System and application of regional fracking of coal seam roof on and under the ground to prevent rockburst

• Published in: Méitàn kēxué jìshù Vol. 51; no. 2; pp. 106 - 115
• Main Authors: PAN Junfeng, LU Chuang, MA Xiaohui, XIA Yongxue, XIE Fei, XU Gang, DOU Guidong, LYU Dazhao, SUN Xiaodong, MA Wentao
• Format: Journal Article
• Language: Chinese
• Published: Editorial Department of Coal Science and Technology 01.03.2023
• Subjects: pressure relief system; regional fracking; regional pressure relief; rock burst prevention and control; roof; well on and under fracturing
• ISSN: 0253-2336
• DOI: 10.13199/j.cnki.cst.2022-0903

To solve the problems of small local relief range, low continuity and high operational risk of rockburst, regional hydro-fracking and burst prevention system and engineering application research were carried out within thick and hard roof of a coal seam by well over thousand meters on and under the ground. The results show that, according to the loading conditions, the roof dominated rockburst can be divided into three types: superposed dynamic and static loading type, high static loading type and high static unloading type; The thick and hard roof is the main source of regional static and dynamic loading for rock burst initiation of mining surrounding rock. With the thick and hard roof as the target, which provides the source of dynamic and static load for rock burst initiation, a segmented fracturing pressure relief system for the roof with 1000 meter horizontal holes on and under the ground was established and fracking was carried out in this area. By destroying the integrity of the overlying roof in the b