New hollow grouting anchor and application to dynamic pressure roadway

In order to solve a rise affected by serious dynamic influences and poor frame shield support effect problems in No.1182 mining block of Luling Mine,based on the site investigation,bolt axial force monitoring and measuring and other means,the anchor and bolt support status were analyzed. The results showed that the bolt anc horing force in the dynamic roadway would be easily attenuated and lost and the 52. 6% axial force would be within 40 k N. Nearly 70% anchors would have the sliding phe nomenon of the anchor device. Thus the bolt and anchor would have a poor structure compensation effect to the U type steel support and the frame shield support would b e hard to control the serious deformation of the dynamic roadway. Therefore a method with the high pressure grouting of a new hollow grouting anchor applied to reinforce t he broken rock mass was provided and with the double layer steel mesh and shotcreting support,the high pressure grouting could control the serious deformation of the roa dway. After the 30 days of the roadway heading,the monitoring and measurement showed that the roof was in stable basically. The roof subsidence value was 26 mm,the d eformation value of the two sidewalls was 72 mm,the floor heave was less than 100 mm and the site application requirements could be met.