某高速铁路弱膨胀黏性土质路堑边坡变形演化特征  

Evolution Characteristics of Deformation in WeakExpansive Clayey Slopes of a High-speed Railway Cutting

作　　者：唐宇豪 付开隆[1] 赵文龙 王仕兴 TANG Yuhao;FU Kailong;ZHAO Wenlong;WANG Shixing(China Railway Eryuan Engineering Group Co.,Ltd.,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

出　　处：《高速铁路技术》2024年第5期106-112,共7页High Speed Railway Technology

基　　金：中铁二院工程集团有限责任公司科研基金(KDNQ203001)。

摘　　要：山区及丘陵地带高速铁路的修建易引发土质边坡位移变形,严重危害高速铁路安全运营。为研究广西某高速铁路黏性土质路堑边坡变形演化特征、探究边坡变形各项研究方法,本文利用星载合成孔径雷达干涉测量技术圈定边坡形变区域,以物探地震映像法时-频综合分析技术明确异常范围进而指导钻孔布置,辅以监测工作,详细探究研究区土质路堑边坡沉降变形机制。研究结果表明:(1)各项工作均可见由降雨导致小里程位置地基承载力下降,出现严重位移变形,受边坡整体性影响,中间里程位置岩土界面浅,以此为基点形成“翘板作用”引发大里程位置出现轻微上拱;(2)以综合方法为手段,提出以承载力和“翘板作用”两者为诱因共同影响土质路堑边坡位移趋势,为研究区病害整治提供了详实的基础资料,并可作为类似工程参考。The construction of high-speed railways in mountainous and hilly areas can easily induce displacement deformation of soil slopes,posing a severe threat to the operation safety of high-speed railways.To investigate the evolution characteristics of deformation of clayey cutting slopes along a high-speed railway in Guangxi,China,and to explore various methods for studying slope deformation,this paper employed satellite-based Synthetic Aperture Radar(SAR)Interferometry to delineate deformation zones of the slopes.Furthermore,the time-frequency integrated analysis technique of geophysical seismic imaging was used to pinpoint abnormal areas guiding the placement of boreholes,complemented by monitoring activities,to meticulously examine the settlement and deformation mechanisms of the soil cutting slopes in the study area.The study findings reveal that:(1)Rainfall-induced reductions in foundation bearing capacity at the starting chainage position result in severe displacement deformation,with the overall slope integrity influencing a shallow rock-soil interface at the mid-chainage position.This serves as a pivot point for a“see-saw effect,”causing minor upward arching at the ending chainage position.(2)By employing a comprehensive approach,this study proposes that both bearing capacity reduction and the“see-saw effect”act as concurrent triggers influencing the displacement trend of the earth cutting slopes.These findings provide detailed foundational data for the remediation of issues in the study area and can serve as a reference for similar projects.

关 键 词：高速铁路 土质路堑边坡 干涉测量技术 地震映像法 监测 承载力 翘板作用 

分 类 号：U238[交通运输工程—道路与铁道工程] U213.1