考虑不同降雨条件的露天矿含水敏泥岩边坡稳定性分析

IF 6.9 1区 工程技术 Q2 ENERGY & FUELS
Guoyu Yang, Yanlong Chen, Xuanyu Liu, Ri Yang, Yafei Zhang, Jialong Zhang
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引用次数: 0

摘要

泥岩作为一种典型的分布较广的软岩,其遇水膨胀、强度减弱的水敏性已对含泥岩边坡造成危害。为全面了解泥岩的水敏性,揭示其对边坡稳定性的影响,以内蒙古锡林浩特胜利一号露天煤矿含水敏性泥岩的工作边坡为例。对工作边坡泥岩进行重塑和饱和,然后进行三轴试验,得到有效黏聚力和有效内摩擦角。采用滤纸法获得了非饱和泥岩的土-水特征曲线。采用压汞孔隙测量法结合分形维数对不同含水率泥岩样品的孔隙结构进行了分析。低含水率泥岩样品的总孔隙含量大于高含水率泥岩样品。低含水率泥岩样品中介孔多,高含水率泥岩样品中小孔多。含水率的变化会改变泥岩孔隙结构的复杂性。含水率越高,泥岩孔隙结构越简单,孔隙表面越光滑。对不同降雨条件下工作边坡的稳定性进行了数值计算。不同降雨条件下,泥岩层表面有效饱和度发生变化,泥岩台阶均发生塑性应变。胜利一号露天矿含水敏泥岩边坡防治滑坡的关键是控制泥岩层的变形和滑动。
本文章由计算机程序翻译,如有差异,请以英文原文为准。

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

Stability analysis of a slope containing water-sensitive mudstone considering different rainfall conditions at an open-pit mine
Abstract 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.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 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.1 open-pit coal mine is to control the deformation and sliding of the mudstone layer.
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来源期刊
CiteScore
11.40
自引率
8.40%
发文量
678
审稿时长
12 weeks
期刊介绍: The International Journal of Coal Science & Technology is a peer-reviewed open access journal that focuses on key topics of coal scientific research and mining development. It serves as a forum for scientists to present research findings and discuss challenging issues in the field. The journal covers a range of topics including coal geology, geochemistry, geophysics, mineralogy, and petrology. It also covers coal mining theory, technology, and engineering, as well as coal processing, utilization, and conversion. Additionally, the journal explores coal mining environment and reclamation, along with related aspects. The International Journal of Coal Science & Technology is published with China Coal Society, who also cover the publication costs. This means that authors do not need to pay an article-processing charge.
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