煤层为主含水层矿井水害防治技术研究

煤层为主含水层是一种特殊的地质条件,极易造成突水等水害事故。本文以小纪汗煤矿为例,在分析矿井水文地质条件和煤层富水特征的基础上,研究了煤层为主含水层的地质成因,并建立了矿井水害防治体系。研究表明:顶板砂岩遇水松散且裂隙易于封闭、煤体渗透率高、煤层裂隙发育以及丰富的裂隙水补给是煤层为主含水层的主要地质成因;建立了煤层揭露时"地面疏水,井下排水,注浆封堵"结合、巷道掘进时"拉顶泄压,水仓集水,集中排放"和工作面回采时"提前排水,矿压控制"的综合水害防治技术体系。研究成果在小纪汗煤矿11203工作面进行了工程应用,应用效果良好。

Research on Prevention and Control Technology of Water Disaster in Main Aquifer Coal Seam

The coal seam being the main aquifer is a special geological condition, causing many water disasters such as inrush. Taking Xiao Jihan coal mine as an example, the geologic origins are researched and prevention system for water disasters in mines is established, based on analyzing hydrogeological conditions and water bearing characteristics of coal seam. The studies indicate that: the geologic origins that make coal seam main aquifer are contributed by the roof and cracks which intend to be loose when encountering water respectively, high permeability of coal, development of coal fracture and abundant supply of water. According to the origins, comprehensive technology system of preventing water disaster is proposed, including drainage from the ground and underground, grouting and plugging during exposing the coal, pulling the top to release pressure and catchment and discharging in the sump during tunneling, drainage in advance and pressure controlling during mining. The studies have been applied in 11203 workface in Xiao Jihan coal mine and turned out to be well.