Study on protective burnt rock aquifer in water preserved coal mining area of western China

with the investigation on the burnt rock and burnt rock aquifer in 'ushenfu Mlining Area,the paper stated the burnt rock ditribution and the water storagestructure of the aquifr as well as the r fling runof nd drainage condtions.The underground water of bunt rock wouldreceive the atmospheric preciptation and thecross fiow refiling of the underground water from Salawasu Formation and would drain with the descending springs. The aquiter feaures of the bunt ck would be asmall distribufion area and the thin thickness ofthe aquifer,but the water abundance was strong.The maximun untf wate infow of a hole pumping test as 8.67L/(sm) and the permeablity co.ficient could be 1 631.30 m / d in maxinum. Before the coal developed.in Yvushenf uMining Ae.there were 4 5 bunmtrck sprin:s.Ameng hem,there were 325 spings with a water fowlss than 1 Li s for each spring and the total water fow was 59.458 L/ s.There were b4 sorings with a water fiow of 1 ~ 1OL/ s and the total water fiow was 142.115L/ . There were 16 spings with a water fovw igher than 10 L / s.the total water fiow was 564.610L/ s,those springs mosty located along the vall ys and banks and some burnt rock spring affected by the coal mining were to be dry in water fow ordry: The waer qualityof the undergroundwater in the burnt rock aquifer mostly was HCO3—Ca Mg or HCO3—Ca wate,the mineralization degree was 0.2s giL in maximun.The water quality was exceent and would be the valuable ecologic water resources in Yushenfu Mine Area.