考虑筋材有效拉力的加筋土路堤稳定性分析方法  

Stability Analysis Method of Reinforced Earth Embankment Slope Considering Effective Tensile Force of Reinforcements

作　　者：蒋楚生[1] 闫清卫[2] 陈廷君 肖世国[3] JIANG Chusheng;YAN Qingwei;CHEN Tingjun;XIAO Shiguo(China Railway Eryuan Engineering Group Co.,Ltd.,Chengdu 610031,China;Southwest Jiaotong University,Chengdu 610031,China;MOE Key Laboratory of High-speed Railway Engineering,Southwest Jiaotong University,Chengdu 610031,China)

机构地区：[1]中铁二院工程集团有限责任公司,成都610031 [2]西南交通大学,成都610031 [3]西南交通大学高速铁路线路工程教育部重点实验室,成都610031

出　　处：《高速铁路技术》2023年第6期46-50,共5页High Speed Railway Technology

摘　　要：加筋土技术在铁路路基工程中的应用愈加广泛,而工程设计中拉筋最大有效拉力的取值尚存在不合理之处。本文针对拉筋有效拉力对路堤边坡稳定性的影响,建立了考虑不同位置拉筋最大拉力的加筋土路堤边坡稳定性分析方法。研究结果表明:(1)将由侧摩阻力与抗拉断力控制的拉筋所能提供的极限抗拉作用力与拉筋的破坏模式相关联,分别计算拉筋拉断和拔出破坏模式下的极限拉力,以确定不同位置拉筋可提供的最大有效拉力;(2)基于瑞典圆弧条分法,将拉筋作用作为附加抗滑力矩引入边坡稳定系数计算公式,给出了加筋土路堤稳定性分析方法,可编制Micorsoft Excel计算表格,在实际工程中方便使用;(3)典型工程实例分析表明,本文方法与数值模拟得到的路堤边坡稳定系数误差在5%以内,提出的方法具有合理性与实际可操作性。The reinforced soil technology is widely used in railway subgrade engineering,but it is still not reasonable for the determination of effective tensile force of reinforcements involoved in the reinforced slope stability in practical design.In order to deal with the influlences of the tension of reinforcements on the slope stability,an analysis method for the reinforced slope stability considering possible maximum tension of the reinforcements at various locations is proposed.The research results show that(1)The relationship between failure modes and maximum tension effect of the reinforcements controlled by side friction on their surfaces and ultimate pulling force of the materials are established to determine the possible maximum tension provided by the reinforcements.(2)Based on the Swedish slice method,the reinforcement action is introduced into the calculation formula of slope stability coefficient as an additional anti-sliding moment.So the stability analysis method of reinforced soil embankment is given and it can be carried easily out via Microsoft spreading sheets in the designs of practical engineering.(3)Analysis results of some typical engineering examples show the relative error between the proposed method and the stability coefficient of embankment slope obtained by numerical simulation is less than 5%,and the proposed method is reasonable and practical.

关 键 词：加筋土路堤 边坡稳定性 瑞典圆弧法 拉筋破坏模式 筋材有效拉力 

分 类 号：U213.1[交通运输工程—道路与铁道工程]