桩板墙支护下的高速铁路陡坡地基路堤变形演化特性  

Deformation Characteristics of Embankment Supported by Sheet-pile Wall on Steep Slope Ground in High-speed Railway

作　　者：谢涛[1,2] 罗强[1,2] 张良[1,2] 连继峰[1,2] 周成[3] XIE Tao;LUO Qiang;ZHANG Liang;LIAN Jifeng;ZHOU Cheng(School of Civil Engineering,Southwest Jiaotong University,Chengdu 610031,China;Key Laboratory of High-speed Railway Engineering,Ministry of Education,Chengdu 610031,China;China Railway Eryuan Engineering Group Co.,Ltd.,Chengdu 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]西南交通大学高速铁路线路工程教育部重点实验室,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：《铁道学报》2020年第10期127-135,共9页Journal of the China Railway Society

基　　金：国家重点基础研究发展计划(2013CB036204)。

摘　　要：高速铁路对路基工后变形要求严格。以某陡坡地基桩板墙支护路堤为研究对象,基于针对桩体位移演化特性及路堤填土变形空间响应的900余天现场观测,构建了以限制桩前地基土横向应变为核心、检算点桩体位移为表征的桩板墙长期变形状态评价方法,讨论了相应桩体位移规范限值。研究表明:深锚固、强约束桩板墙能有效限制陡坡地基路堤侧向变形,桩顶位移仅为23 mm,其中填筑完成后占30%、1~1.5 a趋于稳定;桩体侧移引起路堤填土横向张拉变形的影响范围介于墙背和稳定区之间,竖向工后压缩变形符合中部大、上下端小的分布规律,且收敛快于横向;地面处桩板墙位移为13 mm,处于时间效应微弱的快速收敛状态,而规范有关该处10 mm的位移限值则对应无时间效应的纯弹性状态。The deformation of subgrade has significant effect on track regularity for high-speed railway.A set of tests about lateral displacement of sheet-pile wall supporting the subgrade,deformation of subgrade and ground soil were conducted lasting more than 900 days.An evaluation method of long-term deformation for subgrade was constructed,which is based on the restriction of the lateral strain of the foundation soil in front of the pile and the lateral displacement of sheet-pile wall.The results indicate that the lateral deformation of embankment is effectively limited by sheet-pile wall.The lateral displacement of pile on top is only 23mm,which tends to be stable until 1-1.5 years later,and about 30%of the total displacement completed after embankment being filled.The lateral deformation of the pile produces a stretch effect on the backfills,and the influence scope lies between active zone and transition zone.The distribution law of longitudinal strain of embankment fill is big in the middle,and which is easier to be stable than the lateral deformation.The long-term deformation state of sheet-pile wall is quickly stable,which means the deformation after construction is negligible,and the specification of the pile displacement on ground is somewhat strict.

关 键 词：高速铁路 陡坡地基 桩板墙支护路堤 长期变形状态 现场测试 

分 类 号：TU413[建筑科学—岩土工程]