摘要
在地形、岩体组构、风化及开挖卸荷等作用下,某含软弱夹层顺层岩质建筑边坡已明显变形,继续开挖后可能出现大变形问题。通过开挖过程中边坡变形破坏特征及岩土体物理力学参数统计分析,基于FLAC3D软件,建立了边坡三维计算模型;计算分析了边坡开挖后的位移变形特征,评价了开挖后边坡的稳定性。结果表明,边坡开挖后软弱夹层上部岩土体变形较大,可能产生沿该软弱夹层的剪切滑移破坏,与现场监测数据基本吻合,可为顺层岩质边坡稳定性计算评价及优化同类型边坡开挖支护设计提供理论依据。
The deformation of the slope has occurred under the action of terrain,rock structure,weathered and excavation unloading. Based on the software FLAC3 D,calculation model for bedding rock slope excavation are established by the statistics and analysising on deformation character and the mechanical characteristics of bedding rock slope. Stability of bedding rock slope under excavation can be evaluated with calculating and analysising on displacement deformation characteristics. The calculation results show that the rock soil mass above weak interlayer has large deformation influenced by slope excavation and interlayer shearing slip failure along the weak interlayer may occur,which is coincident with the data of field monitoring. It can provide the theoretical foundation to assess the calculation of bedding rock slope stability and to optimize the support design of the same type slope excavation.
作者
陈正东
李正忠
赖勇
CHEN Zhengdong;LI Zhengzhong;LAI Yong(Gui zhou Bureau of Geology and Mineral Engineering Investigation Institute 2nd,Zunyi 563000;Chongqing Jiaotong University,Chongqing 400074)
出处
《矿产勘查》
2020年第2期395-402,共8页
Mineral Exploration
关键词
地质灾害
滑坡
三维数值分析
开挖稳定性
顺层岩质边坡
软弱夹层
geological disaster
landslide
three-dimensional numerical simulation
stability of excavation
bedding rock slope
weak interlayer