降雨作用下富水软岩边坡浅层破坏机理研究
Research on shallow damage mechanism of water-rich soft rock slope under rainfall action
李刚 1李元浩2
作者信息
- 1. 山东能源新矿集团,山东 新泰 271204
- 2. 北方工业大学,北京 100041
- 折叠
摘要
为了研究富水软岩边坡在降雨入渗过程中发生浅层破坏的变形问题,采用FLAC3D数值模拟软件,基于三维空间达西渗流理论,研究了在降雨过程中某露天矿边坡体表层变形规律和塑性区分布.结果表明:在降雨初期边坡体表层饱和度的变化与坡体表面倾角有关,边坡体倾角越大,垂直于坡面的入渗量越小,表层土体达到饱和状态所需时间更长;边坡体发生的变形和塑性破坏主要集中在北帮边坡中部泥岩和砂岩,这是由于这 2 种岩体风化严重,导致其力学性质差,在水力作用下更容易发生剪切破坏.
Abstract
In order to study the deformation of water-rich soft rock slopes with shallow damage during rainfall infiltration,the article uses FLAC3D numerical simulation software to study the deformation law of the surface layer of the slope body and the distribution of the plastic zone during rainfall based on the three-dimensional spatial Darcy seepage theory.The results show that the change of the saturation degree of the surface layer of the slope body at the beginning of rainfall is related to the inclination angle of the slope body,the larger the inclination angle of the slope body is,the smaller the infiltration volume perpendicular to the slope surface is,which takes longer time for the surface soil to reach the saturation state.The deformation and plastic damage occurring in the slope body is mainly concentrated in the middle of the north slope,mudstone and sandstone,due to the serious weathering of the two kinds of rock bodies,which leads to the poor mechanical properties of these two kinds of rock bodies,and is more prone to shear damage under the action of hydraulic force.
关键词
露天矿/顺倾边坡/软岩/流固耦合/FLAC3D/数值模拟Key words
open-pit mine/downhill slope/soft rock/fluid-solid coupling/FLAC3D/numerical simulation引用本文复制引用
出版年
2024
国家科技期刊平台
NSTL
万方数据