Abstract
Numerous room-and-pillar mining goaf are apparent in western China due to increasing small coal mining activities, which causes the collapse of the overlying coal pillars and the occurrence of strong ground pressure on the longwall face and surface subsidence. In this study, Yuanbao Bay Coal Mine, Shuozhou, Shanxi, was selected to study the collapse of the overlying coal pillars on the longwall face and reveal the mechanism of the pillar collapse and the disaster-causing mechanism caused by strong ground pressure. Results show that the dynamic collapse process of coal pillars is relatively complicated. First, the coal pillars on both sides of the goaf are destroyed and destabilized, followed by the adjacent coal pillars, which eventually cause a large-scale collapse of the coal pillars. This results in a large-scale cut-off movement of the overlying strata, and the large impact load that acts on the longwall face causes an unmovable longwall face support. Moreover, the roof weighting is severe when strong ground pressure occurs on the longwall face, causing local support jammed accidents. Furthermore, the data of each measurement point of the strata movement inside the ground borehole significantly increases, and the position of the borescope peeping error holes in the ground drill hole rise steeply. The range of movement of the overlying strata increases instantaneously, and the entire strata begin to move. Research on the mechanism of strong ground pressure can effectively prevent mine safety accidents and avoid huge economic losses.
Highlights
Coal, which is one of the main energy sources of China, plays a significant role inChina’s energy consumption structure
The abnormal stress field and movement of the overlying strata in the stope causes the appearance of abnormal ground pressure, resulting in the increasing attention that close-distance coal seam mining has received in recent years [6,7]
Bay 6107 longwall face [2,3,41] as the study location in order to investigate the stability of the coal pillar in undermining conditions using the adopted experimental method
Summary
Coal, which is one of the main energy sources of China, plays a significant role in. China’s energy consumption structure. Existing and upper coal seams with simple geological conditions have been mined due to the intensive mining activities in recent years, and the mining process of the close-distance lower coal seam has been inevitably affected in secondary mining This multiple-seam mining [2,3,4,5] causes an increase in the overburden movement range and surface damage. Wang et al [36] comprehensively considered the factors influencing the stability of the interburden and adopted the safety factor method to evaluate the stability of the interburden in order to ensure the safe mining of a coal seam that overlies the knife-pillar goaf area. Bay 6107 longwall face [2,3,41] as the study location in order to investigate the stability of the coal pillar in undermining conditions using the adopted experimental method. This study represents an important contribution to the prevention and control of support crushing disasters by putting forward effective measures and countermeasures to guarantee the safety of mine personnel, equipment, and facilities by predicting the initial location of an occurrence of strong ground pressure and carrying out effective prevention and control through methods like hydraulic fracturing to solve the vulnerabilities in advance
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