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Research on Roof Cutting and Pressure Releasing Technology of Cumulative Blasting in Deep and High Stress Roadway

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Abstract

Affected by high in-situ stress and mining activities, In the original support scheme, entry of guotun coal mine is seriously deformed. The side of the head entry bulges out seriously and the roof sinks seriously. In order to solve the problem of large deformation of roadway, guotun coal mine adopts the technology of a nonpillar mining method with entry automatically retained in 4306 mining face. First, taking method of theoretical analysis, the stress model of blasthole under the deep condition is established, the mechanical conditions of crack propagation under the action of directional detonation wave and high surrounding rock binding force are obtained theoretically. Next, the mechanical model of roof cutting and pressure relief is established. Afterwards, The mechanical model of directional blasting under the condition of stress constraint is established by using LS-DYNA numerical calculation software, the evolution characteristics of effective stress and the law of crack growth are analyzed. In the end, the field test was carried out in 4306 mining face, and the blasting effect was observed by drilling peep, and the deformation of the head entry before and after pressure relief was monitored and analyzed. The results show that directional fracture blasting can produce a continuous crack, and the effect of pressure relief is remarkable, effectively controlling the deformation of surrounding rock under high in-situ stress.

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Acknowledgements

This work is supported by the Project funded by China Postdoctoral Science Foundation (No. 2020T130702), which is gratefully acknowledged.

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Authors and Affiliations

  1. State Key Laboratory for Geomechanics and Deep Underground Engineering, China University of Mining and Technology (Beijing), Beijing, China

    Xiaojie Yang, Di Yuan, Haojie Xue, Yubing Gao, Xichun Tian, Jingchen Qi, Lin Hou & Jindong Cao

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

    Di Yuan, Haojie Xue, Yubing Gao, Xichun Tian, Jingchen Qi, Lin Hou & Jindong Cao

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  1. Xiaojie Yang
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  2. Di Yuan
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  3. Haojie Xue
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  4. Yubing Gao
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  5. Xichun Tian
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  6. Jingchen Qi
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  7. Lin Hou
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  8. Jindong Cao
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Correspondence to Yubing Gao.

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Yang, X., Yuan, D., Xue, H. et al. Research on Roof Cutting and Pressure Releasing Technology of Cumulative Blasting in Deep and High Stress Roadway. Geotech Geol Eng 39, 2653–2667 (2021). https://doi.org/10.1007/s10706-020-01649-z

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  • DOI: https://doi.org/10.1007/s10706-020-01649-z

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