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为了阐明华北隐伏型煤矿深部含水层补给条件,以淮北煤田临涣矿区任楼煤矿为例,采用水化学系统聚类分析与氢氧同位素示踪技术,结合采矿活动影响,分析与探讨煤矿深部含水层中的地下水补给源及其变化机制。研究表明:矿区深层地下水形成机制为大气降水直接但不均匀入渗、滞留入渗以及古地下水混合。矿区深层地下水当总溶解固体(TDS)小于1 000 mg/L时,氢氧稳定同位素组成(δ值)随着TDS的增大而减小;当TDS大于1 000 mg/L时,δ值在平均值线附近。矿区深层地下水平均δD与δ18O分别为-67.4‰与-8.68‰,小于大气降水年平均δD与δ18O(δD=-52.4‰,δ18O=-7.80‰)。在未经采矿活动影响下,矿区深层地下水主要来源于大气降水直接但不均匀入渗补给形成的;经采矿活动影响后深部含水层长期向采空区充水,原地下水循环条件已被打破,在补给区水力交替加快,滞留于地表或土壤层的大气降水补给深部含水层。
In order to clarify the supply conditions of the deep aquifer in the hiding coal mine in North China, taking the Renlou Coal Mine in Linqu Mining Area, Huaibei Coalfield as an example, the water chemistry cluster analysis and hydrogen and oxygen isotope tracing techniques were used to analyze and discuss the deep water cut in coal mines Groundwater Recharge Source in Layer and Its Changing Mechanism. The research shows that the formation mechanism of deep groundwater in the mining area is direct but inhomogeneous infiltration, infiltration and infiltration of the groundwater and ancient groundwater. When the total dissolved solids (TDS) of mining area is less than 1 000 mg / L, the δ-value of hydrogen and oxygen stable isotope decreases with the increase of TDS. When TDS is higher than 1 000 mg / L, Near the average line. The average groundwater depth δD and δ18O in the mining area are -67.4 ‰ and -8.68 ‰ respectively, less than the annual average δD and δ18O (δD = -52.4 ‰, δ18O = -7.80 ‰) of the precipitation. Under the influence of mining activities, the deep groundwater in the mining area comes mainly from the direct but uneven infiltration and recharge of atmospheric precipitation. After deep mining aqueduct has been filled with water from the deep aquifer for a long time, the original groundwater circulation conditions have been broken, In the recharge area, the hydraulic alternation accelerates, and the precipitation in the ground or soil layer recharges the deep aquifer.