某膨胀岩土边坡失稳机理分析及工程防治措施  

Failure Mechanism Analysis and Engineering Prevention Measures of an Expansive Soil Slope

作　　者：张勐 伍洪 宋学乾 ZHANG Meng;WU Hong;SONG Xueqian(Sichuan Road Engineering Consultation&Superuision Office Co.,Ltd.,Chengdu 610041;China Huaxi Engineering Design and Construction Co.,Ltd.,Chengdu 610031)

机构地区：[1]四川省公路工程咨询监理事务所有限责任公司,成都610041 [2]中国华西工程设计建设有限公司,成都610031

出　　处：《公路交通技术》2022年第5期35-41,共7页Technology of Highway and Transport

摘　　要：某在建公路路堑边坡最大坡高不足20 m,在勘察期间因未能准确把握膨胀性岩土的工程特性,致使边坡在施工过程中发生多次失稳破坏。基于该边坡变形历程及破坏特征,采用工程地质分析方法对该边坡失稳机理与稳定性进行分析评价,结果表明该边坡在各工况下均处于不稳定状态;采用传递系数法计算边坡剩余下滑力,提出了该边坡的防治措施:1)坡脚设桩板墙支挡,2)坡面设人字形骨架护坡,3)设截水沟、仰斜式泄水孔对地表及地下水疏排;总结了膨胀性岩土边坡的防治重点。The maximum slope height of a highway slope under construction is less than 20 meters.During the survey,the engineering characteristics of expansive rock and soil were not accurately grasped,resulting in multiple instability and failure of the slope during the construction process.Through the research on the deformation history and failure characteristics of the slope,the instability mechanism analysis and stability evaluation of the slope are carried out using the engineering geological analysis principle.The results show that the slope is in an unstable state under all conditions.The residual sliding force of the slope is calculated by the transfer coefficient method,and the prevention measures for the slope are proposed:1)Pile sheet wall is set at the slope toe for support;2)Herringbone skeleton slope protection is set on the slope surface;3)Intercepting ditches and inclined drain holes are set to drain the surface and groundwater.Finally,the key points of prevention and control of expansive rock soil slope are summarized.

关 键 词：公路滑坡 膨胀性岩土 失稳机理 防治措施 

分 类 号：U416.14[交通运输工程—道路与铁道工程]