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Research on Roof Cutting and Pressure Releasing Technology of Directional Fracture Blasting in Dynamic Pressure Roadway

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Abstract

Affected by mining activities, 3−1103 tailgate of Hongqinghe coal mine is seriously deformed. The floor of tailgate cracking and tilting, and two ribs appearing in the net bag, which affects normal transportation and pedestrians. To solve this difficulty, this paper study on the technology of directional fracturing blasting for pressure relief of dynamic pressure roadway. First of all, taking method of theoretical analysis, the mechanical mechanism of directional blasting and the relevant calculation formula are expounded. Afterwards, the mechanical model of roof cutting of roadway is established. In order to analyze the evolution and propagation of effective stress, directional blasting model is established by using LS-DYNA numerical calculation software. In the next part, the roof control technology of directional cut blasting is put forward. In the end, the blasting effect is observed, and the deformation of the roadway before and after pressure relief is monitored and analyzed. The results shows that directional fracture blasting have obvious effect of joint formation, and the effect of pressure relief is remarkable, effectively controlling the deformation of surrounding rock under dynamic pressure.

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Acknowledgements

This work was supported in part by the State Key Laboratory of Deep Geomechanics and Underground Engineering and School of Mechanics and Civil Engineering (China University of Mining and Technology, Beijing), the National Natural Science Foundation of China (No. 41672347) and Natural Science Foundation of Beijing Municipality (No. 8142032). We also express our thanks to the reviewers for their time and effort on reviewing this paper.

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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, People’s Republic of China

    XiaoJie Yang, ChenKang Liu & XingYu Zhang

  2. School of Mechanics and Civil Engineering, China University of Mining and Technology, Beijing, Ding 11 Xueyuan Road Haidian District, Beijing, 100083, People’s Republic of China

    XiaoJie Yang, ChenKang Liu & XingYu Zhang

  3. Shandong Provincial Key Laboratory of Civil Engineering Disaster Prevention and Mitigation, Shandong University of Science and Technology, 579 Qianwangang Road Economic & Technical Development Zone, Qingdao, 266590, Shandong, People’s Republic of China

    YuGuo Ji

  4. School of Chemical and Environmental Engineering, China University of Mining and Technology, Beijing, Ding 11 Xueyuan Road Haidian District, Beijing, 100083, People’s Republic of China

    Shuai Wang

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  1. XiaoJie Yang
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  2. ChenKang Liu
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  3. YuGuo Ji
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  4. XingYu Zhang
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  5. Shuai Wang
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Correspondence to ChenKang Liu.

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Yang, X., Liu, C., Ji, Y. et al. Research on Roof Cutting and Pressure Releasing Technology of Directional Fracture Blasting in Dynamic Pressure Roadway. Geotech Geol Eng 37, 1555–1567 (2019). https://doi.org/10.1007/s10706-018-0707-4

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  • DOI: https://doi.org/10.1007/s10706-018-0707-4

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