基于正向—反向高压注水试验的深部矿井断层阻水性特征研究  

Study on Fault Water Resistance Characteristics of Deep Mine Based on Forward-reverse High Pressure Water Injection Test

作　　者：於昌峰 姜春露[2] 吴云[2] YU Changfeng;JIANG Chunlu;WU Yun(Jiangsu Coal Geological Prospecting Team Three,Changzhou 213017,China;School of Resources and Earth Sciences,China University of Mining and Technology,Xuzhou 221116,China)

机构地区：[1]江苏煤炭地质勘探三队,江苏常州213017 [2]中国矿业大学资源与地球科学学院,江苏徐州221116

出　　处：《金属矿山》2025年第2期131-137,共7页Metal Mine

基　　金：国家自然科学基金面上项目(编号:52274243)。

摘　　要：针对深部矿井开采多次扰动下断层阻水性变化问题,选择永城矿区某矿巷道揭露断层,采用双孔注水法,开展了正向多次重复和反向高压注水试验。获取了注水水压、流量和监测孔水压动态曲线,计算了断层阻水强度和渗透系数参数。结果表明,多次高压注水试验中,测试断层都表现出阻水性强、渗透性差的特点,渗透系数均在1×10^(-6) cm/s量级,属微透水。反映出正向重复注水和反向注水过程中断层测试段没有发生明显的结构性渗透破坏,仅形成微裂隙渗流通道。随着高压注水次数的增加,断层表现出阻水强度降低、渗透性增强的趋势。反向注水时断层渗透系数最大值是正向初次注水时的3.14倍、第4次重复注水时的1.41倍,表明此时微裂隙有一定扩展连通,断层阻水性能下降较大。对比已有断层活化突水条件,本研究中巷道掘进扰动程度较低,断层原生胶结结构破坏较轻,仍具有很高的阻水性能,在试验较高水压作用下也没有发生透水。研究结果对该矿区底板断层突水危险性评价具有重要参考价值,也可为类似条件矿区断层阻水性评估提供参考。Aiming at the problem of fault water resistance change under multiple disturbances in deep mine mining,a mine roadway in Yongcheng mining area was selected to expose the fault,and the double-hole water injection method was used to carry out forward repeated and reverse high-pressure water injection tests.The dynamic curves of water injection pressure,flow rate and water pressure of monitoring hole are obtained,and the parameters of water resistance strength and permeability coefficient of fault are calculated.The results show that in many high-pressure water injection tests,the test faults show the characteristics of strong water resistance and poor permeability.The permeability coefficient is in the order of 1×10^(-6) cm/s,which is slightly permeable.It reflects that there is no obvious structural seepage failure in the fault test section during the forward repeated water injection and reverse water injection,and only the micro-fracture seepage channel is formed.With the increase of the number of high-pressure water injection,the fault shows a trend of decreasing water blocking strength and increasing permeability.The maximum value of fault permeability coefficient during reverse water injection is 3.14 times that of the first positive water injection and 1.41 times that of the fourth repeated water injection.It shows that the micro-cracks have a certain expansion and connection,and the water resistance performance of the fault decreases greatly.Compared with the existing fault activation water inrush conditions,the disturbance degree of roadway excavation in this study is low,the damage of the primary cementation structure of the fault is light,it still has high water resistance performance,and there is no water permeability under the action of high water pressure in the experiment.The research results have important reference value for the risk assessment of water inrush from floor faults in the mining area,and can also provide reference for the assessment of fault water resistance in mining areas with simila

关 键 词：断层阻水性 高压注水试验 深部矿井 渗透系数 阻水强度 

分 类 号：TD741[矿业工程—矿井通风与安全]