Research on Static Fracturing Roof Caving Technology for Hard Immediate Roof at the Open-off Cut of 15221 Fully Mechanized Mining Face in Hongliulin Coal Mine

YeXin Li

doi:10.63313/AERpc.9080

Authors

YeXin Li School of Energy Science and Engineering, Henan Polytechnic University, Jiaozuo 454000, China Author

DOI:

https://doi.org/10.63313/AERpc.9080

Keywords:

Static fracturing, Hard immediate roof, Open-off cut, Strata pressure control, Initial roof caving

Abstract

Aiming at the engineering challenge that the hard immediate roof at the open-off cut of the 15221 fully mechanized mining face in Hongliulin Coal Mine is extremely prone to forming a large-area suspended roof and inducing dynamic strata pressure disasters during the initial mining period, this paper conducted an engineering experimental study on the static fracturing roof caving technology for hard immediate roofs. By drilling pre-splitting boreholes in the open-off cut and two gateways of the 15221 working face and injecting expansive cartridges, the roof caving characteristics, working resistance of supports, wind speed, and dust concentration changes before and after fracturing were analyzed. The results show that the static fracturing technology effectively severed the integrity of the hard roof, and the initial weighting step was controlled at 43.5 m. The over-limit ratio of support pressure dropped to 0.5%, effectively avoiding the risk of support crushing, and the average dust concentration in the working face was significantly reduced, achieving safe, efficient, and green roof caving.

References

[1] Zhang, J.W., Song, Z.X., Liu, J.L., et al. (2022) Structural Control Technology Framework for Rock Burst Disasters in Deep Coal Mining. Coal Science and Technology, 50, 27-36.

[2] Guo, L.L. (2025) Research on Ground Pressure Control and Support Technology in Deep Coal Mining. Coal New Vision, 292-294.

[3] Guo, R. (1987) Application of Static Expansive Agents. Chemical Mining Technology, 24-25.

[4] Jin, B., Zuo, Y.J., Lin, J.Y., et al. (2021) Study on the Activation Characteristics of Reverse Faults under Different Roof Lithological Combination Structures. China Mining Magazine, 30, 172-180.

[5] Guo, F.C., Zheng, H.X., Liu, C.Y., et al. (2024) Research on Static Fracturing Technology for Suspended Roof at the Face End of 25213 Fully Mechanized Mining Face in Hongliulin Mining. Mining Technology, 24, 58-62.

[6] Meng, X.G. and Chen, Y.L. (2024) Optimization and Application of Blasting Roof Cutting Technology at the Open-off Cut of Fully Mechanized Caving Face. Energy Technology and Management, 49, 61-63, 162.

[7] Chen, J.G. and Zhuo, J. (2021) Roof Control Technology and Gas Prevention Measures During the Initial Mining Period of Fully Mechanized Mining Face. Coal Technology, 40, 113-116.

[8] Li, M.Z. (2024) Study on Rock Breaking Law and Engineering Application of Static Cracking Agents. Master's Thesis, Henan Polytechnic University, Jiaozuo.