Strata behavior investigation for high-intensity mining in the water-rich coal seam

• Published in: 矿业科学技术学报（英文版） no. 3; pp. 298 - 303
• Main Authors: Ding Huande, Miao Xiexing, Ju Feng, Wang Xiulin, Wang Qingcang
• Format: Journal Article
• Language: English
• Published: School of Mines, China University of Mining&Technology, Xuzhou 221116, China%State Key Laboratory for Geomechanics and Deep Underground Engineering, China University of Mining&Technology, Xuzhou 221116, China 2014
• Subjects: Strata behaviors; Strata movement; Coal seam under aquifer; High-intensity mining
• ISSN: 2095-2686

This paper describes a specific case of mining in a water-rich coal seam in western China. Water inrushes, roof caving and other disasters induced by intensive mining operation could pose great threats to the safety of coal mines. The strata behavior during the high-intensity extraction in the water-rich coal seam is analyzed by employing the numerical simulation method and in situ monitoring. The results show that about 10 m ahead of the workface, the front abutment pressure peaks is at 34.13 MPa, while the peak of the side abutment pressure is located about 8 m away from the gateway with the value of 12.41 MPa;the height of the fracture zone, the first weighting step and the cycle weighting step are calculated to be 45, 50 and 20.8 m, respectively; pressure distribution in the workface is characterized by that the vertical pressure in the center occurs earlier and is stronger than those on both ends. Then, the results above are verified by in situ measurement, which may provide a basis for safe mining under similar conditions.