注浆充填开采对地下水水质的影响研究

Influence of Grouting Filling Mining on Ground Water Quality

为了研究离层注浆充填开采对地下水水质的影响,分析了淮北矿区海孜矿Ⅱ102采区的充填开采现状,通过理论分析、数值模拟和现场实测等手段,在研究采动裂隙和离层带空间关系的基础上,进行浆液运移通道探测示踪试验,开展浆液运移规律模拟研究,并在注浆站附近区域和井下采集水样,进行水质检测。结果表明:垮落带高度为12.0~12.8m,导水裂缝带高度为46~52.24m;注浆有效支撑区域面积占整个采空区面积的70%,注浆体形成了有效支撑作用;示踪离子在巷道中出现,说明浆液与巷道具有一定的水力联系;随着时间的推移浆液发生迁移,迁移影响范围在注浆孔的1km之内;注浆浆液对第四系松散层饮用水无影响,但对煤层顶板局部的煤系地层砂岩裂隙水水质造成部分影响,随着矿井水的稀释,该部分影响可忽略不计。

In order to study the influence of grouting and filling on groundwater quality,the grouting and filling status in No.102 mining area of a mine in Huaibei Mining(Group)Co.,Ltd.is used.Based on the study of the spatial relationship between mining fissures and separation zones,the grouting and filling tracing tests are carried out to simulate the grouting and fluid migration laws.The water samples are collected near the grouting station and underground for water quality detection.The results show that the height of caving zone is 12.0~12.8m,the height of water conducting fracture zone is 46~52.24m,the effective support area of grouting accounts for 70%of the total mined out area,and the grouting body forms an effective support function;the presence of tracer particles in the lane-way indicates that the grouting fluid has a certain hydraulic relationship with the roadway;the grouting fluid migration occurs as time goes on,and the influence range of migration is within 1km of the grouting hole.And grouting slurry has no effect on drinking water in Quaternary loose strata,but has a partial effect on the quality of sandstone fissure water in coal strata at the local roof of coal seam,which can be neglected with the dilution of mine water.