Water enrichment characteristics of burnt rock and prediction on water loss caused by coal mining

The burnt rock aquifer is an important ecological water resources in Yushenfu mining area. In order to study the water loss and protection of burnt rock,this paper analyzed classification,distribution,hydraulic connection and water enrichment feature of burnt rock. Numerical simulation method was used to predict water loss which caused by mining and then concluding three approaches of “offsite storage” burnt rock water. The research shows that burnt rock can be divided into 3 categories and 5 small classes,among them sinter rock and similar lava rock are main water stor- age carriers. The distribution of burnt rock is controlled by topography,while the scale is affected by coal seam thick- ness,exposed height and spontaneous combustion conditions. Besides,water abundance of burnt rock is determined by supply condition,excretion condition and water storage condition. The result also shows the burnt rock aquifer is sub- jected to the recharge of the overlying aquifer and excreting by spring and mine drainage. Additionally,draining water quantity and borehole design was summarized by numerical simulation. On the basis of experience of water-preserved mining,three methods could be summarized to protect and utilize water resource of burnt rock,which are reservoir wa- ter storage,goaf water storage and surface water irrigation.