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Combined blasting for protection of gob-side roadway with thick and hard roof

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The deformation control of surrounding rock in gob-side roadway with thick and hard roof poses a significant challenge to the safety and efficiency of coal mining.To address this issue,a novel approach combining directional and non-directional blasting techniques,known as combined blasting,was pro-posed.This study focuses on the experimental investigation of the proposed method in the 122108 working face in Caojiatan Coal Mine as the engineering background.The initial phase of the study in-volves physical model experiments to reveal the underlying mechanisms of combined blasting for protecting gob-side roadway with thick and hard roof.The results demonstrate that this approach effectively accelerates the collapse of thick and hard roofs,enhances the fragmentation and expansion coefficient of gangue,facilitates the filling of the goaf with gangue,and provides support to the overlying strata,thus reducing the subsidence of the overlying strata above the goaf.Additionally,the method involves cutting the main roof into shorter beams to decrease the stress and disrupt stress transmission pathways.Subsequent numerical simulations were conducted to corroborate the findings of the physical model experiments,thus validating the accuracy of the experimental results.Furthermore,field engi-neering experiments were performed,affirming the efficacy of the combined blasting method in miti-gating the deformation of surrounding rock and achieving the desired protection of the gob-side roadway.

Thick and hard roofSurrounding rock controlCombined blastingFragmentation and expansion support stress relief

Qiang Fu、Jun Yang、Yubing Gao、Changjiang Li、Hongxu Song、Yuxuan Liu、Xing Wu

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State Key Laboratory for Tunnel Engineering,China University of Mining and Technology(Beijing),Beijing,100083,China

School of Mechanics and Civil Engineering,China University of Mining and Technology(Beijing),Beijing,100083,China

National Natural Science Foundation of ChinaNational Natural Science Foundation of ChinaFundamental Research Funds for the Central Universities

52074298522041642022XJSB03

2024

10.1016/j.jrmge.2023.11.027

岩石力学与岩土工程学报(英文版)
中国科学院武汉岩土力学所中国岩石力学与工程学会武汉大学

岩石力学与岩土工程学报(英文版)

CSTPCD
影响因子：0.404
ISSN：1674-7755
年,卷(期)：2024.16(8)
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