Analysis of Main Controlling Factors of Overburden Failure in Coal Mining Under Thick Coal Seam Geological Conditions
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ORIGINAL PAPER
Analysis of Main Controlling Factors of Overburden Failure in Coal Mining Under Thick Coal Seam Geological Conditions Lifu Pang
. Weitao Liu . Yueyun Qin
Received: 23 June 2020 / Accepted: 21 August 2020 Springer Nature Switzerland AG 2020
Abstract According to the theory of elastic mechanics half plane, the mechanical model of roof overburden failure is established. Based on the numerical simulation software FLAC3D, the failure process of roof overburden in 1308 working face is numerically simulated according to the orthogonal experimental design scheme. Matrix analysis and variance analysis are used to analyze and calculate the simulation results to determine the sensitivity of the main control factors to the failure height of overlying rock of mining roof. The results show that: (1) with the increase of mining depth and the advancing distance of working face, the subsidence of roof overburden increases. (2) The order of influence of main controlling factors on roof overburden failure height is: mining depth [ working face length [ internal friction angle [ mining thickness [ coal seam dip angle [ cohesion [ tensile
L. Pang (&) W. Liu College of Energy and Mining Engineering, Shandong University of Science and Technology, Qingdao 266590, Shandong, China e-mail: [email protected] L. Pang W. Liu Y. Qin Shandong University of Science and Technology State Key Laboratory of Mine Disaster Prevention and Control, Qingdao 266590, Shandong, China Y. Qin College of Safety and Environmental Engineering, Shandong University of Science and Technology, Qingdao 266590, Shandong, China
strength. (3) Variance analysis showed that the mining depth height was significant, the working face length and internal friction angle were significant, and the significance of working face length was slightly greater than that of internal friction angle, and other factors were not significant. Keywords Thick coal seam Overburden failure Main controlling factors Orthogonal test
With the development of coal mining depth in our country, the thickness of coal seam is becoming thicker and thicker. The occurrence of roof water permeability accidents is more frequent, which poses a great threat to the safe and efficient mining of deep thick coal seam (Zhang et al. 2011; Wang et al. 2012; Liu et al. 2020). Therefore, it is particularly important to study the deformation and failure law of coal seam overburden (Yuan et al. 2013; Yang et al. 2016; Coggan et al. 2012). And the failure height of overburden is an important factor affecting roof water permeability (Wang et al. 2019). At present, there are mainly three kinds of detection methods for overburden failure height (Yang et al. 2007; Yu et al. 2007). The first one is actual detection method, including water injection experiment method, ultrasonic imaging method, acoustic CT tomography method (Xu et al. 2009; Liu et al. 2013a, b; Qiu et al. 2018). The second one is theoretical calculation and
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Geotech Geol Eng
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