Study on detecting deep karst developing features by chemical tracing

Common received tracer concentration curve types are put forth and the corresponding relation between the received tracer distributing form and the karst features is studied in the paper according to karst developing features and the chemical tracer removing and diffusing regulation in karst aquifer. On this basis, in order to test the validity and practicability of chemical tracing in detecting karst developing features, the developing and the distributing features of the hidden katst in Ordovician limestone aquifer under the coal seam of Qiuji Mine, Shandong are analyzed, by putting the chemical tracer in surface drilling and receiving them from dewatering orifice under the mine. The results show, the strong developed Ordovician deep karst which spreads out along the direction of east and southeast from the northwest Qiuji Mine shows herringbone distribution patterns. The week developed and evenly distributed fissure karst takes dominant place in other area of the Qiuji Mine. It is found that karst developing distribution in the mine is conform to the water inrush from drilling hole in Ordovician limestone by compare hydrological data already made, which test the applicability and effectiveness of this technology.