Abstract
The rock burst caused by geological structures is abrupt and destructive, and the special structure of a graben fault decides the uniqueness of mine ground pressure in the mining process. By simplifying the graben fault structure, the evolution law of roof stress during the recovery process was studied based on the theory of the elastic shear beam. The change laws of stress field and displacement nearby the fault during the advancement process of the working face were explored through a numerical simulation, and the instability mechanism and laws of rock strata nearby this graben fault were revealed. This study will be of great significance for preventing and controlling the rock burst in the graben fault.
Highlights
Fault rock burst accidents often occur when the mining activities are close to the fault. e fault suddenly ruptures and dislocates under the influence of mining activities, which has the characteristics of releasing more energy, large magnitude, deep focal point, and large damage intensity [1,2,3]
Under the background of a rock burst accident in the New Dragon Mine, the evolution laws of roof stress in a graben fault structure during the mining process were studied, and the importance was attached to the reinforcement of vulnerable parts at fixed points under different states
The change laws of the stress field and displacement nearby the graben fault were explored through a numerical simulation, and afterward, the instability mechanism and laws of rock strata nearby the graben fault were intuitively revealed
Summary
Fault rock burst accidents often occur when the mining activities are close to the fault. e fault suddenly ruptures and dislocates under the influence of mining activities, which has the characteristics of releasing more energy, large magnitude, deep focal point, and large damage intensity [1,2,3]. On February 22, 2020, a rock burst-induced accident took place in the upper entry of a 2305S fully mechanised caving face at the south wing of − 810 m horizontal No 2 mining area of Shandong New Dragon Energy Co., Ltd., in China, leading to four deaths and a direct economic loss of RMB 18,530,000. With the increase in mining depth and intensity of coal mine resources, dynamic disasters including mining-induced rock bursts are increasingly aggravated, seriously threatening coal mining safety. Most of the eastern coal mines in Northern China are tectonically characterised by faults, which are developed in groups and usually appear in forms like graben [10, 11]
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