干湿循环作用下膨胀土边坡失稳机理研究  

Study on Instability Mechanism of Expansive Soil Slope under Dry-wet Cycle

作　　者：鲍燕妮 BAO Yanni(Tongji Architectural Design(Group)Co.,Ltd.,Shanghai 200092,China)

机构地区：[1]同济大学建筑设计研究院(集团)有限公司,上海200092

出　　处：《路基工程》2022年第1期193-198,共6页Subgrade Engineering

基　　金：同济大学建筑设计研究院(集团)有限公司立项课题(2018KY10)。

摘　　要：以云南某道路工程为依托,采用室内试验的方法分析了干湿循环对土体开裂、渗透性和强度衰减的影响,揭示膨胀土路堑边坡3种典型的失稳模式:一是干湿循环作用下的边坡浅层流滑;二是高渗透夹层吸水膨胀导致的局部崩塌;三是老滑坡裂隙带强度控制的深层滑移。进而深入分析其影响因素及破坏机理,并介绍了具体加固处理措施,为类似膨胀土区域路基工程建设提供借鉴。Based on a road project in Yunnan province,it analyzes the influence of dry-wet cycle on soil cracking,permeability and strength attenuation by indoor test method,and reveals three typical instability modes of expansive soil cutting slope:one is shallow flow slip controlled by dry-wet cycle,two is local collapse caused by water absorption and expansion of high permeability interlayer,three is deep sliding controlled by the strength of fissure zone of an old landslide.Then,the influencing factors and failure mechanism are analyzed in depth,and the specific reinforcement and treatment measures are introduced,which can provides reference for the construction of subgrade engineering in similar expansive soil areas.

关 键 词：膨胀土 路堑边坡 干湿循环 滑坡机理 加固措施 

分 类 号：U416.167[交通运输工程—道路与铁道工程]