条形荷载下三明治形加筋土挡墙的变形特性分析  

Analysis of Deforming Behaviors of Sandwich Reinforced Soil Retaining Wall under Strip Load

作　　者：刘飞禹[1] 颜思琪 陈江 陈加亮 LIU Feiyu;YAN Siqi;CHEN Jiang;CHEN Jialiang(Department of Civil Engineering,Shanghai University,Shanghai 200444,China;Zhejiang Communications Investment Group Co.,Ltd.,Hangzhou 310014,China;Ningbo Communications Planning Institute Co.,Ltd.,Ningbo 315000,China)

机构地区：[1]上海大学土木工程系,上海200444 [2]浙江省交通投资集团有限公司,浙江杭州310014 [3]宁波市交通规划设计研究院有限公司,浙江宁波315000

出　　处：《防灾减灾工程学报》2021年第5期1080-1086,共7页Journal of Disaster Prevention and Mitigation Engineering

基　　金：国家自然科学基金资助项目(51678352,52078285)资助。

摘　　要：为了研究条形荷载作用下三明治形混合填土方式对加筋土挡墙变形特性的影响,采用FLAC^(3D)建立了数值计算模型,分析了三明治形加筋土挡墙的黏土弹性模量E_(1)、砂土弹性模量E_(2)、砂土厚度d、筋材长度L以及荷载距面板距离D对挡墙变形特性的影响。结果表明:相对于加筋黏土挡墙,三明治形加筋土挡墙变形大幅减小,减少其墙顶沉降约32%,减少面板位移约44%;其土压力分布规律为墙后水平土压力大体上随填土深度的增加而增大;适当增大黏土弹性模量有利于减小挡墙顶面差异沉降;砂土存在一个最优弹性模量,使得面板水平位移最小;三明治形加筋土挡墙存在一个最优砂土厚度,使得三明治加筋土挡墙工作性能最佳;当L/H≥0.7时,继续增加筋材长度或当D/H≥0.3时,继续增大荷载距面板距离对挡墙影响相对较小。FLAC^(3D)was used to establish a numerical model to study the influence of clay reinforced with geogrid encapsulated in thin layers of sand on the deformation behaviors of reinforced soil retaining wall.The influence of elastic modulus of clay E_(1),elastic modulus of sand E_(2),thickness of sand d,length of reinforcement L,and distance between the load and the panel D on the deformation behaviors of sandwich reinforced soil retaining wall were analyzed.The results showed that the deformation behaviors of sandwich reinforced soil retaining wall were greatly improved.The overhead settlement of the retaining wall was reduced by 32%,and the horizontal displacement of the panel was reduced by 44%.The distribution of earth pressure was that the horizontal earth pressure behind the wall increases with the increase of the filling depth.A proper increase in the elastic modulus of clay was beneficial to reduce the differential settlement of the top surface of the retaining wall.There was an optimum elastic modulus of sand to minimize the horizontal displacement of the panel.There was an optimum sand thickness of the sandwich reinforced earth retaining wall to optimize the deformation behaviors of the retaining wall.There was a relatively insignificant influence on retaining wall to increase the length of reinforcement when L/H≥0.7 or to increase the distance between the load and the panel when D/H≥0.3.

关 键 词：加筋土挡墙 条形荷载 数值模拟 最优砂土厚度 

分 类 号：TU443[建筑科学—岩土工程]