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为了减少基坑事故的发生,真实反映土钉墙的工作情况,选取三角形与梁的组合单元模拟土体与土钉的共同工作,建立了该组合单元的整体联合刚度矩阵,结合工程实例,对土钉支护基坑的变形进行研究。结果表明该组合单元可以近似模拟土体与土钉的共同工作,建立的联合刚度矩阵可以用于对杆系和弹性连续体进行整体分析。研究得到坑壁水平位移与基底隆起的变形规律及相应的最大值和出现位置,可为设计和施工提供参考,减少事故发生风险。计算结果亦表明土钉支护对于控制水平位移有很好的效果,在本工程中可以起到很好的支护作用。
In order to reduce the occurrence of foundation pit accidents and truly reflect the work of soil nailing wall, a combination unit of triangle and beam is selected to simulate the joint work of soil and soil nailing, and the overall joint stiffness matrix of the composite unit is established. Combined with engineering examples, Deformation of soil nailing foundation pit is studied. The results show that the unit can simulate the joint work of soil and soil nailing. The joint stiffness matrix can be used to analyze the whole of the rod and elastic continuum. The deformation law of the horizontal displacement of the pit wall and the base bump and the corresponding maximum and position of emergence are obtained by the study, which can provide references for design and construction and reduce the risk of accidents. The calculation results also show that soil nailing has a good effect on controlling the horizontal displacement and can play a very good supporting role in this project.