Coal Engineering ›› 2022, Vol. 54 ›› Issue (11): 79-83.doi: 10.11799/ce202211015

Previous Articles     Next Articles

Study on Optimal Design of Roadway Support with Rich Water and Weak Cementation Roof

  

  • Received:2022-03-31 Revised:2022-05-29 Online:2022-11-15 Published:2023-03-09

Abstract: In order to solve the problem of optimal design of roadway support of water rich and weakly cemented roof in western coal mine, through the experimental study of coring rock samples of water rich and weakly cemented roof in western coal mine, it is concluded that the rock samples reach the water saturated state after immersion for 24 hours, are prone to expansion deformation and delamination in the vertical direction, and the uniaxial compressive strength is 18.9% lower than the normal. According to the test results and the actual geological conditions on site, three targeted roadway support optimization designs are proposed: section optimization, roof support anchoring force enhancement optimization technology and roadway gradient anchoring optimization technology. The field observation results show that after the optimization of roadway support, most of the shallow and deep separation layers of the roof are distributed within 0 ~ 10mm during roadway excavation, and the increased load of the bolt (cable) of the surrounding rock of the roadway is mostly distributed within the range of 11 ~ 30KN, within the bearing capacity of the bolt and cable. The ground pressure is not obvious during roadway excavation. The safe support of roadway is realized, and the optimal support practice demonstration is carried out for the roadway support of water rich and weakly cemented roof in western coal mine.

CLC Number: