摘要
井工开采使用的人工合成多孔充填材料固有的导水和渗透特性,给井下工作面带来潜在水害风险。为深入探查老虎台煤矿浅部充填体原位导水能力,采用室内测试、数值分析和基于氯化钠与大气降水的联合连通试验方法,研究天然条件下充填体的渗透性。结果表明:浅部人工充填体主要物质组成为页岩,混合有炉渣、粉煤灰及河砂,强度低、胶黏性差、易破碎,遇水后强度迅速衰减。基于氯化钠与大气降水的联合连通试验,井下监测点电导率表现出的变化特性,是充填材料组分和降水内外因素共同作用的结果。5处监测位置电导率转折点出现时间反映充填体内地下水循环交替速度差异,充填材料组成和分布特性影响其渗透性,充填体的平均渗透系数为5.8 m/h,与已有示踪试验和数值分析结果处于同一数量级。
The inherent water conductivity and permeability characteristics of artificial porous filling materials in underground mining pose potential water hazard risks to underground working faces.This study attempts to investigate the in-situ water conductivity of shallow filling materials in the Laohutai Coal Mine.We conducted laboratory testing,numerical analysis,and a combined connectivity test using sodium chloride and atmospheric precipitation to explore the permeability of the filling materials under natural conditions.Results indicate that the shallow filling materials primarily consist of shale mixed with slag,fly ash,and river sand.These materials feature low strength,poor cohesion,and high brittleness,with rapid strength degradation upon water exposure.The estimated average permeability coefficient from tracer tests aligned closely with numerical analysis results.Based on the combined sodium chloride and atmospheric precipitation connectivity tests,the conductivity curves of the underground monitoring points resulted from the combined effects of material composition and rainfall.The timing of conductivity inflection points at 5 monitoring locations reflected variations in the groundwater circulation rate within the filling body.The composition and distribution of the filling materials significantly influence their permeability,with an average permeability coefficient of 5.8 m/h.This is consistent with the results of tracer tests and numerical analysis.
作者
张健
刘守强
郭亮亮
刘钦
ZHANG Jian;LIU Shouqiang;GUO Liangliang;LIU Qin(College of Water Resources Science and Engineering,Taiyuan University of Technology,Taiyuan Shanxi 030024,China;Shanxi Key Laboratory of Collaborative Utilization of River Basin Water Resources,Taiyuan Shanxi 030024,China;National Engineering Research Center of Coal Mine Water Hazard Controlling,China University of Mining and Technology-Beijing,Beijing 100083,China)
出处
《矿业科学学报》
北大核心
2025年第4期661-669,共9页
Journal of Mining Science and Technology
基金
国家自然科学基金(52379018)
山西省基础研究计划(20210302124485,202203021211127)。
关键词
充填体
渗透性
材料组分
数值分析
连通试验
backfill
permeability
material composition
numerical analysis
tracer test
