石家庄太行山区残坡积土滑坡变形破坏机理研究

Study on Deformation and Failure Mechanism of Residual Soil Landslide in Taihang Mountain Area,Shijiazhuang

通过收集石家庄太行山区典型残坡积土地质环境资料,选取高家峪滑坡为研究对象,在分析太行山区典型残坡积土滑坡组构特征、变形成因、发育阶段的基础上,建立滑坡地质模型及数值模型,从滑坡位移、最小主应力、剪应变增量等方面分析滑坡支护前后变形机理。结果表明,切脚后的滑坡坡脚是最不稳定的部位,滑坡剪出口分布在中下部,简易支护后可提高滑坡的整体稳定性,尤其是坡脚位置;滑坡变形可分为蠕动变形、基本稳定、前部失稳坍塌、趋于稳定等4个阶段,在前2个阶段采用可行的支护方案有利于提高切脚滑坡的稳定性。

Based on the data of geological environment in Taihang Mountain area,Shijiazhuang,the Gaojiayu Landslide is selected as the research object,and the geological model of landslide is established by analyzing the structural characteristics,deformation causes and development stages of landslide.On this basis,the numerical model of landslide is established,and the deformation mechanism of landslide before and after supporting are studied from the aspects of displacement,minimum principal stress and shear strain increment.The results show that,(a)the slope toe of the cut slope is the most unstable part and the shear outlet of slope is distributed in the middle and lower part,and after simple supporting,the overall stability of the landslide is improved,especially the position of the slope toe;(b)the deformation of landslide can be divided into four stages of creep deformation stage,basic stability stage,front instability and collapse stage,and tending to stability stage,and in the first two stages,the stability of cutting foot landslide can be improved by adopting feasible support engineering.