斜坡软弱地基路堤双指标设计体系  

Double criterions design system of embankment over sloped weak ground

作　　者：蒋鑫[1,2,3] 刘晋南[1,2,3,4] 吴朝阳[1,2,3] 姜春亮 邱延峻[1,2,3] 

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]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 [4]中国中铁二院工程集团有限责任公司,四川成都610031

出　　处：《铁道科学与工程学报》2016年第7期1253-1260,共8页Journal of Railway Science and Engineering

基　　金：国家自然科学基金资助项目(51378440);国家重点基础研究发展计划(973计划)项目(2013CB036204);中央高校基本科研业务费专项资金资助项目(SWJTU12CX067)

摘　　要：为准确获取斜坡软弱地基变形和路堤稳定性的内在联系,运用弹塑性有限元法,建立斜坡软弱地基在路堤自重荷载作用下的数值模型,根据弹塑性变形所获的地基变形系数以及剪切强度折减法所获的稳定安全系数,结合渝怀铁路实际工点的现场测试成果,构建了兼顾"变形"与"稳定"的斜坡软弱地基路堤双指标设计体系,并论证该体系的科学性、可操作性,提出该设计体系的实际运用步骤。研究结果表明:兼顾"变形"与"稳定"的斜坡软弱地基路堤双指标设计体系可更真实地反映路堤的稳定状态及变形发展趋势,有效指导工程设计及施工。In order to obtain the relationship between sloped weak ground deformation and embankment stabilityaccurately, a numerical model of embankment over sloped weak ground was established based on the elasto-plasticfinite element method. The double-criterion design system considering “deformation” and “stability” was putforward according to ground deformation coefficient and safety factor. They were respectively obtained by elastoplasticdeformation and shear strength reduction method with the field test results combined from the Chongqing-Huaihua Railway. The design system is proved to be scientific and operable, and the application steps of the designsystem are recommended. The results show that the stability and the deformation trends of embankment oversloped weak ground could be more truly reflected by the double criterions design system. The engineering designand construction could also be effectively guided by the design system.

关 键 词：斜坡软弱地基路堤 稳定安全系数 地基变形系数 有限元法 剪切强度折减法 刚体极限平衡法 

分 类 号：U416.1[交通运输工程—道路与铁道工程]