326 the intensity of strata pressure behavior during periodic weighting was significantly alleviated. The average and maximum retractions of hydraulic support legs decreased by 33.3% and 23.4%, respectively. The proportion of periods with an average dynamic load coefficient greater than 1.5 decreased by 25.6%. Rib spalling was concentrated within 0.2– 0.5 m, within a controllable range. Acknowledgments This work was supported by the National Key Research and Development Program of China (Grant No. 2023YFC2907502), the National Natural Science Foundation of China (Grant No. 52404129), and the Science and Technology Innovation Fund of CCTEG Coal Mining Research Institute (Grants No. KCYJY-2026-ZD-01, KCYJY-2025-MS-04). The authors thank Dr. HUANG Zhizeng, Dr. ZHANG Zhen, Dr. LIU Xiaogang, Dr. LIU Qianjin, and Mr. LI Shaopeng for their assistance in strata pressure monitoring and field data collection. References: [1] AMADEI B, STEPHANSSON O. Rock stress and its measurement[M]. London: Chapman and Hau, 1997. [2] CHEN Dongdong, SUN Siqing, ZHANG Jian, et al. Technical system and engineering practice of coal seam permeability improvement through underground directional long borehole hydraulic fracturing[J]. Coal Science and Technology, 2020, 48(10): 84−89. [3] CHEN Zuo, XU Guoqing, JIANG Manqi. The current status and development recommendations for dry hot rock fracturing technologies at home and abroad [J]. Petroleum Drilling Techniques, 2019, 47(6): 1-8. [4] ECONOMIDES M J, NOLTE K G. Reservoir stimulation[M]. 3rd ed. New York: Wiley, 2000. [5] KANG Hongpu, FENG Yanjun, ZHANG Zhen, et al. Hydraulic fracturing technology with directional boreholes for strata control in underground coal mines and its application[J]. Coal Science and Technology, 2023,51(1): 31-44. [6] KANG Hongpu, GAO Fuqiang. Evolution of mining-induced stress and strata control in underground coal mines[J]. Chinese Journal of Rock Mechanics and Engineering, 2024, 43(1): 1-40. [7] KANG Hongpu, JIANG Pengfei, HUANG Bingxiang, et al. Roadway strata control technology by means of bolting-modification- destressing in synergy in 1 000 m deep coal mines[J]. Journal of China Coal Society, 2020, 45(3): 845-864. [8] KANG Hongpu, LEI Yajun, ZHAO Futang, et al. Key technology and equipment for fully mechanized mining with extra-large shearing height of 10 m in extra-thick coal seam[J]. Journal of China Coal Society, 2025, 50(4): 1849-1875. [9] KANG Hongpu, XU Gang, WANG Biaomou, et al. Forty years development and prospects of underground coal mining and strata control technologies in China[J]. Journal of Mining and Strata Control Engineering, 2019, 1(1): 013501. [10] LEI Yajun, FENG Yanjun, KANG Hongpu, et al. Research and application of pressure relief technology for fracturing thick hard roof in super-high mining face[J]. Journal of China Coal Society, 2025, 50(4): 1907-1934. [11] MISKIMINS J L. Hydraulic fracturing: fundamentals and advancements[M]. Richardson, Texas: Society of Petroleum Engineers, 2019. [12] MONTGOMERY C T, SMITH M B. Hydraulic fracturing: history of an enduring technology[J]. Journal of Petroleum Technology, 2010, 62(12): 26-40. [13] WANG Rui, XU Gang, KANG Hongpu, et al. Surrounding rock control technology of 10 m super large mining height working face in Caojiatan Coal Mine [J]. Journal of China Coal Society, 2025, 50(4): 1935-1950. [14] XU Gang, ZHANG Zhen, ZHANG Chunhui, et al. Review on roof disaster and prevention technology for coal mining face in China[J]. 2024, 6(5): 053028. [15] ZHENG Kaige, GUO Wei, ZHANG Jian, et al. Key technical equipment and
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