涡北矿四含及风化带临界水力坡度计算

Calculation of Critical Hydraulic Slope of Four Containing and Weathered Zone in Guobei Mine

摘要: 研究以涡北矿为例，采用钻孔岩体样品实验室测试等方法，通过对涡北矿研究区三隔水文地质特征及隔水性、四含水文地质特征及富水性、基岩风化带水文地质特征进行分析，进而判定四含及风化带渗透破坏类型，采用计算公式法和力学分析法等五种方法计算临界水力坡度，得出结论：矿井四含富水性、渗透性差；风化带岩石的隔水性和再生隔水能力良好；四含溃砂相对危险临界水力坡度J_cr= 1.42，风化带溃砂相对危险临界水力坡度J_cr= 1.62。

Abstract: Taking the Guobei Mine as an example, the study uses methods such as laboratory testing of drilled rock samples. Through the analysis of the hydrogeological characteristics of the third aquifuge and the water-resisting property, the hydrogeological characteristics of the four containing and the water-rich property, and the hydrogeological characteristics of the bedrock weathering zone in the study area, the seepage failure types of the four aquifers and the weathering zone are determined, and the critical hydraulic gradient is calculated by using the calculation formula method and the mechanical analysis method. It is concluded that the four containing has poor water-richness and permeability; the rock in weathering zone has good water-resisting and regeneration water-resisting ability; the relative dangerous critical hydraulic gradient of sand burst in four containing is J_cr= 1.42, and the relative dangerous critical hydraulic gradient of sand burst in weathering zone is J_cr= 1.62.