The surrounding rock of the middle-bottom drainage roadway experiences extensive crushing and severe deformation due to the combined effects of mining dynamic pressure and dense gas drainage holes, making its control challenging. Based on the engineering background of 3103 middle bottom drainage roadway in Hebi No.9 Coal Mine, the variation law of vertical stress and displacement of roof and side of bottom drainage roadway with dense boreholes under the influence of mining is revealed by means of field investigation, numerical simulation and theoretical analysis, and reasonable roadway support measures are put forward. The results indicate that as the inclined working face progresses, the vertical stress peak in the surrounding rock of the bottom pumping roadway is observed approximately 10 to 15 meters ahead of the mining face. Mining activities induce asymmetric deformation in the middle and lower sections of the roadway. The right side exhibits a maximum deformation 1.21 times greater than the left side, while the roadway's plastic zone transitions from a horseshoe shape to a butterfly shape. Based on the asymmetric deformation and failure characteristics of the surrounding rock in the bottom drainage roadway, a multi-level coupling control scheme was developed, comprising high-strength prestressed bolts (cables), deep and shallow grouting anchorage, and shotcrete. The approach was successfully implemented in the field, effectively mitigating the uncoordinated deformation of the roadway. This study provides valuable insights for enhancing the stability of surrounding rock and extending the service life of bottom pumping roadways under similar conditions.

Yonghui Wei, Zhiguo Qin, Zhongxin Ji, Tao Wang. Study on the Deformation Law of Surrounding Rock of Middle Bottom Pumping Roadway under the Influence of Close Distance Mining. Academic Journal of Architecture and Geotechnical Engineering (2024) Vol. 6, Issue 4: 137-144. https://doi.org/10.25236/AJAGE.2024.060420.

[1] Kang Hongpu. Seventy years development and prospects of strata control technologies for coal mine roadwaysin China[J]. Chinese Journal of Rock Mechanics and Engineering, 2021, 40(01): 1-30.

[2] Lan Hang, Chen Dongke, Mao Debing. Current status of deep mining and disaster prevention in China[J]. Coal Science and Technology, 2016, 44(1): 39-46.

[3] Liu Hongtao, Han Zijun, Han Zhou, et al. Mechanism of non-uniform expansion and stability control in surrounding rock failure zone due to superimposed mining[J]. Journal of Mining & Safety Engineering, 2024, 41(03): 522-532.

[4] Ding Ziwei, Li Shuai, Zhang Jie, et al. Asymmetric failuer mechanism and control of entries in short-distance coal seam[J]. Journal of Mining & Safety Engineering, 2024, 41(02): 242-254.

[5] Chen Shangyuan, Song Changsheng, Guo Zhibiao, et al. Asymmetric deformation mechanical mechanism and control countermeasure for deep roadway affected by mining[J]. Journal of China Coal Society, 2016, 41(1): 246-254.

[6] Xu Youlin, Xu Mengtang, Cheng Lixing. Control mechanism and experimental study on renewable bearing arch in soft and mudding roadway under dynamical pressure impact[J]. Journal of Mining & Safety Engineering, 2018, 35(06): 1135-1141.

[7] Wu Shaokang, Zhang Junwen, Xu Youlin, et al. Study on the stress evolution law of surrounding rock and cooperative control technology in coal seam group mining[J]. Coal Science and Technology, 2024, 52(3): 24−37.

[8] Zhu Lei, Zhang Sheng, He Fei, et al. Study on deformation characteristics and support technology of Study on deformation characteristics and support technology of cross layer roadway under the influence of goaf[J]. Safety in Coal Mines, 2022, 53(12): 174-182.

[9] Yuan Yue, Wang Weijun, Yuan Chao, et al. Large deformation failure mechanism of surrounding rock for gateroad under dynamic pressure in deep coal mine[J]. Journal of China Coal Society, 2016, 41(12): 2940-2950.

[10] Lu Xiaodong, Rong Peng, Zuo Yujun, et al. Study on the Stress Evolution Law of Floor Roadway and Stability of Surrounding Rocks Under Mining Disturbance[J]. Mining Research and Development, 2022, 42(11): 102-106.

[11] Ren Xiaoyang, Guo Junqing, Zhang Baisheng, et al. Mine Pressure Manifestation Law of Dynamic Pressure Roadway with Multi-GLayer Hard Roof and Roof Cutting Control Technology of Deepand Shallow Hole Combination Blasting[J]. Mining Research and Development, 2024, 44(09): 48-55.

[12] Yang Bo, Chai Jing. Floor Heave Mechanism and Control Technology of Roadway Under Dynamic Pressure Superposition Effect[J]. Mining Research and Development, 2022, 42(11): 96-101.

[13] Yuan Chao, Zhang Jianguo, Wang Weijun, et al. Controlling principles of surrounding rock in soft and broken roadway based on the distribution pattern of plastic zone[J]. Journal of Mining & Safety Engineering, 2020, 37(03): 451-460. 

[14] Wang Weijun, Fan Lei, Ma Yujie, et al. Research on surrounding rock control technology of deep roadway based on butterfly failure theory [J]. Coal Science and Technology, 2023, 51(1): 157-167.