摘要
评估导水裂隙带的发育高度是保障矿井安全生产的重要前提之一。以某矿11607工作面为工程背景,采用关键层判别、经验公式估计、有限差分数值模拟和现场注水实测手段,开展中硬-坚硬互层覆岩导水裂隙带发育高度研究。研究结果表明:关键层理论计算得出导水裂隙带的发育高度为55.77 m;现有三下开采指南及三下开采规范提出的经验公式仅针对某一类岩性,难以准确估计中硬-坚硬互层覆岩导水裂隙带发育高度;数值模拟得出导水裂隙带为马鞍型,高度为52 m;现场两个钻孔实测导水裂隙带发育高度分别为54.4 m和51.0 m。数值模拟和现场实测结果相近且落在经验公式计算范围内,为确保安全,取现场实测最大值54.4 m作为最终结果。本文研究成果可为相似地质条件下覆岩导水裂隙带发育高度的确定提供参考。
Evaluating the development height of water-conducting fractured zones is crucial for ensuring safe mining.Using the 11607 working face as an engineering background,this study investigates the development height of the water-conducting fractured zones in medium-hard to hard interbedded overlying strata through approaches,including key stratum identification,empirical formula estimation,finite difference numerical simulation,and field water injection measurements.Results show that the theoretical calculation of key stratum indicates that the development height of the water-conducting fracture zone is 55.77 m.The empirical formulas proposed in the current“three-under”mining guidelines and regulations,which focus on a certain type of lithology,prove inadequate for accurately estimating the development height of the water-conducting fracture zone in medium-hard to hard interbedded strata.The numerical simulation reveals a saddle-shaped water-conducting fracture zone with a height of 52 m.The measured development heights of the water-conducting fracture zone from two boreholes are 54.4 m and 51.0 m,respectively.The numerical simulation results closely align with the field measurements and fall within the range calculated by the empirical formulas.To ensure safety,the maximum value of 54.4 m is taken as the final result.This research provides a valuable reference for determining the development height of the water-conducting fracture zone under similar geological conditions.
作者
段凯
苏建军
DUAN Kai;SU Jianjun(Xiaojiawa Mine,Jingxing Energy Co.,Ltd.,Lyuliang 033000,China)
出处
《山西煤炭》
2024年第4期128-134,共7页
Shanxi Coal
关键词
中硬-坚硬互层覆岩
导水裂隙带
经验公式
数值模拟
现场实测
overlying strata
water-conducting fracture zone
empirical formula
numerical simulation
field measurement
