WEI S J, HUANG Y J, TAN Y,et al.Instability mechanism and control technology of repeated mining roadway in multiple coal seams[J].Journal of Henan Polytechnic University(Natural Science) ,2024,43(5):1-9.

doi:10.16186/j.cnki.1673-9787.2023050012

Received:2023/05/07

Revised:2023/09/22

Published:2024/07/31

Instability mechanism and control technology of repeated mining roadway in multiple coal seams

WEI Sijiang1,2, HUANG Yingjun1, TAN Yi1,2, WANG Meng1,2, QIN Jianyun3, YANG Fajun3

1.School of Energy Science and Engineering，Henan Polytechnic University，Jiaozuo 454000，Henan，China;2.Collaborative Innovation Center of Coal Work Safety and Clean High Efficiency Utilization，Jiaozuo 454000，Henan，China;3.Kuqa Yushuling Coal Mine Co.，Ltd.，Kuqa 842000，Xinjiang，China

Abstract:The working face of W9-10-22290 is an isolated working face in the second mining area of the third level of Pingmei No.6 coal mine. The outer section of the air roadway will be affected by the mining of the overlying W8 and the underlying No.5 coal mine during the mining service，and the mining space-time relationship is extremely complex. Objectives To explore the instability mechanism and control technology of repeated mining roadways in multiple coal seams， Methods based on the spatio-temporal evolution relationship of stress in the mining face，a surrounding rock control method for the entire lifecycle of the outer section of the air roadway in the W9-10-22290 working face the Pingmei No.6 coal mine was proposed and applied in field engineering. Results The results showed that the roof of the roadway presented tensile shear failure after the close coal seam mining.During the mining process of the coal seam and the underlying coal seam，the roadway would be subjected to advance abutment pressure step by step.According to the spatio-temporel disturabnce and high-stress environment of the surrounding rock of the roadway，a comprehensive surrounding rock control technology of combining resistance，yielding，and pressure relief was proposed，which included“high pre-stressed high-strength bolts+anchor cables+deep hole blasting for pressure relief”.Field industrial tests showed that the maximum deformation of the two sides during tunnel service was 347 mm，and the top settlement and floor heave were within the controllable range，which could meet the requirements of mine safety production and achieve better technical and economic benefits. Conclusions The research results provided a reference for the surrounding rock control of mining tunnels under similar conditions.

Key words:multiple coal seams;repeated mining;mining roadway;instability mechanism;surrounding rock control