Application of Grouting Technology Combined with Water Exploitation in Vertical Shaft Through Gob

The return air shaft project of three levels needed to cross the gob of Ding_5-6 in Fourth Mine of Pingdingshan Coal Co., Ltd, which contained crushed rock and a lot of water, the normal construction was unable to achieve. In order to solve these problems, with high pressure grouting technology, anti-floating technology by concrete mat and crushed rock supporting technology, the construction schedule was accelerated, the shaft wall construction quality was ensured, and shaft construction crossed the gob safely, thus the construction period was shortened greatly, finally achieved significant economic benefits.