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以深圳市某地下车站深基坑工程为依托,运用有限元软件PLAXIS对围护结构的深层水平位移、坑底土体隆起、周围土体沉降和支撑轴力变化进行了研究,得出:1)墙体水平位移呈现出“两头小、中间大”的凸肚子形状;2)在开挖深度较大时,坑底将发生塑性隆起,呈现出“两边大、中间小”的形式,坑外土体沉降呈现出抛物线分布形式;3)开挖卸荷引起的坑外主动土压力主要由临近开挖面的支撑反力来平衡,新支撑的架设会导致各道支撑轴力进行重分布。研究结果可对类似工程的信息化施工提供参考。
Based on the deep foundation pit project of an underground station in Shenzhen City, the finite element software PLAXIS was used to study the deep horizontal displacement of the retaining structure, the uplift of the soil at the bottom of the pit, the settlement of the surrounding soil and the change of the supporting axial force. The results are as follows: 1 ) The horizontal displacement of the wall shows a convex stomach shape “2 small, middle large”; 2) When the excavation depth is large, the bottom of the pit will be plastic uplift, showing “big and small middle” And the settlement of soil outside the pit presents a parabolic distribution. 3) The active earth pressure outside the pit caused by excavation unloading is mainly balanced by the supporting reaction force of the adjacent excavation face. The erection of the new support will cause the axial support force Redistribution. The results of the research can provide reference for the information-based construction of similar projects.