Research on high efficient mechanical support method for weak layered clastic rock mass

The engineering geological conditions are complicated in Jinfeng gold mine, the weak layered clastic rock mass is easy to weather and apt to collapse, weather and slime with water,drift support is a key problem for this mine. According to this problem, the first wet shotcrete technology using Spraymec Chasbeen developed in China golden mine, resin bolt and installation process suiting for mechanized installation by jumbo is researched. The practices show that wet shotcrete and resin bolt have achieved effective support for drives of poor ground; direct cost of wet shotcrete and that of dry shotcrete are nearly the same, however the average strength of wet shotcrete is 45%-85% higher than that of dry shotcrete of the same materials; mesh+split sets can be replaced by wet shotcrete+resin bolt with the support time for every cut is reduced frome 106 min/m to 55 min/m, and overall support cost reduced by 30%.