大倾角煤层开采覆岩应力场形成及演化特征.pdf

32 8 2013 8 Vol.32 No.8 Journal of Liaoning Technical University Natural Science Aug. 2013 2012-12-19 51074120 51204132 03166 11JK0785 1983- . 1008-0562201308-1022-05 doi10.3969/j.issn.1008-0562.2013.08.003 1,21,21,2 1. 710054 2. 710054 . . . . TD 323 A ation and evolution characteristics of rock stress field in steeply dipping seam mining WANG Hongwei1,2, WU Yongping1, XIE Panshi1,2 1.Key Laboratory of Western Mine Exploitation and Hazard Prevention Ministry of Education, Xi’an 710054, China; 2.School of Mineral Engineering, Xi’an University of Science and Technology, Xi’an 710054, China Abstract The researches on ation and evolution of stress field of surrounding rocks have been made to improve the mining technology in steeply dipping coal seams. The results of study show that stress redistribution of surrounding rock occurs in steeply dipping seam mining, the routes of stress transation shift and stress arch shell is ed in three-dimensional space.The evolution morphology of which could be determined by discriminate coefficient.With the face advancing,stress arch shell extends to the periphery rock and its non-symmetrical nature strengthened gradually. The flat ratio of stress arch increases gradually along coal seam when it decreases gradually along coal tendency, and the maximum height position of stress arch continues to shift to the side of return airway.The results above provide a theoretical basis for the safe and efficient mining in steeply dipping seam. Key words steeply dipping seam; numerical calculation; stress distribution; abutment pressure; stress arch-shell; non-symmetrical; evolution characteristics; discriminate coefficient 3555 . 1520 10[1]. . . .[2-10] .