百米级高陡顺向坡变形与稳定性研究  

Deformation and Stability of Hundred-meter High and Steep Consequent Slope

作　　者：裴启涛 卢波[2] PEI Qitao;LU Bo(Wuhan Municipal Engineering Design&Research Institute Co.,Ltd.,Wuhan,Hubei 430023,China;Key Lab.of Geotechnical Mechanics and Engineering of Ministry of Water Resources,Yangtze River Scientific Research Institute,Wuhan,Hubei 430010,China)

机构地区：[1]武汉市政工程设计研究院有限责任公司,湖北武汉430023 [2]长江科学院水利部岩土力学与工程重点实验室,湖北武汉430010

出　　处：《水利与建筑工程学报》2021年第6期27-34,56,共9页Journal of Water Resources and Architectural Engineering

基　　金：国家自然科学基金资助项目(51609018);国家重点研发计划项目(2016YFC0401802)。

摘　　要：针对我国西南地区高陡顺向岩质边坡灾害频发而现有研究较少反映顺向坡在不同工况下的变形和稳定性问题,以西南地区某高陡顺向岩质边坡为例,构建有限差分数值仿真模型,采用遍布节理本构模型及强度折减法,系统研究了边坡在开挖、支护和降雨等工况下的边坡变形场、应力场、塑性区分布特征及稳定性安全系数。研究结果表明:顺向坡开挖引起的卸荷回弹变形主要集中在边坡中下部且临近开挖面附近;边坡总体上处于压应力状态,开挖后的边坡新增塑性区主要位于边坡开挖表层及坡脚部位;边坡潜在的滑移路径有两部分组成,一部分沿着顺向层面滑移,另一部分在岩体内部发生剪切滑移,边坡前缘剪出口大致位于坡脚以上13 m;边坡在开挖、支护及降雨工况下的安全系数依次为1.43、1.43和1.15,整体稳定性较好。This paper focuses on the frequent occurrence of disasters on the high and steep consequent rock slopes in southwestern China.Previous studies rarely reflected the deformation and stability of the consequent rock slopes under different conditions.Taking a high and steep consequent rock slope in Southwest China as an example,a finite-difference numerical simulation model was constructed,and the joint constitutive model and strength reduction method were used,so as to systematically study the characteristics of the deformation field,stress field and plastic zone distribution of rock slope,as well as coefficients of safety of slope stability.The results show that the unloading spring back deformation caused by the excavation of the consequent rock slope is mainly concentrated in the middle and lower part of the slope and near the excavation surface.The excavated slope was generally in a compressive stress state.The newly-added plastic zone of the rock slope after excavation is mainly located on the excavated surface and the toe of the slope.The potential slip path of the rock slope is composed of two parts.The slip path along the bedding plane and the shear slip path is inside the rock mass.The shear outlet of the rock slope is approximately 13 m above the foot of the slope.The coefficients of safety of the rock slope under the excavation,support and rainfall conditions are 1.43,1.43 and1.15 respectively.Namely,the overall stability of the consequent rock slope in this paper is better.

关 键 词：顺向坡 变形 稳定性分析 强度折减法 安全系数 

分 类 号：TU457[建筑科学—岩土工程]