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Directional Blasting Fracturing Technology for the Stability Control of Key Strata in Deep Thick Coal Mining

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  • Haojie Xue

    (State Key Laboratory for Geomechanics and Deep Underground Engineering, China University of Mining & Technology (Beijing), Beijing 100083, China
    School of Mechanics and Civil Engineering, China University of Mining & Technology (Beijing), Beijing 100083, China)

  • Yubing Gao

    (State Key Laboratory for Geomechanics and Deep Underground Engineering, China University of Mining & Technology (Beijing), Beijing 100083, China
    School of Mechanics and Civil Engineering, China University of Mining & Technology (Beijing), Beijing 100083, China)

  • Xingyu Zhang

    (State Key Laboratory for Geomechanics and Deep Underground Engineering, China University of Mining & Technology (Beijing), Beijing 100083, China
    School of Mechanics and Civil Engineering, China University of Mining & Technology (Beijing), Beijing 100083, China
    Department of Civil, Environmental and Architectural Engineering, University of Colorado, Boulder, CO 80309, USA)

  • Xichun Tian

    (State Key Laboratory for Geomechanics and Deep Underground Engineering, China University of Mining & Technology (Beijing), Beijing 100083, China
    School of Mechanics and Civil Engineering, China University of Mining & Technology (Beijing), Beijing 100083, China)

  • Haosen Wang

    (State Key Laboratory for Geomechanics and Deep Underground Engineering, China University of Mining & Technology (Beijing), Beijing 100083, China
    School of Mechanics and Civil Engineering, China University of Mining & Technology (Beijing), Beijing 100083, China)

  • Di Yuan

    (State Key Laboratory for Geomechanics and Deep Underground Engineering, China University of Mining & Technology (Beijing), Beijing 100083, China
    School of Mechanics and Civil Engineering, China University of Mining & Technology (Beijing), Beijing 100083, China)

Abstract

Under the conditions of high ground stress and mining disturbance, the strata breakage that is induced by mining is severe. Thus, it is critical to investigate the structural characteristics of key strata (KS) in deep thick mining. This study introduces an innovative technology, namely, directional blasting fracturing, in which an energy-gathering tube is installed in a borehole and an explosive is detonated to break the roof in a specified direction. A theory of balanced bulk filling is established based on the requirements of developing a voussoir beam structure, which can be used to effectively evaluate the percentage of bulk filling in gob and to determine to which structure the key strata belongs. Based on this theory, two types of novel structural models in the advancing and lateral directions of the longwall face are established and defined for studying the roof fracturing mechanism. Compared with a cantilever structure, Model C can develop a stable voussoir beam structure, limiting the rotation space of the KS and reducing both the peak abutment pressure and the dynamic disturbance time in the advancing of the longwall face. Model E is defined as when the technology of directional blasting fracturing effectively cuts a stress transfer path into the barrier pillar. The peak abutment pressures on the barrier pillar and auxiliary entry are smaller, and the dynamic disturbance time is shorter, which can effectively improve the stability of the auxiliary entry. The key parameters of directional blasting fracturing are designed and constructed, and they include the roof fracturing height, angle, and charge structure. The field application performance of this innovative technology at the longwall face of 3 −1 101 in Hongqinghe coal mine was evaluated by analyzing the chock pressure stress, the pillar pressure stress, and the deformation of the auxiliary entry during mining, which lays a foundation for the application of this technology in coal mines in China.

Suggested Citation

  • Haojie Xue & Yubing Gao & Xingyu Zhang & Xichun Tian & Haosen Wang & Di Yuan, 2019. "Directional Blasting Fracturing Technology for the Stability Control of Key Strata in Deep Thick Coal Mining," Energies, MDPI, vol. 12(24), pages 1-19, December.
    • Handle: RePEc:gam:jeners:v:12:y:2019:i:24:p:4665-:d:295578
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    References listed on IDEAS

    as
    1. Xingyu Zhang & Liang Chen & Yubing Gao & Jinzhu Hu & Jun Yang & Manchao He, 2019. "Study of An Innovative Approach of Roof Presplitting for Gob-Side Entry Retaining in Longwall Coal Mining," Energies, MDPI, vol. 12(17), pages 1-16, August.
    2. Zhu Li & Jialin Xu & Shengchao Yu & Jinfeng Ju & Jingmin Xu, 2018. "Mechanism and Prevention of a Chock Support Failure in the Longwall Top-Coal Caving Faces: A Case Study in Datong Coalfield, China," Energies, MDPI, vol. 11(2), pages 1-17, January.
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    Cited by:

    1. Hui Liu & Zhenhua Jiang & Wansheng Chen & Fei Chen & Fenglin Ma & Donghao Li & Zhaoyang Liu & Hongke Gao, 2022. "A Simulation Experimental Study on the Advance Support Mechanism of a Roadway Used with the Longwall Coal Mining Method," Energies, MDPI, vol. 15(4), pages 1-10, February.
    2. Shihao Guo & Shanchao Hu & Junhong Huang & Zhihao Gao & Yafei Cheng & Jinming Han & Lei Yang, 2023. "Stability Control Technology for Surrounding Rocks in Gob-Side Entry Driving with Small Coal Pillars under Dynamic Pressure," Energies, MDPI, vol. 16(23), pages 1-24, December.

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