摘要
煤矿露天开采会对邻近的烧变岩含水层产生强烈的扰动;以陕北某露天矿区为研究区,利用数值模型,模拟了不预留保水煤柱以及预留20、50、100 m煤柱条件下,研究区地下水流场和涌水量变化情况,评估了保水开采效果;进一步分析了开采过程中发生突涌水时,注浆帷幕的阻水效果。结果表明:煤矿开采对地下水的扰动随保水煤柱宽度增加而减小,预留100 m煤柱能使烧变岩涌水量减少86%,最大降深减少13 m左右,影响范围减小60%左右;注浆帷幕可以有效封堵集中涌水点,封堵后涌水量减小了90%左右,观测孔水位恢复了4 m左右,流场形态逐步恢复。
Open-pit mining can cause strong disturbance to the adjacent burned rock aquifer.This paper takes an open pit mine in northern Shaanxi Province as the study area,and through numerical simulation,the changes of groundwater flow field and mine discharge in the study area without reserving water-preserving coal pillars and under the conditions of reserving 20 m,50 m and 100 m coal pillars are simulated,and the effect of water-preserving mining is evaluated.Further,the water resistance performance of the grouting curtain when the burst water occurs during mining was analyzed.The results show that:the disturbance of coal mining to groundwater decreases with the increase of the width of water-preserving coal pillar,reserved 100 m coal pillar can reduce the burn rock water yield by more than 86%,the maximum depth reduction by about 13 m,and the impact area by about 60%;grouting curtain can effectively seal the centralized burst water point;the water yield reduced by about 90%,the observation hole water level restored about 4 m,the flow field restored gradually after sealed burst water point.
作者
曹虎生
徐向东
柯贤敏
陈凯
贺军
CAO Husheng;XU Xiangdong;KE Xianmin;CHEN Kai;HE Jun(Shaanxi 185 Coalfield Geology Co.,Ltd.,Yulin 719000,China;School of Water and Environment,Chang’an University,Xi’an 710054,China;Key Laboratory of Subsurface Hydrology and Ecological Effects in Arid Region of Ministry of Education,Chang’an University,Xi’an 710054,China;Yulin Chemical Co.,Ltd.,Shaanxi Coal and Chemical Industry Group Co.,Ltd.,Yulin 719000,China)
出处
《煤矿安全》
CAS
北大核心
2023年第4期175-183,共9页
Safety in Coal Mines
基金
中央高校基本科研业务费专项资金资助项目(300102290401)。
关键词
保水采煤
帷幕注浆
地下水
烧变岩
数值模拟
water-preserved coal mining
curtain grouting
groundwater
burned rock
numerical simulation
