Study on retention of sand proof coal pillars for mining under loose and weak aquifers
CHEN Jianwei
Abstract：Coal mining under loose and weak aquifers is prone to water-burst and sand-burst accidents.The hydrogeological structure of the overlying strata must be found out,by using various technical methods such as electric exploration,hydrogeological exploration,drilling and pumping test,etc.The type of waterproof coal pillar and mining level requirements were determined.By using empirical formulas,similar mining area engineering analogy methods,and analysis of measured data,the parameter values of the"two zones"of collapse zone and fracture zone during the mining period of the working face were determined,providing a basis for the reasonable setting of sand control coal pillars.The engineering practice of the No.15021 working face in Wangxingzhuang Coal Mine showed that the research results on the re-tention of sand control and waterproof coal pillars were reasonable and reliable,and can achieve safe mining of the working face.
Keywords：loose and weak aquifershydrogeological structurecaving zonefracture zonesand proof coal pillar
Publication Date：2024-10-28
Online Publishing Date：2025-08-15(First online date of this platform, not the publication date of the document)
Pages：5( 39-43 )