不同含水率下考虑筋土界面刚度软化的加筋边坡地震响应  

Seismic Response of Reinforced Soil Slope Considering Interface Stiffness Softening under Different Water Content

作　　者：李水江 童艳光 刘飞禹[2] 陈舒祺 LI Shuijiang;TONG Yanguang;LIU Feiyu;CHEN Shuqi(Guangzhou Environmental Protection Investment Group co.,ltd.Guangzhou 510330,China;School of Mechanics and Engineering Science,Shanghai University,Shanghai 200444,China)

机构地区：[1]广州环保投资集团有限公司,广东广州510330 [2]上海大学力学与工程科学学院,上海200444

出　　处：《防灾减灾工程学报》2023年第4期862-870,877,共10页Journal of Disaster Prevention and Mitigation Engineering

基　　金：国家自然科学基金资助项目(52078285,52378355)资助。

摘　　要：加筋土结构具有较好的整体变形协调能力以及抗震性能,被广泛应用于边坡工程中。基于不同含水率下残积土及筋土界面室内直剪试验数据,在有限差分软件中考虑不同含水率下土体和筋土界面抗剪强度参数,并通过FISH语言编程在数值计算中实现筋土界面剪切刚度动态变化过程,分析加筋边坡在不同含水率、筋材长度、筋材间距及地震峰值加速度工况下的位移、应力、加速度响应。模型计算结果表明:相比不考虑筋土界面刚度软化情况,考虑筋土界面剪切刚度软化情况下含水率对加筋边坡水平位移和加速度放大系数的影响较大;坡面侧向位移、坡顶沉降和筋材拉应力与回填土含水率呈正相关,加速度放大系数与含水率呈负相关;在一定范围内增加筋材长度能够有效降低加筋边坡坡面的水平位移;筋材间距对含水率越低的加筋边坡坡面侧向位移影响越大;地震峰值加速度越大,含水率对坡面水平位移影响越大。Reinforced soil structure has better overall deformation coordination ability as well as seis-mic performance,which is widely used in slope engineering.Based on the laboratory direct shear test data of residual soil and reinforcement-soil interface,the interface shear strength parameters of soil and reinforced soil under different water contents were considered in the finite difference software,and the dynamic process of interface shear stiffness of reinforced soil was realized in numerical calculation by using FISH programming language.The displacement,stress and acceleration responses of a rein-forced soil slope under different water contents,reinforcement lengths,reinforcement spacings and seismic peak acceleration conditions were analyzed.The results show that compared to the case with-out considering the stiffness softening of the reinforcement-soil interface,the effect of water content on the horizontal displacement and acceleration amplification coefficient of the reinforced soil slope is greater than that considering the shear stiffness softening.The lateral displacement of slope surface,the settlement at slope top and the tensile stress of reinforcement are positively correlated with the wa-ter content of backfill soil,while the acceleration amplification coefficient is negatively correlated with the water content of backfill soil.Increasing the length of reinforcement in a certain range can effective-ly reduce the horizontal displacement of the slope.The bar spacing has a greater influence on lateral displacement of the reinforced slope with lower water content.The greater the peak seismic accelera-tion,the greater the effect of water content on the horizontal displacement of the slope.

关 键 词：加筋边坡 含水率 筋土界面 剪切刚度 地震响应 

分 类 号：TU443[建筑科学—岩土工程]