US 12,276,196 B2
Three-level prevention and control method for rock burst roadway
Yongzheng Wu, Beijing (CN); Yukai Fu, Beijing (CN); Xiaowei Chu, Beijing (CN); Jinyu Chen, Beijing (CN); Jie He, Beijing (CN); Xinhua Liu, Beijing (CN); and Xianzhi Meng, Beijing (CN)
Assigned to CCTEG COAL MINING RESEARCH INSTITUTE, Beijing (CN)
Appl. No. 18/006,561
Filed by CCTEG COAL MINING RESEARCH INSTITUTE, Beijing (CN)
PCT Filed Apr. 15, 2021, PCT No. PCT/CN2021/087397
§ 371(c)(1), (2) Date Jan. 23, 2023,
PCT Pub. No. WO2022/110615, PCT Pub. Date Jun. 2, 2022.
Claims priority of application No. 202011354530.8 (CN), filed on Nov. 26, 2020.
Prior Publication US 2023/0296021 A1, Sep. 21, 2023
Int. Cl. E21D 9/00 (2006.01)
CPC E21D 9/001 (2013.01) 6 Claims
OG exemplary drawing
 
1. A three-level prevention and control method for roadway rock burst, comprising:
before digging a roadway, pre-weakening a thick and hard rock stratum above the roadway using a regional staged hydraulic fracturing technology of long borehole;
during digging the roadway, performing a pre-stress support, a pressure relief, and a reinforcement; and
before stoping at working-face, transferring a stress of an advanced abutment pressure using a local hydraulic fracturing technology of medium and short borehole, and arranging a composite energy-absorbing protective structure around the roadway.