山西离柳矿区导水陷落柱井下定向注浆治理

Directional Grouting Treatment of Water-flowing Collapse Column in Liliu Mining Area of Shanxi Province

随着煤矿开采深度的增加,矿井水害带来的危害也相应增加,导水陷落柱可联通顶底部含水层,造成矿井突水事故。以山西离柳矿区郭家山煤矿工作面X4-2陷落柱井下钻探注浆治理为例,系统总结了陷落柱井下定向注浆治理技术,采用探查、治理、验证“三位一体”方法,利用钻探、注浆手段对陷落柱柱体及周围裂隙进行全方位的注浆加固,最大程度的封堵导水裂隙,提高底板岩层的整体性。经效果检测孔、注浆前后物探对比分析,陷落柱底板有效加固厚度在35m以上,底板覆岩阻、隔水性能得到加强,治理区段最大突水系数为0.014MPa/m,注浆后加固、堵水效果明显,方法有效、可行,可保障矿井生产接续和安全生产。

As the depth of coal mining increases,the damage posed by water hazard in mines increase correspondingly.Water inrush through collapsed columns can connect the aquifers at the top and bottom of coal seams,leading to sudden water inrush accidents in mines.Taking the example of the in-mine drilling and grouting treatment of the collapsed column at the X4-2 working face of Guojiashan Coal Mine in the Liliu Mining Area of Shanxi,the directional grouting treatment technology for collapsed column underground was systematically summarized.A three-in-one approach of exploration,treatment,and verification was employed.Drilling and grouting methods were utilized to perform all-round grouting reinforcement on the pillar body and surrounding fractures of the collapsed column.Thus,the sealing of water-conducting fractures was maximized,and the overall integrity of the floor strata was enhanced.Through a comparative analysis of geophysical exploration data and physical prospecting data before and after grouting,it has been determined that the effective reinforcement thickness of the collapsed column floor exceeds 35 meters.The roof strata and waterproofing performance of the floor have been strengthened,and the maximum inrush water coefficient in the treated section was reduced to 0.014 MPa/m.The grouting and sealing effects after treatment were evident,ensuring the continuity of mine production and safety.