Study on surrounding rock control of roadways in deep coal mines based on roof cutting and pressure release technology by directional tensile blasting #br#
(1. State Key Laboratory for Geomechanics and Deep Underground Engineering，China University of Mining and Technology(Beijing)，Beijing 100083，China；2. School of Mechanics and Civil Engineering，China University of
Mining and Technology(Beijing)，Beijing 100083，China)
Abstract：Roadway safety is related to the high productivity and high efficiency of coal mining，and the stability control of roadways in deep coal mines is particularly important. Based on the engineering background of 3－1101 working face of Hongqinghe coal mine，the mechanism of surrounding rock deformation in high-stress roadways was analyzed，and a surrounding rock control technology for deep roadways by directional roof cutting and pressure release was then proposed. The applicability of the technology was studied using numerical modeling and field experiment. It was found that the directional roof cutting and pressure release technology can help to optimize the stress environment of the roadway by artificially controlling the overburden structure without destroying the stability of the roadway. For different roof cutting effects，however，the caving shape，stress distribution and deformation characteristics of the entry surrounding rock are different. Numerical simulations show that，within a certain range，increasing the roof cutting height is beneficial to promote the collapse of the gob roof strata，to reduce the suspended roof length and to diminish the overburden load which was transmitted from the gob roof to the solid coal. Enhancing the roof cutting effect can reduce the deformation of the roadway and accelerate the stability of the entry surrounding rock. Field experiments show that，with enhancing the roof cutting effect，the peak stress and stabilized stress in the coal body decrease，the distance to be stabilized behind the working face is shortened and the deformation and deformation rate of the surrounding rock are reduced. Application of the proposed technology in practice indicates that the large deformation problem of surrounding rock in deep high-stress roadway is effectively solved.
高玉兵1，2，杨 军1，2，张星宇1，2，薛浩杰1，2，何满潮1. 深井高应力巷道定向拉张爆破切顶卸压围岩控制技术研究[J]. 岩石力学与工程学报, 2019, 38(10): 2045-2056.
GAO Yubing1，2，YANG Jun1，2，ZHANG Xingyu1，2，XUE Haojie1，2，HE Manchao1. Study on surrounding rock control of roadways in deep coal mines based on roof cutting and pressure release technology by directional tensile blasting #br#. , 2019, 38(10): 2045-2056.
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2019, Vol. 38 
