水平荷载作用下重力锚室内模型试验及数值模拟分析

摘要

在室内物理模型试验的基础上,结合有限元软件,对重力锚在钙质土上的水平承载过程进行了模拟,对有限元计算结果进行了可靠性验证,并进一步对其承载机理进行了深入分析.有限元分析得到的钙质岩土上荷载-位移关系及土体塑性应变结果显示,重力锚在不同土质条件下呈现不同的破坏形式,即渐进式破坏和突变式破坏,不同的破坏形式和锚的基础底面形式和土的物理力学性质等有很大关系;相较于渐进式破坏,突变式破坏具有更大的风险,在设计计算当中需要予以充分的重视.%This paper,based on the lab model test and combined with the finite element model (FEM),conducted simulation on the failure mechanism of gravity anchor under lateral load on calcareous soil,and verified the reliability of FEM test results.Furthermore,it conducted deep analysis on its bearing mechanism.According to the contours of horizontal bearing capacity-displacement relationship and soil plastic strain obtained through FEM analysis,gravity anchor shows different failure modes under different soil conditions:progressive failure and sudden failure.The failure mode is closely related to the shape of anchor bottom and the physical and mechanical properties of soil.In practice,the sudden failure,compared with the progressive failure,may cause higher risks,and require more attention in design.