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| APPLICATION OF DEEP BOREHOLE BLASTING TO GOB-SIDE
ENTRY RETAINING FORCED ROOF CAVING IN HARD AND
COMPOUND ROOF DEEP WELL |
| GAO Kui1，LIU Zegong1，2，LIU Jian1，2，DENG Dongsheng3，GAO Xinya4，KANG Ya1，HUANG Kaifeng1 |
(1. School of Mining and Safety Engineering，Anhui University of Science and Technology，Huainan，Anhui 232001，China；2. Key Laboratory of Mine Safety and High Efficient Mining Jointly Built by Province and Education Ministry，Anhui University of Science and Technology，Huainan，Anhui 232001，China；3. State Key Laboratory of Deep Coal Mining and Environmental Protection，
Anhui University of Science and Technology，Huainan，Anhui 232001，China；4. East Area of Panyi Coal Mine，
Huainan Mining Group Co.，Ltd.，Huainan，Anhui 232001，China) |
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Abstract In order to prevent the filling wall along gob-side entry retaining being crushed when roof caves in deep well，the deep borehole blasting forced roof caving was taken to release the roof pressure and improve the supporting roadway gob-side entry retaining effect. The pressure relief mechanism of deep borehole blasting to forced roof caving was expounded by numerical simulation and theoretical analysis method. After dynamite blasting in hard rock，the surrounding rock of blasting boreholes produces a large number of fissures and the significant displacement by the explosion stress waves；and stresses were redistributed. So the additional load of filling body and the deformation of the surrounding rock were reduced which play the role of supporting roadway. Finally，in the working face 1252(1) of eastern area of Panyi coal mine，the deep borehole blasting was applied to forced roof caving field test；and the filling wall kept stable after mining. It provides a good reference for gob-side entry retaining under similar conditions.
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Received: 24 January 2013
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LI Botao1, 2, 3, TAN Yuxuan1, LIN Haifei4, 5*, WEI Jianping1, 2, 3, ZHANG Hongtu1, 2, 3, LI Shugang4, 5, WEI Zongyong4, 5, WANG Pei4, LUO Rongwei4, LIU Yanwei1, 2, 3. Mechanical properties and mesoscopic damage evolution of coal under liquid-nitrogen freezing at different initial temperatures[J]. , 2026, 45(6): 1757-1772. |
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2013, Vol. 32 
