Damage features and dynamic triggering mechanism of the Jianshanying landslide induced by underground mining in Shuicheng County, Guizhou Province, China

Abstract

AbstractExtensive mining of mineral resources in the mountainous areas of southwestern China has caused frequent occurrences of landslides, threatening social and economic development. Therefore, further research on the formation mechanism of such landslides is urgently investigated. Using detailed geological investigations, a numerical simulation, and related theoretical analysis reveal the dynamic triggering mechanism, influencing factors, and mechanical evolution model of the Jianshanying landslide under the coupled action of heavy rainfall and mine blasting vibrations. Results showed the following: First, rainfall of about 5 days, which nearly saturated the slope, and nearly 3 blasting cycles (peak horizontal and vertical velocities of 0.3375 and 0.1573 cm/s, respectively) executed close to it were the main controlling factors inducing the landslide. Second, the macroscopic deformation of the slope manifested obvious subsidence and tipping, and the maximum vertical and horizontal displacements of the slope shoulder reached 13.466 and 2.961 m, respectively. Third, the critical failure of the slope occurred at 15 s in the dynamic analysis, and its subsequent responses involved disintegration and fragmentation, debris flow, scraping of the sliding bed, and self-stabilized accumulation. Finally, its mechanical evolution model was divided into the subsidence stage and the shear-tension stage. These results provide technical support for early identification and risk management of geological hazards in mines in southwestern China.

Keywords

• Jianshanying landslide
• mine blasting vibrations
• dynamic triggering mechanism
• underground mining-induced landslide
• multi-layer shallow coal seam
• block discrete element method simulation