针对采动破坏岩体在某些水、岩化学环境下常易出现水渗流能力降低的自修复现象，以含铁质矿物的砂质泥岩破碎岩样为研究对象，就酸性水溶液浸泡与过流过程中岩样的降渗过程及其产生机理开展了实验探索与理论研究。结果表明:酸性水对含铁破碎岩样的降渗现象除了与传统认识的黏土矿物遇水膨胀作用有关外，还与水、岩离子交换化学反应形成的铁质沉淀物和次生矿物对渗流通道的封堵作用密切相关;且随着实验过程中水溶液逐步由酸性向中性转变，破碎岩样的降渗趋势也呈现一定的分区特征。在水溶液pH值较低的初期阶段，岩石矿物受溶解、溶蚀作用显著，长石等铝硅酸盐矿物与H⁺发生离子交换生成次生高岭石、绢云母、石英等矿物，引起岩样渗透率小幅下降，并促使水溶液pH值逐步升高;由此，绿泥石、伊利石等矿物中析出的Fe²⁺氧化生成Fe(OH)₃化学沉淀的进程大幅提高，引起实验中期岩样渗透率呈快速下降趋势;说明铁质沉淀物对破碎岩样的封堵降渗作用明显强于次生矿物。当水溶液的溶解、溶蚀作用因其pH值升高而快速衰减时，铁质沉淀物与次生矿物的生成进程也随之降低，水溶液对岩样的降渗作用随即进入尾声。研究结果为“人工调节地下水、岩化学环境促进破坏岩体修复”的保水对策制定形成了重要启示，可为煤炭开采水资源保护与生态修复等提供理论参考。 

Aiming at the self-healing phenomenon that the water permeability capability of mining-induced broken rock was prone to decrease in some chemical environment with water-rock interaction,the process and mechanism of perme- ability reduction that happened during soaking and water-passing process in the acidic aqueous solution,taking iron- bearing broken sandy mudstone as rock samples,was experimentally investigated and theoretically studied. The results showed that the permeability reduction of rock samples was significantly influenced by the blocking function of iron bearing sediment and secondary mineral which formed during ion-replacement reaction,in addition to the traditional view of claystone expansion when interacted with water. Furthermore,the permeability of broken rock samples showed different levels during the process that solution transformed from acid to neutral. During the initial phase with low pH value,rock samples were significantly dissolved and corroded. Aluminosilicate minerals,such as feldspars,exchanged ion with H+ ,generating secondary mineral,such as kaolinite,sericite,quartz and so on,which caused slight permeabili- ty reduction and the particular increase of pH value. Based on the findings above,the process was greatly improved that Fe2+ ,separated from illite and chlorite,was oxidized into Fe(OH)3 ,which entailed a rapidly reducing trend in the mid-stage trial. Therefore,the iron-bearing sediment had a stronger effect on the permeability reduction of rock sam- ples. However,when the dissolution and corrosion of solution rapidly declined,the generation of iron-bearing sediment and secondary mineral,and the function of solution on permeability reduction would decreased simultaneously,even ended. The results provided an important inspiration for underground broken rock repairment by artificially controlling chemical environment with water-rock interaction,and gave a theoretical reference to water resource conservation and ecological restoration in coal mining.