Stability analysis of a slope containing water-sensitive mudstone considering different rainfall conditions at an open-pit mine
Guoyu Yang1
Yanlong Chen1
Xuanyu Liu2
Ri Yang3
Yafei Zhang4
Jialong Zhang4
1.State Key Laboratory for Geomechanics and Deep Underground Engineering,China University of Mining and Technology,Xuzhou 221116,China2.School of Mines,China University of Mining and Technology,Xuzhou 221116,China;Harwusu Open-Pit Mine,China Shenhua Energy Co.,Ltd,Ordos 010300,China3.China Energy Investment Beidian Shengli Energy Co.,Ltd,Xinlinhot 026000,China4.School of Mechanics and Civil Engineering,China University of Mining and Technology,Xuzhou 221116,China
摘要：Mudstone,as a typical soft rock with wide distribution,has been endangering the slopes containing mudstone by its water-sensitivity of swelling and weakening strength when encountering water.To comprehensively understand the water-sensitivity of mudstone and reveal its influence on slope stability,we took the working slope containing water-sensitive mudstone of Shengli No.l 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 effective cohesion and effective internal friction angle.The filter paper method was used to obtain the soil-water characteristic curve of unsaturated mudstone.The pore structure of mudstone samples with different 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 different rainfall conditions.The effective saturation on the mudstone layer surface changed and the plastic strain all occurred on the mudstone steps under different rainfall conditions.The key to preventing landslide of the slope containing water-sensitive mudstone in Shengli No.l open-pit coal mine is to control the deformation and sliding of the mudstone layer.
机标关键词：conditionsdifferentstabilityanalysisslopemineconsideringcontaining
论文发表日期：2023-08-28
在线出版日期：2025-08-15（本平台首次上网日期，不代表文献的发表时间）
页数：21( 233-253 )
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