ZANG J C，LI D H，ZHANG L，et al. Study on the development law of water-conducting fissure zone in large mining height and ultra-wide working face of Sihe coal mine［J］.Journal of Henan Polytechnic University（Natural Science），doi:10.16186/j.cnki.1673-9787.2023110011

doi: doi:10.16186/j.cnki.1673-9787.2023110011

Received：2023-11-08

Revised：2024-03-08

Online：2024-12-13

Study on the development law of water-conducting fissure
zone in large mining height and ultra-wide working face of
Sihe coal mine

WANG Guoliang^1,2, WANG Fei³, WANG Shuyong², CHENG Fengfei², DU Feng⁴

(1. School of Continuing Education Taiyuan University of Technology, Taiyuan 030000, Shanxi, China; 2. Jinneng Holding Equipment Manufacturing Group Co.，Ltd., Sihe Coal Mine， Jincheng 048000, Shanxi, China; 3.Shanxi Jinmei Group Technology Research Institute Co.，Ltd.， Jincheng 048000, Shanxi, China; 4.School of Energy Science and Engineering，Henan Polytechnic University, Jiaozuo 454000, Henan, China)

Abstract: [Objective] In order to obtain the development law of the water diversion fracture zone in the large mining height and ultra-wide working face of Sihe coal mine. [Methods] Taking the 6306 large mining height and ultra-wide working face of Sihe coal mine as the research object, the variation law of apparent resistivity of roof rock of coal seam before and after mining is observed by using parallel electric method. [Results] (1) The change in apparent resistivity of the coal seam roof rock layers before and after mining is significant. The original strata's apparent resistivity is 150~300 Ω•m, and the severely damaged strata can reach 680 Ω•m. The measured height of the caving zone in the large mining height and super-wide working face using parallel electrical method is 21.0m, with a caving ratio of 3.5. The measured lower limit of the water-conducting fracture zone's height is 82.5m, with a fracturing ratio of 13.8. The upper limit of the water-conducting fracture zone was not effectively captured during the observation period; (2) Numerical calculations show that the height of the caving zone in the large mining height and super-wide working face is 21.9m. When the working face advances to 300m, the water-conducting fracture zone develops to its highest at 90.6m, and the final form of the water-conducting fractures still conforms to the 'saddle-shaped' distribution characteristics; (3) Since the caving zone develops to its maximum height in a short time, the parallel electrical method test process, the caving zone has fully developed, and the field measurements are close to the numerical calculation results. However, it takes at least 1-2 months for the water-conducting fracture zone to develop to its maximum height. Due to the short effective testing time on site, there is a significant deviation between the field measurements and the numerical calculation results. [Conclusion] The development height of the water-conducting fracture zone in the large mining height and super-wide working face of the Sihe Coal Mine ranges from 82.5m to 90.6m, and the final form of the water-conducting fractures exhibits 'saddle-shaped' distribution characteristics. These research results have significant implications for preventing water hazards in the roof of the Sihe Coal Mine and for scientifically extracting gas from the mined-out area.

Key words: water conduction fracture zone; extra-wide working surface; parallel electrical method; numerical simulation

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