降雨作用下矸石山边坡稳定性弱化成因研究  

Research on weakening causes of waste dump slope stability under the effect of rainfall

作　　者：赵新涛[1] 孙文标[1] 

机构地区：[1]河南工程学院安全工程学院,河南省郑州市451191

出　　处：《中国煤炭》2017年第8期158-162,共5页China Coal

基　　金：河南省科技发展计划(162102210288);河南省高等学校重点科研项目计划(13B620924);河南工程学院博士基金项目(D2013020)

摘　　要：将矸石散体归属为非饱和土,基于非饱和土抗剪理论研究了降雨作用下边坡抗剪强度变化过程及弱化机理,采用FLAC对降雨前后工况下矸石山边坡的稳定性进行了数值模拟分析。分析结果表明,在雨季随着持续降雨,矸石山边坡基质吸力明显降低,抗剪强度显著弱化,在非雨季边坡则具有一定的抗剪强度;降雨后矸石山边坡的变形速度、位移以及剪应力增量均明显增加,滑动趋势的范围有所增大,边坡稳定性及安全储备明显降低,易发生滑坡事故。进行了实际降雨作用下的矸石山稳定性的现场监测试验,试验得出的结论与理论分析及数值模拟基本一致。Regarding gangue bulk solid as unsaturated soil, the shear strength change process and weakening mechanism of slope under the effect of rainfall were studied base on unsaturated soils shear strength theory, the stability of waste dump slope before and after the condition of rainfall were analysed by using FLAC. The study results showed that the matric suction of waste dump slope decreased obviously and the shear strength weakened significantly with the continuous rainfall during the rainy season, while the slope had a certain shear strength during the dry season; the deformation velocity, displacement, shear stress increment increased significantly after rainfall, and range of sliding trend enlarged, slope stability and emergency capacity decreased obviously, so landslide accident was easy to happen. The field monitoring experiment of waste dump stability under the action of rainfall was carried out, and its conclusions were basically the same with that of theoretical analysis and numerical simulation.

关 键 词：矸石山 降雨作用 边坡稳定性 

分 类 号：TD997.3[矿业工程—选矿]