Treatment technology of water hazard of groundwater backward overflow in shaft

In order to solve the problem that the groundwater level rises through the main shaft and the auxiliary shaft in rainy season in Shandong Xinhe coal mine, which affects the safety of the main and auxiliary shafts. To control the groundwater and ensure the safe and stable operation of the mine, on the premise of not affecting the normal lifting of wellbore, the methods of conduit drainage, construction of brick-concrete formwork wall for seepage control, sand filling and grouting were adopted. Practice has proved that this method cuts off the shallow pore water backflow channel underground, and effectively solves the problem of overflow backward at the underground level. The method has obvious effects on water hazard control, short construction period, low cost and good benefit. It has certain reference and popularization application value for water hazard control engineering in the construction of similar shafts.