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A Novel Method of Combined Deep Hole Blasting for Gob-Side Roadway Protection

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Abstract

With the deterioration of mining conditions, the stability of roadway has become an important research topic for safe and efficient production in coal mines. To protect the gob-side roadway from dynamic mining disturbance under the condition of thick and hard roof so as to ensure the stability of roadway, an innovative method of combined deep hole blasting (CDHB) is proposed. The CDHB method consists of directional energy-gathering blasting and non-directional blasting. By means of theoretical analysis, numerical simulation and field test, the mechanism and effect of the method to protect roadway are analyzed. The research results show that due to the pressure relief principle of the directional energy-gathering blasting technology, the coal mass stress on the side of coal pillar in the roadway is reduced, and the stress concentration area is far away from the roadway. At the same time, owing to the principle of broken expansion filling of non-directional blasting, the collapsed gangue can fill the goaf and support the roof, thus reducing the coal mass stress in front of the working face and at the side of the roadway coal pillar. Finally, the combination of the two blasting methods successfully reduces the coal mass stress of the two sides of the roadway in front of the working face, optimizes the stress environment of the roadway and achieves the goal of protecting the roadway. The effectiveness of the CDHB method is verified by field tests, in which the stress and deformation of the surrounding rock of the roadway are significantly reduced. The research results provide a scientific basis for roadway deformation control under similar conditions.

Highlights

  • A new CDHB method is proposed based on characteristics of rock.

  • Protecting roadway by pressure relieve and increasing coefficient of broken expansion.

  • Comprehensive monitoring showed that CDHB method effectively protects gob-side roadways.

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Data Availability

Some or all data, models, or code that support the findings of this study are available from the corresponding author upon reasonable request.

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Acknowledgements

The authors wish to acknowledge the funding support from Fund Project: Project supported by the National Natural Science Foundation of China (Grant No. 52074298), China Postdoctoral Science Foundation (Grant No. 2020T130702), National Key Research and Development Program (Grant No. 2018YFC0603705), and Yue Qi Outstanding Scholar Award Program of China University of Mining and Technology, Beijing (Grant No. 800015Z1171), which are 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, 100083, China

    Jun Yang, Qiang Fu, Yubing Gao, Xing Wu, Xu Chang & Changjiang Li

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

    Jun Yang, Qiang Fu, Yubing Gao, Xing Wu, Xu Chang & Changjiang Li

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  1. Jun Yang
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  2. Qiang Fu
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  3. Yubing Gao
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  4. Xing Wu
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  5. Xu Chang
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  6. Changjiang Li
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Correspondence to Qiang Fu.

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Yang, J., Fu, Q., Gao, Y. et al. A Novel Method of Combined Deep Hole Blasting for Gob-Side Roadway Protection. Rock Mech Rock Eng 56, 3551–3571 (2023). https://doi.org/10.1007/s00603-023-03234-1

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  • DOI: https://doi.org/10.1007/s00603-023-03234-1

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