路堤荷载作用下斜坡软弱地基变形耦合特性研究  

Deformation Coupling Characteristics of Sloped Weak Ground under Embankment Load

作　　者：刘晋南[1,2,3,4] 蒋鑫[1,2,3] 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]西南交通大学高速铁路线路工程教育部重点实验室,四川成都610031 [3]西南交通大学道路工程四川省重点实验室,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：《铁道学报》2015年第4期94-100,共7页Journal of the China Railway Society

基　　金：国家自然科学基金(51378440);国家重点基础研究发展计划(973计划)(2013CB036204);中央高校基本科研业务费专项资金(SWJTU12CX067);道路工程四川省重点实验室开放基金(LHTE008201308)

摘　　要：基于弹塑性平面应变有限单元法,本文模拟路堤水平分层分步填筑动态施工力学行为,建立斜坡软弱地基在路堤荷载作用下的数值分析模型,获得普通水平地基、水平软弱地基、普通斜坡地基及斜坡软弱地基4种工况下地基的侧向变形与竖向沉降随路堤填筑施工的动态变化规律。引入地基变形系数,分析地基侧向变形与竖向沉降的耦合、制约关系,奠定基于侧向变形控制的斜坡软弱地基路堤设计原则的理论基础,结合土工离心模型试验所获得的地基变形系数及位移场,讨论打入桩与抗滑桩加固斜坡软弱地基路堤的机理。Based on elastic‐plastic plane strain finite element method ,this paper derived dynamic variation law on ground lateral deformation and vertical settlement along with the embankment filling construction under four working conditions including common horizontal ground ,horizontal weak ground ,common sloped ground and sloped weak ground ,by simulating dynamic construction mechanical behavior during horizontally layered and staged fill placement of embankment and by establishing numerical analysis model for sloped weak ground under embankment loading .Ground deformation coefficient was introduced to analyze the coupling and constraining relationship between lateral deformation and vertical settlement ,which was used to propose the theoretical foundation for lateral deformation control based design principles about embankment over sloped weak ground . In combination with ground deformation coefficient and displacement field derived from geotechnical centrifugal model test ,the mechanism of weak ground embankment reinforced with driven pile and anti‐slide pile was dis‐cussed .

关 键 词：斜坡软弱地基路堤 变形耦合 有限元法 地基变形系数 

分 类 号：TU751.4[建筑科学—建筑技术科学]