简谐波作用下加筋土挡墙动土压力模型试验研究  

Study on dynamic earth pressure of reinforced soil retaining walls under harmonic wave by model test

作　　者：徐鹏[1,2] 蒋关鲁[1,2] 任世杰[1] 廖丹 王智猛[3] XU Peng;JIANG Guanlu;REN Shijie;LIAO Dan;WANG Zhimeng(School of Civil Engineering,Southwest Jiaotong University,Chengdu,Sichuan 610031,China;Key Laboratory of Highway Engineering of Sichuan Province,Southwest Jiaotong University,Chengdu,Sichuan 610031,China;China Railway Eryuan Engineering Group Co.,Ltd.,Chengdu,Sichuan 610031,China)

机构地区：[1]西南交通大学土木工程学院,四川成都610031 [2]西南交通大学道路工程四川省重点实验室,四川成都610031 [3]中铁二院工程集团有限责任公司,四川成都610031

出　　处：《岩石力学与工程学报》2018年第A02期4283-4289,共7页Chinese Journal of Rock Mechanics and Engineering

基　　金：中国铁路总公司科技研究开发计划项目(2014G003–C)~~

摘　　要：动荷载作用下,惯性力与动土压力对加筋土挡墙的稳定性影响显著。尽管现有计算方法对地震荷载下加筋土挡墙的动土压力计算进行规定和建议,但大量工程实践表明,现有计算方法设计保守性问题却十分突出并且各方法之间存在较大差异。为了研究动荷载下加筋土挡墙的动土压力,采用简谐波加载的方式进行一组振动台模型试验。根据测试数值的时程记录,分析实测动土压力与现有计算解的异同,主要得到以下结论:当动土压力达到峰值时,墙体面板产生向墙背填土方向的位移,因而峰值土压力不能直接用于分析动荷载下墙体的主动破坏;惯性力与动土压力并非同时达到极值点,两者之间存在相位差;实测动土压力沿墙高的分布形式及合力作用点分别与M-O法、S-W法类似,并且测试值远小于计算值;在墙体达到主动状态时,筋材末端土压力为负值,即简谐荷载下动土压力小于静止时的土压力。Inertia force and dynamic earth pressure have remarkable influence on the stability of reinforced soil retaining walls under dynamic loading. Although the existing calculation methods provide rules and suggestions for calculation of the dynamic earth pressure of reinforced soil retaining walls under dynamic loading,a large number of engineering practices show that the methods are excessively conservative and they are distinctly different from each other. In order to study the dynamic earth pressure of reinforced soil retaining walls under dynamic loading,a shaking table model test was carried out by harmonic wave loading. According to the time history of values recorded during the test, similarities and differences between values tested and calculated by the current methods were analyzed. The following conclusions have been obtained:because when the earth pressure reaches peak values,the wall facing moves back to the fillings,so the peak values cannot be directly used to analyze the active failure of the wall under dynamic loading;the inertial force and the dynamic earth pressure do not reach peak values at the same time,and there is a phase difference between them;the distribution of the earth pressure along the wall height and its height of interaction point are similar to the M-O method and the S-W method respectively,and the test value is much smaller than the value calculated by the above methods;when the wall reaches a active state,the earth pressure at the end of reinforcements is negative,so the earth pressure is smaller than that without dynamic loading.

关 键 词：路基工程 加筋土挡墙 动荷载 动土压力 简谐波 主动状态 相位 

分 类 号：U416[交通运输工程—道路与铁道工程]