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Ground Control Method of Using Roof Cutting Pressure Release and Energy-Absorbing Reinforcement for Roadway with Extra-Thick Hard Roof

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Abstract

Coal mining in the western region of China is often faced with extra-thick coal seams and extra-thick hard roof, where the roof is difficult to collapse in time, resulting in large-suspended area in the gob and the frequent occurrence of dynamic disasters such as mine earthquakes. To this end, we propose an integrated ground control method of roof cutting pressure release and energy-absorbing reinforcement for roadway with hard roof. We take the #122108 working face of the Caojiatan coal mine as the engineering example to apply this new method. The stress reduction rate is used to analyze the pressure relief effect. The influence of pressure relief parameters on the roadway is analyzed through numerical experiments. Three-dimensional stress evolution of the surrounding rock using the optimized parameters is further studied, which verifies the advantages of the new method, as evidenced by the reduction of stress up to 40.87%. Moreover, we conduct physical model test of the new method and reveal the control mechanism on the surrounding rock. The deformation of the roof and floor of roadway with roof cutting is lower than that of the roadway without roof cutting and the maximum deformation is reduced by 52.26%. Subsequently, we design the field roof cutting parameters for pressure release and energy-absorbing reinforcement, and evaluate the parameters of roof cutting, strengthen blasting, and energy-absorbing cables. Field monitored data show that the average deformation of the roadway floor using the new method is 201.8 mm, which is 66.37% smaller than that of roadway without using the new method, and the peak stress at the working face is 27.75% less than that without using the new method. The validity of the physical model test results and the rationality of the design parameters for pressure relief and reinforcement is verified through the field data.

Highlights

  • An integrated ground control method of roof cutting pressure release and energy-absorbing reinforcement for roadway with hard roof is proposed.

  • The design basis and control mechanism of roof cutting pressure release and energy-absorbing reinforcement parameters for thick hard roof roadway are clarified by numerical and large-scale 3D geological model tests.

  • The design and field application of core parameters of directional roof cutting pressure release and energyabsorbing reinforcement have been successfully carried out.

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The authors confirm that the data supporting the findings of this study are available within the article.

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Acknowledgements

This work was supported by the National Natural Science Foundation of China (Grant nos. 52074164, 42277174 and 42077267); the Natural Science Foundation of Shandong Province, China (Grant no. ZR2020JQ23); the Project of Shandong Province Higher Educational Youth Innovation Science and Technology Program, China (Grant no. 2019KJG013); the Fundamental Research Funds for the Central Universities, China (Grant no. 2022JCCXSB03); and the opening project of State Key Laboratory of Explosion Science and Technology, Beijing Institute of Technology (Grant no. KFJJ21-02Z).

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Authors and Affiliations

  1. State Key Laboratory for Geo-Mechanics and Deep Underground Engineering, China University of Mining and Technology-Beijing, Beijing, 100083, China

    Qi Wang, Zhenhua Jiang, Bei Jiang, Manchao He, Jun Yang & Haojie Xue

  2. State Key Laboratory of Explosion Science and Technology, Beijing Institute of Technology, Beijing, 100081, China

    Qi Wang & Bei Jiang

  3. Research Center of Geotechnical and Structural Engineering, Shandong University, Jinan, 250061, China

    Qi Wang, Zhenhua Jiang & Haojie Xue

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  1. Qi Wang
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  2. Zhenhua Jiang
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  3. Bei Jiang
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  4. Manchao He
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  5. Jun Yang
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Correspondence to Bei Jiang.

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Wang, Q., Jiang, Z., Jiang, B. et al. Ground Control Method of Using Roof Cutting Pressure Release and Energy-Absorbing Reinforcement for Roadway with Extra-Thick Hard Roof. Rock Mech Rock Eng 56, 7197–7215 (2023). https://doi.org/10.1007/s00603-023-03461-6

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