Research on depth sensitivity of weak layers in open-pit coal mine with soft rock slope

• Published in: Mei kuang an quan Vol. 52; no. 4; pp. 241 - 245
• Main Author: ZHAO Guibin, FENG Haiyang, HAN Meng, LIANG Ye, CHEN Yafei
• Format: Journal Article
• Language: Chinese
• Published: Editorial Office of Safety in Coal Mines 01.04.2021
• Subjects: limit equilibrium theory; open-pit coal mine; slope stability; underground rock movement monitoring; weak layer
• ISSN: 1003-496X
• DOI: 10.13347/j.cnki.mkaq.2021.04.043

In order to study the relationship between the depth of the weak layer and the stability of the soft rock slope, take a soft rock slope open-pit coal mine in Inner Mongolia as an example, based on engineering geological survey results and preliminary design, we determine the physical and mechanical indexes of rock and soil and establish a typical engineering geological model. According to typical engineering geological models, limit equilibrium theory is used to analyze the relationship between the depth of weak layers and the stability of soft rock slopes. The results show that if there is a weak layer of mudstone under the 10th coal floor of the mine, when the weak layer is located 20 m below the floor mudstone, it will have the greatest impact on the stability of the slope. Based on the research results, a weak layer survey plan and underground rock movement monitoring program are proposed.