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以武汉地铁2号线第23标段广埠屯站至虎泉站区间施工竖井为例,应用基于三维快速拉格朗日元法的计算软件FLAC3D建立竖井的三维模型,对竖井开挖与支护进行了模拟,计算中采用摩尔-库仑弹塑性模型,通过数值模拟及实测数据对比分析了竖井开挖导致的地面沉降规律、竖井周围岩体的水平位移特征、锚杆内力的分布特征及塑性区分布特征,从竖井的各种数据的分布规律推出了竖井的潜在滑动面,本竖井的潜在滑动面为上凹下凸的曲面,且从井口到井底滑动面位置逐渐向井壁靠近,其计算结果安全可靠,分析结果可为工程设计及施工提供参考。
Taking the construction shaft of Guangbu Tun Station to Huquan Station in section 23 of Wuhan Metro Line 2 as an example, a three-dimensional model of the shaft is established with FLAC3D, a calculation software based on the three-dimensional fast Lagrangian method. The simulation was carried out. In the calculation, the Mohr-Coulomb elastoplastic model was adopted. The law of land subsidence caused by shaft excavation, the horizontal displacement of rock mass around the shaft, the distribution characteristics of internal force of anchor rod and the plasticity were analyzed by numerical simulation and measured data District distribution feature, the potential sliding surface of the shaft is deduced from the distribution law of various data in the shaft. The potential sliding surface of this shaft is concave and convex curved surface, and the sliding surface from the wellhead to the bottom of the hole gradually approaches the well wall. The calculation results are safe and reliable, and the analysis results can provide reference for engineering design and construction.