Research on Hydraulic Connection of Aquifers Based on Roof Dewatering and Drainage in Working Face
YANG Jian
ZHAO Caifeng
Abstract：In order to make clear the hydraulic connection between Cretaceous aquifer and No. 3-1coal seam roof aquifer in a coal mine in the contiguous area of Shaanxi and Inner Mongolia, study was carried out on the atmospheric rainfall, the water level of aquifer and the hydro-chemical variation in the process of roof dewatering and drainage in the first-mining face. The results showed that the advanced roof dewatering in the first-mining made the water inflow near the starting cut drop to 3~5 m3/h and the groundwater pressure reduce to about 1. 0 MPa and finally a stable groundwater depression cone was formed. In the process of dewatering and drainage, the water level of the Cretaceous aquifer basically kept steady, while the water level of No. 3-1coal seam roof aquifer dropped obviously. There were great differences in mineralization degree and hydro-chemical types between Cretaceous aquifer and No. 3-1coal seam roof aquifer, but their hydro-chemical characteristics basically kept steady in the process of dewatering, which indicated that the low mineralized water in Cretaceous aquifer did not infiltrate into No. 3-1coal seam roof aquifer. The Anding-Zhiluo formations didn' t develop water-conducting channels connecting the upper and lower aquifers. The poor hydraulic connection between Cretaceous aquifer and No. 3-1coal seam roof aquifer provided the necessary geological guarantee for safe production of the mine.
Keywords：hydraulic connectiondewatering and drainage of aquifercoal seam roofworking facehydro-chemical characteristics
Publication Date：2015-01-01
Pages：3( 84-86 )