Application of Joint Support Design for Crushed Perimeter Rock in Roadway Excavation
Aiming at the Longdingshan Coal Mine 15206 back to the wind during the tunneling by the neighbouring air-mining zone,fault structure and other concentrated stress superimposed disturbing damage,resulting in the roadway in the 420-470 m section of the roof and two gangs of the serious crushing,the use of anchor rods(ropes)to support the effect of poor support,the support failure rate and other technical difficulties,through technical research,decided to take"JW"for the crushed peripheral rock.Through technical research,it is decided to adopt"JW steel shed+truss anchor"joint support for the peripheral rock in the broken area,and use the peripheral rock monitoring system with the shed to monitor the peripheral rock deformation.The application effect shows that,after the adoption of the joint support technology,the phenomenon of top plate and gang crushing is obviously controlled,the amount of the top plate sinking is controlled at less than 0.19 m,and the amount of the two gangs'shrinkage is controlled at less than 0.27 m,which has achieved remarkable application results.
roadwaystress fracture zonejoint supportperimeter rock monitoring
NETL
NSTL
万方数据
