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为了深入研究基坑开挖过程中超挖厚度的不同对基坑围护结构的内力和位移及周边环境的影响,运用岩土有限元软件Midas GTS模拟了在不同超挖厚度下深基坑开挖过程,从而得到在不同超挖厚度下基坑围护结构内力、变形及地表沉降的分布规律。计算和分析结果表明:超挖厚度对基坑围护结构的内力和位移及地表沉降产生了较大影响,尤其是围护结构水平位移及地表沉降;在超挖的影响下桩和锚索不能同时起到维护的作用,使得超挖下桩后土体变形较大,基坑的稳定性处于不利的状态。研究结果将有助于提高深基坑设计水平,为类似工程的设计、施工和研究提供必要参考。
In order to deeply study the influence of different overburden thickness on the internal forces and displacements and the surrounding environment of the excavation, the finite element software Midas GTS is used to simulate the excavation of the deep excavation under different overburden thickness Process, so as to obtain the distribution rule of internal force, deformation and surface settlement of the foundation pit retaining structure under different over-digging thickness. The results of calculation and analysis show that the over-excavation thickness has a great influence on the internal force and displacement of the retaining structure and the settlement of the earth’s surface, especially the horizontal displacement of the retaining structure and the settlement of the earth’s surface. At the same time play the role of maintenance, making over-under-pile soil deformation after a large foundation pit stability at an unfavorable state. The results of the study will help to improve the design level of deep foundation pit and provide necessary reference for the design, construction and research of similar projects.