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학술저널
저자정보
Song, Dazhao (School of Safety Engineering, China University of Mining and Technology) Wang, Enyuan (School of Safety Engineering, China University of Mining and Technology) Xu, Jiankun (School of Mines, China University of Mining and Technology) Liu, Xiaofei (School of Safety Engineering, China University of Mining and Technology) Shen, Rongxi (Shaanxi Coal and Chemical Technology Institute Co., Ltd.) Xu, Wenquan (Shaanxi Coal and Chemical Technology Institute Co., Ltd.)
저널정보
테크노프레스 Geomechanics & engineering Geomechanics & engineering 제8권 제4호
발행연도
2015.1
수록면
495 - 510 (16page)

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The applications of water jet cutting (WJC) in coal mine have progressed slowly. In this paper, we analyzed the possibility and reasonableness of WJC application to pressure relief in hard coal seam, simulated the distributive characteristics of stress and energy fields suffered by hard coal roadway wallrock and the internal relationships of the fields to the instability due to WJC (including horizontal radial slot and vertical annular slot) on roadway wallrock. The results showed that: (1) WJC can unload hard coal seam effectively by inducing stress release and energy dissipation in coal mass near its slots; its annular slots also can block or weaken stress and energy transfer in coal mass; (2) the two slots may cause "the beam structure" and "the small pillar skeleton", and "the layered energy reservoir structure", respectively, which lead to the increase in stress concentration and energy accumulation in coal element mass near the slots; (3) the reasonable design and optimization of slots' positions and their combination not only can significantly reduce the scope of stress concentration and energy accumulation, but also destroy coal mass structure on a larger scale to force stress to transfer deeper coal mass.

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