Stress distribution characteristic analysis and control of coal and gas outburst disaster in a pressure-relief boundary
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ORIGINAL PAPER
Stress distribution characteristic analysis and control of coal and gas outburst disaster in a pressure-relief boundary area in protective layer mining Zhen Liu 1,2 & He Yang 1,2,3
&
Weimin Cheng 1,2 & Lin Xin 1,2 & Guanhua Ni 1,2
Received: 14 March 2017 / Accepted: 4 August 2017 # Saudi Society for Geosciences 2017
Abstract Coal and gas outburst disasters in coal seams are becoming more serious as coal mines extend deeper underground in China. Furthermore, the protective coal seam mining technology featured by economic efficiency has been proven to be the most effective and widely applied method for the prevention of coal and gas outburst disasters. However, the determinations of the protective area coal and gas outburst prevention in a pressure-relief boundary area are fundamental issues that research should be focused on. The technical method for determining stress distribution in pressure-relief boundary area during protective coal seam mining is put forward in this paper. The method is based on a stress-seepage coupled relationship within a gas-containing coal seam. The method includes complex lab experiments and on-site measurements at the Qingdong Coal Mine. The final data illustrate that the permeability and vertical stress in the pressure-relief boundary area of the coal sample form a negative exponential function relationship. Additionally, the permeability of the coal sample within the abovementioned area is significantly different compared with that located at the center of the pressure-relief area. In the pressure-relief boundary area, the gas pressure distribution
* He Yang [email protected]
1
College of Mining and Safety Engineering, Shandong University of Science and Technology, 579 Qianwangang Rd, Huangdao District, Qingdao 266590, People’s Republic of China
2
Mine Disaster Prevention and Control-Ministry of State Key Laboratory Breeding Base, Shandong University of Science and Technology, Qingdao 266590, People’s Republic of China
3
College of Mining and Safety Engineering, Shandong University of Science and Technology, Room 225, 579 Qianwangang Rd, Huangdao District, Qingdao 266590, People’s Republic of China
gradient is 0.0375 MPa/m, while the vertical stress distribution gradient registers 0.56 MPa/m. Under this condition, coal and gas outburst disasters are prone to be triggered. Therefore, effective precautions against coal and gas outburst disasters can be put forward in accordance with stress distribution characteristics within the abovementioned Bboundary area.^ Keywords Protective coal seam . Pressure-relief boundary . Stress distribution . Precautions against a coal and gas outburst
Introduction Gas bearing capacity and its pressure increase gradually as coal mine development and mining activities go deeper and deeper. Consequently, this is the reason for more severe coal and gas outburst disasters. The consequences of this kind of disaster are severe. For instance, in February 14, 2005, the Sunjiawan coal mine, located in Fuxin City, Liaoning Province, China,
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