斜坡地基上高填方挡墙侧向极限土压力简化算法  

A simplified analysis method on ultimate lateral earth pressure on gravity wall against high embankment on a slope

作　　者：周应兵 谢鑫 郭瑞 刘大伟[1] 肖世国[2,3] ZHOU Yingbing;XIE Xin;GU0Rui;LIU Dawei;XIAO Shiguo(Construction Headquarters of Bid Section III of Quzhou-Ningde Railway (in Fujian),China Railway 12^th Bureau Group Co.Lid,Ningde,Fujian 352300,China;Department of Geological Engineering,Southwest Jiaotong University,Chengdu ,Sichuan 610031,China;Key Laboratory of High-speed Railway Engineering, Ministry of Education,Southwest Jiaotong University,Chengdu ,Sichuan 610031,China)

机构地区：[1]中铁十二局集团有限公司衢宁铁路(福建段)Ⅲ标工程指挥部,福建宁德352300 [2]西南交通大学地质工程系,四川成都610031 [3]西南交通大学高速铁路线路工程教育部重点实验室,四川成都610031

出　　处：《中国地质灾害与防治学报》2018年第6期86-91,共6页The Chinese Journal of Geological Hazard and Control

基　　金：国家自然科学基金(51578466);中铁十二局集团有限公司科研项目(2016-YGS-10)

摘　　要：斜坡地基上高填方边坡产生的侧向极限土压力是重力式挡土墙设计中一个关键因素。为了简化计算分析该土压力,基于墙后填方土体的折线型"越顶"失稳破坏模式,采用极限平衡方法建立了滑动土体及其与墙体之间土体的受力分析模型,推导了墙后侧向极限土压力计算表达式,利用极值原理得到了极限土压力的计算方法。将所提出的方法应用于衢宁铁路屏南车站斜坡地基高填方工程,计算结果表明,与塑性极限分析法所得的侧向极限土压力计算结果的相对误差在1%以内;同时,给出了填方坡面倾角、墙背倾角、自然斜坡面倾角、填土内摩擦角、墙背外摩擦角等对墙后侧向极限土压力的影响特征。The ultimate lateral earth pressure caused by high filled slope on retaining wall is a key factor in the design of gravity retaining wall.In order to simplify analysis of the earth pressure on gravity wall,based on,the polyline-shaped "over-top"failure mode of backfill soil,a mechanical analysis model for the sliding soil mass was established using limit equilibrium method,and the expression of the earth pressure behind the wall was derived.According to the principle of extreme value,the calculation procedure of ultimate lateral earth pressure was obtained.The proposed method was applied to a high embankment on a slope foundation of Pingnan station in Quzhou-Ningde railway .The calculation results show that the relative error between the results obtained using the proposed method and the kinematical limit analysis method is within 1%.The influence of backfill slope angle,inclination of the wall back,natural slope angle,internal friction angle of the filling,and external friction angle of the wall on the ultimate earth pressure on the wall are also quantitatively illustrated.

关 键 词：斜坡地基 高填方 极限土压力 重力式挡土墙 

分 类 号：U417.116[交通运输工程—道路与铁道工程]