关键词: 地面顺层孔, 帷幕注浆, 巨厚含水层, 岩溶, 灰岩角砾岩

Abstract: Grouting curtain closure is one of the main technical methods for water prevention and control in groundwater abundant mines. The “fifth aquifer” of Zhuxianzhuang coal mine in Huaibei mining area have the characteristics of large static reserves, good runoff conditions, high water pressure and strong dynamic replenishment, which seriously threaten the mining of the No.8 coal seam. A water control plan of "curtain closure and draining mining" was proposed. Aimed at the karst fissure aquifer with large buried depth, huge thick layer, and extremely strong water-rich, the ground bedding borehole grouting technology was applied to the curtain closure project for the first time. Developed drilling double-row parallel dislocation hole layout, internal and external cross inspection method. The grouting control technology of pressure control and multi-time control grouting, and a three-stage quality inspection system have proposed. Finally, the curtain construction technology of deeply buried huge thick and water-rich aquifer based on ground bedding borehole was formed. An engineering demonstration was carried out in Zhuxianzhuang Coal Mine. The curtain seepage was less than 40m3/h, the interception rate was greater than 98%, and the water level difference between inside and outside was 350m. The curtain closure effect is good, and the coal resources under the Liberation Five Containment are more than 15 million tons.