矿井积水与破碎煤岩体水-岩相互作用研究

Research on Water-Rock Interaction Between Mine Water Accumulation and Broken Coal and Rock Mass

矿井积水与采空区破碎煤岩体的长期相互作用将会导致水质发生变化,并有可能成为污染地下含水层的直接因素。为探究二者相互作用过程中的水质变化规律,试验分析了不同温度,不同风化程度条件下的离子变化规律与内在机理。结果表明:随着温度以及煤岩体风化程度的增加,Na+与K+的释放总量与速度均会表现为正相关的演化规律;Ca^(2+)浓度变化受到溶蚀与沉淀的综合作用结果,表现为先上升后下降的趋势;水体总碱度变化过程可分为初期溶蚀阶段,中期吸附阶段,后期稳定阶段;水体总硬度变化过程可分为初期溶蚀阶段,中期吸附阶段,后期溶蚀阶段;破碎煤岩体净化水体的过程中存在溶蚀、沉淀与吸附的竞争过程,并且具有明显的时效性,对水质具有重要影响。

The long-term interaction between mine water accumulation and broken coal and rock masses in goaf will lead to changes in water quality and may become a direct factor in polluting underground aquifers.To explore the water quality changes law during the interaction process between the two,experiments are conducted to analyze the ion changes law and internal mechanisms under different temperature and different weathering degree conditions.The results show that with the increase of temperature and the weathering degree of coal and rock mass,the total release amount and rate of Na+and K+will exhibit a positively correlated evolutionary law;The changes in Ca^(2+)concentration is the result of the comprehensive effect of dissolve corrosion and precipitation,showing a trend of first increasing and then decreasing;The process of total alkalinity changes in water can be divided into dissolve corrosion stage in initial stage,adsorption stage in medium term,and stable stage in later period;The process of total hardness changes in water can be divided into dissolve corrosion stage in initial stage,adsorption stage in medium term,and dissolve corrosion stage in later period;During the process of purifying water by fracturing coal and rock masses,there is a competitive process of dissolve corrosion,precipitation,and adsorption,and it has obvious timeliness,which has a significant impact on water quality.