A new ground control measure for double-use entries in underground coal mines. (December 2022)

• Record Type: Journal Article
• Authors: Kang, Hongpu; Lv, Huawen; Zhang, Xiao; Gao, Fuqiang; Tian, Jinzhou; Yi, Zhongyu
• Is Part Of: International journal of rock mechanics and mining sciences. Volume 160(2022)
• Publication Date: 2022-12
• Subjects: Double-use entry -- Ground control -- Concrete package -- Stress relieve; Rock mechanics -- Periodicals; Soil mechanics -- Periodicals; Mining engineering -- Periodicals; Roches, Mécanique des -- Périodiques; Sols, Mécanique des -- Périodiques; Technique minière -- Périodiques; 624.151305
• DOI: 10.1016/j.ijrmms.2022.105266
• Languages: English
• ISSNs: 1365-1609

Abstract

Abstract: Retreat longwall mining with a double-use entry system has many advantages over other multiple-entry systems including high coal recovery, extra entry excavation, and low risk of coal bursts. The essential of the double-use entry system is to construct a competent solid sidewall to ensure the stability, shape, and profile of the entry during retreating the first longwall face. In this study, a new comprehensive ground control measure is proposed for the construction of the sidewall and ground control of double-use entries. The system consists of strong support components to support the entry roof, in conjunction with destressing measures to diminish the influence of excessive mining-induced pressures. Laboratory tests and numerical modeling are performed to evaluate the effect of the competent support element and destressing measures, to optimize the proposed ground control system. Field-monitored data and on-site examinations showed that the proposed system successfully controlled the deformation of the double-use entry and maintained its profile during the coal mining of the first and second longwalls. The proposed system provides a new alternative for underground coal mines with restricted requirements of high coal recovery and coal burst prevention through optimizing longwall entry system.