Study on Filling Support Design and Ground Pressure Monitoring Scheme for Gob-Side Entry Retention by Roof Cutting and Pressure Relief in High-Gas Thin Coal Seam

Hui Li, Haodong Zu, Kanglin Zhang and Jifa Qian
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Hui Li: School of Urban Construction and Safety Engineering, Shanghai Institute of Technology, Shanghai 201418, China
Haodong Zu: School of Urban Construction and Safety Engineering, Shanghai Institute of Technology, Shanghai 201418, China
Kanglin Zhang: School of Urban Construction and Safety Engineering, Shanghai Institute of Technology, Shanghai 201418, China
Jifa Qian: School of Urban Construction and Safety Engineering, Shanghai Institute of Technology, Shanghai 201418, China

IJERPH, 2022, vol. 19, issue 7, 1-21

Abstract: To ensure the successful application of roof cutting and pressure relief in the gob, to retain the roadway in a high-gas thin coal seam, by taking the 2109 working face of the Mingxin coal mine as the engineering background, this paper comprehensively analyzes and studies the key parameters of high-water material filling and support and the law of ground pressure behavior. The results show that the high-water material filling body has the characteristics of high strength, rapid resistance increase, strong flexibility and high strength in the later stage, which can meet the requirements for retaining roadway support along the goaf. On this basis, we determined that the water-cement ratio for a high-water material filling body is 1.5:1 and the filling length, height and width each time are 3.6 m, 2.2 m and 1.0 m, respectively. In addition, a ground-pressure monitoring scheme for retaining the roadway along the goaf is put forward and the results show that the displacement of the roof and floor and the deformation of the filling body are both within a reasonable range, which proves high-water material filling support can effectively ensure the stability and integrity of the roof of the gob, thus retaining the roadway in a high-gas thin coal seam.

Keywords: thin coal seam with high gas; gob-side entry retention; high-water material; backfill and support; strata behavior regularity (search for similar items in EconPapers)
JEL-codes: I I1 I3 Q Q5 (search for similar items in EconPapers)
Date: 2022
References: View references in EconPapers View complete reference list from CitEc
Citations: View citations in EconPapers (3)

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