摘要
本文以层间发育有软弱夹层的缓倾角切向岩质边坡为研究对象,通过对边坡失稳变形特征的研究,分析边坡变形的影响因子,认为坡体后缘贯通的张拉破裂面与软弱夹层将坡体切割成规模不等的块体,边坡大范围开挖而又不作支护处理致使块体在顺层方向存在陡峻临空面,外倾的软弱夹层在雨水反复浸蚀作用下力学强度不断降低并演化为滑面,随着时间效应的累积以及机械施工振动、静水压力等不利因素的复合作用影响,当块体下滑力大于抗滑力时,边坡将会发生顺向滑移—拉裂破坏。同时采用层次分析法对影响因子进行分析,得出前缘开挖卸荷、降雨及软弱夹层是导致边坡失稳变形主控因子的结论。
In this paper,gentle-dip-angle tangential rock slopes with weak interlayers are studied,and the factors affecting the deformation of slopes are studied based on the deformation characteristics of unstable slopes,and it is considered that the tensile fractures penetrating the backside of a slope and the internal weak interlayers will cut the slope into numerous blocks of varying sizes and the slope is massively excavated without shoring,steep weak planes will be created along the bedding plane.The mechanical strength of exposed weak interlayers will decrease gradually under the action of repeated rainfall erosion,and eventually be transformed to sliding planes.Under cumulative time effect and the combined effects of unfavorable factors such as mechanical vibration and hydrostatic pressure,the slope will slide along the bedding plane,experiencing tensile failure,when the sliding force is greater than the resistive force.The factors affecting the deformation of slopes are analyzed using the analytic hierarchy process,and it is determined that front-side excavation unloading,rainfall,and weak interlayer are the main factors leading to slope instability and deformation.
作者
王家琳
庞平
李香福
龙举
WANG Jia-lin;PANG Ping;LI Xiang-fu;LONG Ju(Guizhou Institute of Geological Engineering Exploration&Design,Guiyang 55008,Guizhou;111 Geological Party,Guizhou Bureau of Geology and Mineral Exploreion&Development,Guiyang 55008,Guizhou)
出处
《地下水》
2021年第5期163-167,共5页
Ground water
关键词
切向边坡
软弱夹层
成因机理
层次分析法
Tangential slope
weak interlayer
formation mechanism
analytic hierarchy process
