张吉怀高速铁路深路堑边坡失稳机理及治理措施  

Instability Mechanism and Treatment Measures of Deep Cutting Slope of Zhangjiajie-Jishou-Huaihua High Speed Railway

作　　者：谭家华[1] TAN Jiahua(China Railway Siyuan Survey and Design Group Co.Ltd.,Wuhan 430063,China)

机构地区：[1]中铁第四勘察设计院集团有限公司,武汉430063

出　　处：《铁道建筑》2023年第7期138-143,共6页Railway Engineering

摘　　要：张吉怀(张家界—吉首—怀化)高速铁路某深路堑施工过程中出现坡顶开裂错动、环形裂缝、桩孔护壁开裂等变形迹象,通过地质调绘、钻探、地表及深部位移监测等手段,查明坡体地质特征,获取滑面信息,并结合施工现状采取了针对性工程处理措施。结果表明:工程区为炭质页岩地层,风化层厚,受区域断裂带影响,岩体破碎,属劣质岩边坡;地质条件软弱、降雨影响、施工扰动是产生工程滑坡的主要诱因;边坡存在类均质体圆弧滑动和顺弱风化层顶面深层滑动两种破坏模式;通过采取刷方卸载+支挡加固+综合防排水综合处理措施,经评价边坡安全稳定。During the construction of a deep cutting on the Zhangjiajie-Jishou-Huaihua high speed railway,there were signs of deformation such as cracking and displacement of the slope top,circular cracks,and cracking of the pile hole protection wall.By means of geological mapping,drilling,surface and deep displacement monitoring,the geological characteristics of the slope were identified,the slip surface information was obtained,and some targeted engineering treatment measures were taken based on the current construction situation.The results show that the project area is a carbonaceous shale stratum with thick weathered layer.Affected by the regional Fracture zone,the rock mass is broken and belongs to inferior rock slope.The main causes of engineering landslides are weak geological conditions,rainfall effects,and construction disturbances.There are two failure modes in the slope,namely circular sliding of homogeneous bodies and deep sliding along the weakly weathered top interface.The slope stability is evaluated by taking the comprehensive treatment measures of brush unloading,support reinforcement and comprehensive water prevention and drainage.

关 键 词：高速铁路路基 劣质岩边坡 炭质页岩 位移监测 风化界面滑坡 滑坡治理 

分 类 号：U238[交通运输工程—道路与铁道工程]