Abstract
Geological disasters caused by underground mining occur frequently in karst mountainous areas of Southwest China. These disasters have received considerable attention. This study examines the influence of underground mining on the stability, stress, and deformation of karstified slopes with the aim of reducing losses caused by relevant geological disasters. The numerical models of the karstified rock mass are established according to the karstification characteristics and the uniaxial compressive strength of the karstified rock mass is obtained. Combined with the Hoek–Brown failure criterion and geological strength index, the normalized geological strength index of karstified rock mass is obtained. Taking the Pusa collapse as a case, a karstified slope model is established by the “vertical slice method.” The “strength reduction method” based on the Hoek–Brown strength criterion is applied to the stability analysis of karstified slope. Finally, the coal seam mining process was simulated and the disturbance effects of blasting on the rock mass were considered. The numerical simulation results are basically consistent with the actual collapse range and the displacement direction of the Pusa collapses. The karstification and underground mining will have adverse effects on the slope. The research method is helpful to research the deformation and failure process and the instability mechanism of underground mining for karstified slopes. It provides a technical and theoretical basis for evaluating this kind of slope.
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Funding
This study is financially supported by the National Natural Science Foundation of China (Grant No.42067046), the National Key R&D Program of China (2022YFC3003300), and the Science and Technology Planning Project of Guizhou Province, China (Grant Nos. QKHJC-ZK[2021]YB228, QKHJC-ZK[2022]YB075).
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Leng, D., Shi, W., Liang, F. et al. Stability and deformation evolution analysis of karstified slope subjected to underground mining based on Hoek–Brown failure criterion. Bull Eng Geol Environ 82, 174 (2023). https://doi.org/10.1007/s10064-023-03211-6
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DOI: https://doi.org/10.1007/s10064-023-03211-6