倒梯形布筋方式的加筋土挡墙承载破坏性能分析  

Analysis of load-bearing failure performance of reinforced earth retaining wall with inverted trapezoidal reinforcement

作　　者：王家全[1,2] 祁航翔 梁宁 林志南 WANG Jiaquan;QI Hangxiang;LIANG Ning;LIN Zhinan(College of Civil and Architectural Engineering,Guangxi University of Science and Technology,Liuzhou 545006,China;Guangxi Zhuang Autonomous Region Engineering Research Center of Geotechnical Disaster and Ecological Control,Liuzhou 545006,China)

机构地区：[1]广西科技大学土木建筑工程学院,广西柳州545006 [2]广西壮族自治区岩土灾变与生态治理工程研究中心,广西柳州545006

出　　处：《自然灾害学报》2022年第4期154-163,共10页Journal of Natural Disasters

基　　金：国家自然科学基金项目(41962017);广西自然科学基金重点项目(2022GXNSFDA035081);广西高等学校高水平创新团队及卓越学者计划项目(桂教人才[2020]6号);广西研究生教育创新计划项目(YCSW2021310)。

摘　　要：基于已有室内条形基础下倒梯形布筋加筋土挡墙模型试验,采用FLAC3D有限差分软件建立加筋土挡墙三维数值模型,探讨了基础偏移距离D对挡墙极限承载力、面板水平位移、筋材拉应力分布以及潜在破裂面的影响。研究结果表明:基础的极限承载力随着基础偏移距离D的增大呈现出先增后减趋势,通过综合分析基础的极限承载力、0.1 b(b为基础宽度)沉降量对应的承载力以及基础最终沉降量,得出基础最佳偏移距离D=0.45 H(H为墙高);当D/H≤0.45时,挡墙面板的最大水平位移出现在顶部,当D/H>0.45 H时,挡墙面板最大水平位移出现在挡墙的中部距离墙趾约0.4 H的位置;随着D/H的增加,筋材的拉应力峰值逐渐向挡墙内部偏移,在筋长方向上均呈非线性分布;挡墙的潜在破裂面受基础偏移距离D影响显著,破裂面位置整体向荷载方向偏移,且可用指数型曲线表示。Based on the model test of the inverted trapezoidal reinforced soil retaining wall under the existing indoor strip foundation,the three-dimensional numerical model of the reinforced soil retaining wall was established by FLAC3D finite difference software,and the influence of the foundation offset distance D on the ultimate bearing capacity of the retaining wall,the panel horizontal displacement,tensile stress distribution of reinforcement and potential fracture surface was discussed. The research results show that the ultimate bearing capacity of the foundation first increases and then decreases with the increase of the foundation offset distance D. Through a comprehensive analysis of the ultimate bearing capacity of the foundation,the bearing capacity corresponding to the settlement of0.1b(b is the width of the foundation)and the final settlement of the foundation,the best offset distance of the foundation is D=0.45H(H is the wall height).When D/H≤0.45,the maximum horizontal displacement of the retaining wall panel appears at the top,when D/H>0.45H,the maximum horizontal displacement of the retaining wall panel appears in the middle of the retaining wall about 0.4H from the toe of the wall. With the increase of D/H,the peak tensile stress of the reinforcement gradually shifts to the inside of the retaining wall,and the distribution is nonlinear in the direction of the length of the reinforcement. The potential rupture surface of the retaining wall is significantly affected by the offset distance D of the foundation,and the position of the rupture surface is overall offset to the load direction,and can be represented by an exponential curve.

关 键 词：条形基础 加筋土挡墙 FLAC3D 承载性能 潜在破裂面 

分 类 号：TU4[建筑科学—土工工程] X43[环境科学与工程—灾害防治]