Stability analysis of a slope containing water-sensitive mudstone considering different rainfall conditions at an open-pit mine

作     者：Guoyu Yang Yanlong Chen Xuanyu Liu Ri Yang Yafei Zhang Jialong Zhang Guoyu Yang;Yanlong Chen;Xuanyu Liu;Ri Yang;Yafei Zhang;Jialong Zhang

作者机构：State Key Laboratory for Geomechanics and Deep Underground EngineeringChina University of Mining and TechnologyXuzhou 221116China School of MinesChina University of Mining and TechnologyXuzhou 221116China Harwusu Open-Pit MineChina Shenhua Energy Co.LtdOrdos 010300China China Energy Investment Beidian Shengli Energy Co.LtdXinlinhot 026000China School of Mechanics and Civil EngineeringChina University of Mining and TechnologyXuzhou 221116China 

出 版 物：《International Journal of Coal Science & Technology》 (国际煤炭科学技术学报（英文）)

年 卷 期：2023年第10卷第4期

页      面：233-253页

核心收录：

学科分类：07[理学] 070601[理学-气象学] 0818[工学-地质资源与地质工程] 0706[理学-大气科学] 0823[工学-交通运输工程] 

基　　金：supported by the National Key R&D Program of China(2022YFC2903902) the National Natural Science Foundation of China(51974295) 

主　　题：Water-sensitivity SWCC Pore structure Rainfall infltration Slope stability 

摘      要：Mudstone, as a typical soft rock with wide distribution, has been endangering the slopes containing mudstone by its watersensitivity of swelling and weakening strength when encountering water. To comprehensively understand the water-sensitivity of mudstone and reveal its infuence on slope stability, we took the working slope containing water-sensitive mudstone of Shengli No.1 open-pit coal mine in Xilinhot, Inner Mongolia, China, as an example. Mudstone samples taken from the working slope were remodeled and saturated, and then triaxial tested to obtain the efective cohesion and efective internal friction angle. The flter paper method was used to obtain the soil–water characteristic curve of unsaturated mudstone. The pore structure of mudstone samples with diferent water contents were analyzed using the mercury intrusion porosimetry tests combined with the fractal dimension. The total pore content of the mudstone sample with lower water content is greater than that of the mudstone sample with higher water content. The mesopores are more in the mudstone sample with lower water content, while the small pores are more in the mudstone sample with higher water content. The variation of water content will change the complexity of mudstone pore structure. The higher the water content, the simpler the mudstone pore structure and the smoother the pore surface. Numerical calculations were conducted on the stability of the working slope under diferent rainfall conditions. The efective saturation on the mudstone layer surface changed and the plastic strain all occurred on the mudstone steps under diferent rainfall conditions. The key to preventing landslide of the slope containing water-sensitive mudstone in Shengli No.1 open-pit coal mine is to control the deformation and sliding of the mudstone layer.