摘要
运用FLAC3D数值模拟软件建立典型尺寸的边坡模型,然后将模型中的块石单元随机分布排列,继而利用软件内置的强度折减法对不同含石量下的边坡稳定性进行研究,并选取四个关键点的总位移值、竖向应力值进行定量分析,同时对剪切带的分布规律和安全系数大小进行比较。研究结果表明:块石含量的增大会显著改变土石混合体边坡的总位移场、竖向应力场以及剪切带的分布特征,其中:总位移等值线呈现出明显的锯齿状;而竖向应力等值线呈现出极不均匀的特征,且局部存在应力集中现象;剪切带呈现出明显的不规则特征并伴有绕石现象,且在含石量为40%~60%时,上述特征最为显著;安全系数随着含石量的增大而有不同程度的提高,这主要取决于块石结构的稳定性。
The soil-rock mixture slope is a common type of slope.Its medium distribution and strength characteristics show extremely dispersed which are greatly affected by the stone content which brings certain difficulties to modeling and analysis.In order to solve the above problems,while further exploring the stability and failure mode of the soilrock mixture slope,we attempt to use FLAC3D numerical simulation software to establish a slope with typical dimensions,and then arrange the stone elements in the model randomly.Further,we use the built-in strength reduction method to analyze the stability of the slope.The results show that the increase of the stone content will significantly change the displacement field,the vertical stress field and the distribution characteristics of the shear zone.Among them,the contours of total displacement are obviously jagged;and the contours of vertical stress show extremely uneven and there is a phenomenon of local stress concentration;the shear zone shows irregular with surrounding rocks,and when the stone content is 40%to 60%,the above characteristics are the most significant;the factor of safety increases in varying degrees with the increase of the stone content,which mainly depends on the stability of the structure.
作者
王其宽
梁世春
宋晓雷
WANG Qikuan;LIANG Shichun;SONG Xiaolei(School of Engineering and Technology,China University of Geosciences(Beijing),Beijing 100083,China;Shanxi Provincial Transportation Planning,Survey and Design Institute Co.,Ltd.,Taiyuan,Shanxi 030012,China)
出处
《水利与建筑工程学报》
2021年第2期30-35,共6页
Journal of Water Resources and Architectural Engineering
基金
山西省交通运输厅科研项目(2015-1-9
2018-1-30)。
关键词
土石混合体边坡
块石含量
随机分布
稳定性分析
soil-rock mixture slope
stone content
random distribution
stability analysis
