THE TECHNOLOGY AND APPLICATION EFFECT OF WATER-PRESERVED MINING WITH NARROW STRIP

In order to evaluate the application effect of water-preserved technology with narrow strip in the coal mining area of northern Shaanxi, through the analysis of the geological structure in Yubojie coal mine and Xuemiaotan coal mine of Yu-Shen mine area. The strip mining method of mining 12 remining 8 was determined by numerical simulation and physical simulation. The monitoring system of coal pillar stress, displacement monitoring and loose ring of strip mining face were established in Yubojie coal mine. The observation hole for water table have been set up respectively in Yubojie coal mine and Xuemiaotan coal mine. To comparative analysis the development height of diversion fissure zone and the thickness of aquiclude with before and after mining, using the method of goaf submerged depth detection in Yubojie coal mine and Xuemiaotan coal mine of Yu-Shen mine area, and then systematic understanding of the variation characteristics of diving position before and after mining. The research shows that the development height of the guide water fracture zone in the coal working face is not through the aquifer. The coal pillar is relatively stable. The maximum depth of diving was 1.25m. The vegetation on the surface is good. It shows that the method of narrow strip mining effectively guarantees the stability of rock stratum and coal pillar, maintaining the reasonable depth of ecological water level, and achieving water-preserved mining.