Coal Engineering ›› 2022, Vol. 54 ›› Issue (10): 1-7.doi: 10.11799/ce202210001

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Research on Goaf Water Cavern Filling Design of Narrow Coal Pillar of Roadway in Gob Entry Driving and Surrounding Rock Control Technology

  

  • Received:2022-02-23 Revised:2022-07-26 Online:2022-10-14 Published:2023-01-06

Abstract: In order to improve the efficiency of coal mining, considering chamber filling design of narrow coal pillar of roadway in gob entry driving, take the geological conditions of Jingfang Mine Area as the background, the reasonable width of narrow coal pillar and stress distributed characteristic of water cavern roof under goaf were analyzed by numerical simulation of FLAC3D. The technology of goaf filling was proposed. Surrounding rock support control scheme on narrow coal pillar was formulated. The in-situ monitoring was made on the working load of bolt and crack development characteristics of surrounding rock in gob entry driving. The research results show that: the 6m narrow coal pillar surrounding rock has less crack development, good integrity of surrounding rock, which can meet the needs of safety production, but the surrounding rock crack development in the water cavern area of goaf needs support measures. The feasibility of excavating and filling technology was verified. The deformation of roadway surrounding rock and the working load of bolt were controlled with the use of filling technology. The research solves the technical problem of controlling the surrounding rock passing through the chamber of goaf with narrow coal pillars, which produce greatly economic benefits and provide reference experience for similar projects.

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