同隧道埋深、支护压力和掘进速度的盾构隧道施工地表沉降的大型物理模型试验,总结不同条件下的地表沉降规律,分析土压力的变化特性,归纳不同条件下的地表沉降曲线;探讨隧道埋深、支护压力和掘进速度对地表沉降值的影响,推导地表横断面沉降槽计算的经验公式。结果表明:随着隧道埋深增加,地表沉降值减小,地表横向沉降槽影响范围加宽;地表最终沉降值随支护超压比增加而增大;掘进速度变化对地表沉降的影响程度较小;施工扰动损伤围岩对地表沉降值有较大影响。
Large-scale physical model test of surface subsidence caused by shield tunneling with different tunnel depths, supporting pressures and tunneling speeds is conducted. Land subsidence laws under different conditions are summarized, and the variation characteristics of earth pressures are analyzed. The ground subsidence curves under different conditions are summarized. The effects of tunnel depth, supporting pressure and driving speed on the settlement of the ground surface are discussed, and the empirical formula for calculating the settlement section of the surface cross section is derived. The results show that with the increase of tunnel depth, the settlement of the ground surface decreases and the influence range of the surface horizontal settlement trench widens. The final settlement value of the surface increases with the increase of the overpressure ratio of the support. The influence of the variation of the heading speed on the settlement of the ground surface Small; construction disturbance damage to the surrounding rock has a greater impact on the value of the settlement.