人工再生顶板大跨度切眼联合支护技术

在人工再生顶板大跨度切眼支护中,由于巷道地质条件复杂,矿压显现严重,且随着地压和巷道断面的增大,存在一般锚网索支护难以克服的困难。根据人工再生顶板巷道的地质特点及矿压显现特征,在大断面人工再生顶板条件下采用"木架棚+锚索"联合支护。此种支护结合主动支护和被动支护的优点,减少顶板离层冒落,实现了对大断面切眼的有效控制,防止了切眼强烈变形、断裂,保持了切眼的稳定性,达到了良好的支护效果,为人工再生顶板下的煤炭开采提供了可靠的安全保证。在充填开采下,采用钢梁和单体液压支柱不便于回收,而木材价格低廉,减少了支护材料的丢失浪费,取得了显著的经济效益。"木架棚+锚索"联合支护技术对于充填开采大跨度巷道具有借鉴作用。

Application of Combined Support Technology in Large Span Open-off Cut under Artificial Regenerated Roof

In large span open-off cut under artificial regenerated roof，due to roadway complicated geological conditions，mine pressure appear serious.With the pressure and the section of roadway increasing，there is a difficulty that common anchor net and rope can′t overcome.According to the geological characteristics and ground pressure characteristics of roadway，a combined support of wooden shed and anchor is used in large section of artificial regenerated roof.Such support combined the passive and active support′s merits.It reduced the roof separation and falling， achieved the effective control to the large span open-off，prevented the cut deformation and rupture and maintained the stability of the cut.Also，it provided a reliable guarantee for the mining of coal under artificial regenerated roof.It is not easy to cyclically reuse steel beams and single hydraulic in backfill mining.But due to cheap prices，the use of wooden materials reduced supporting material loss and waste，which achieved remarkable economic benefits.The joint support of wooden shed and anchor can be used in backfill mining of large span tunnel for reference.