WANG G L, WANG F, WANG S Y,et al.Study on the development characteristics of the water-conducting fissure zone in large-height and ultra-wide working faces at Sihe Coal Mine[J].Journal of Henan Polytechnic University(Natural Science) ,2025,44(5):82-90.

DOI:10.16186/j.cnki.1673-9787.2023110011

Received: 2023/11/08

Revised: 2024/03/08

Published:2025/07/23

Study on the development characteristics of the water-conducting fissure zone in large-height and ultra-wide working faces at Sihe Coal Mine

Wang Guoliang1,2, Wang Fei3, Wang Shuyong2, Cheng Fengfei2, Du Feng4

1.College of Continuing Education， Taiyuan University of Technology， Taiyuan  030000， Shanxi， China；2.Sihe Coal Mine of Jinneng Holding Equipment Manufacturing Group Co.， Ltd.， 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: Objectives To investigate the development characteristics of the water-conducting fissure zone in large-height and ultra-wide working faces at Sihe Coal Mine， using the 6306 working face as the study subject.  Methods The variation in apparent resistivity of the roof rock strata before and after mining was measured using the parallel electrical method. Numerical simulations were also conducted to analyze the development characteristics of the water-conducting fissure zone.  Results （1） The apparent resistivity of the roof strata changed significantly due to mining. The original strata exhibited an apparent resistivity of 150~300 Ω·m， while severely damaged strata reached up to 680 Ω·m. Field measurements showed that the caving zone height was 21.0 m， with a caving ratio of 3.5. The lower limit of the water-conducting fissure zone was measured at 82.5 m， with a fissure ratio of 13.8. The upper limit was not captured during the observation period. （2） Numerical simulations indicated a caving zone height of 21.9 m. When the working face advanced to 300 m， the water-conducting fissure zone reached its maximum height of 90.6 m. The final morphology of the fissure zone exhibited a saddle-shaped distribution. （3） Since the caving zone develops rapidly， it had already fully formed during the monitoring period， resulting in good agreement between field measurements and numerical simulations. However， the water-conducting fissure zone requires at least 1~2 months to fully develop. Due to the short effective monitoring time， significant deviations existed between field measurements and simulation results. Conclusions The water-conducting fissure zone in the large-height and ultra-wide working faces at Sihe Coal Mine develops to a height of 82.5~90.6 m， with a final saddle-shaped morphology. The results provide important guidance for the prevention of roof water hazards and for the scientific extraction of gas from goafs.

Key words:water-conducting fissure zone;ultra-wide working surface;parallel electrical method;apparent resistivity;caving zone