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A Novel Method of Roadway Floor Deformation Control by Deep-Hole Directional Tension Blasting—A Case Study

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Abstract

With the development of underground mining, the deformation of roadway floor has increasingly become a major constraint on the safe and efficient production of coal mines. To address the floor deformation that was caused by massive stress concentration in roadway, an innovative method based on deep-hole directional tensile blasting technology is put forward. By taking No.122108 working face in Caojiatan Coal Mine as engineering background and analyzing the mechanism of deformation, a numerical simulation and field test are carried out to verify the effect on deformation control of this technology. It is found that the deep-hole directional tensile blasting technology can actively control the fracture position of the roof in the gob area and cut off the stress transmission path, so as to relieve the stress in the roadway. And since different blasting parameters have different impacts on the stress relief effect, a numerical simulation is implemented and it is found that the stress relief effect is the best when blasting depth is set to be 32 m and the blasting angle be 60°. By applying the optimal blasting parameters to the field engineering test, it can be seen that the deep-hole directional tensile blasting technology could effectively reduce maximum stress value and stress field range of the both sides of the roadway, and make the stress field far away from the roadway, thus effectively controlling the deformation of the roadway floor. The deep-hole directional tensile blasting technology can effectively solve the problem of roadway floor deformation and can be safely applied to engineering sites.

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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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Funding

The authors wish to acknowledge the funding support from Fund Project: Project supported by the National Natural Science Foundation of China (Grant No. 52204164), Project supported by the National Natural Science Foundation of China (Grant No. 52074298), Fundamental Research Funds for the Central Universities (Grant No. 2022XJSB03), Young Elite Scientists Sponsorship Program by CAST (Grant No. 2021QNRC001), National Key Research and Development Program (Grant Nos. 2018YFC0603705), Yue Qi outstanding scholar award program of China University of Mining & Technology, Bei**g (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 (Bei**g), Bei**g, 100083, China

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

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

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

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  1. Jun Yang
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Correspondence to Yubing Gao.

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Yang, J., Fu, Q., Gao, Y. et al. A Novel Method of Roadway Floor Deformation Control by Deep-Hole Directional Tension Blasting—A Case Study. Mining, Metallurgy & Exploration 40, 1121–1140 (2023). https://doi.org/10.1007/s42461-023-00790-6

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