宿南矿区地下水系统演化规律模拟研究

发布时间：2018-04-25 23:20

本文选题：宿南矿区 + 数值模拟　；参考：《合肥工业大学》2017年硕士论文

【摘要】：我国煤矿水文地质条件极为复杂,地表及以下往往是由多含水层构成的复杂地下水系统。本文以安徽省淮北煤田宿县矿区为研究区,选择宿南矿区新生界松散层第四含水层地下水,二叠系煤系砂岩裂隙含水层地下水、石炭系太原组灰岩岩溶裂隙含水层地下水和奥陶系灰岩岩溶裂隙含水层地下水为研究对象。将宿南矿区含水层概化为6个含水层,系统收集矿区2009年7月至2014年7月水文地质资料与水化学资料。利用FEFLOW建立多层含水层地下水流数值模型,进行三个模拟期的模拟运算,从地下水位、水压和渗流速度场角度分析地下水流场空间特征。在此基础上,结合含水层水化学特征,分析与探讨地下水流场时空特征及其演化规律,并预测宿南矿区水化学场的演化趋势。研究结果表明:宿南矿区地下水流场与水化学场耦合程度较高,主要受宿南褶皱与西寺坡断层影响,从3煤砂岩裂隙含水层开始往下逐渐减弱。宿南矿区含水层整体上被宿南背斜与西寺坡断层划分为西部、中部和东部三个区域,其中东部新生界松散层第四含水层拥有独立的地下水循环系统,西部邹庄矿与中部祁南矿的二叠系煤系砂岩裂隙含水层、东部朱仙庄矿与中部桃园矿的石炭系太原组灰岩岩溶裂隙含水层地下水存在紧密的水力联系。在邹庄矿和露头风化带区域,二叠系煤系砂岩裂隙含水层地下水向上部含水层越流。三个模拟期计算过程中,宿南矿区地下水位持续下降,常规水化学离子含量逐年降低,但涌水区域TDS含量有增高的趋势。随着矿区进一步开采,未来地下水流场及水化学场将会延续当前发展趋势。本文建立可靠的地下水数值模型,可为将来华北隐伏型煤矿水害防治及地下水源识别提供理论支持。
[Abstract]:The hydrogeological conditions of coal mines in China are extremely complex, and the surface and below are often complex groundwater systems composed of multiple aquifers. In this paper, taking Suxian mining area in Huaibei coalfield, Anhui Province as the study area, the groundwater of the fourth aquifer of the Cenozoic loose stratum and the groundwater of the fissure aquifer of the Permian coal series sandstone are selected. The groundwater of limestone karst fissure aquifer and Ordovician limestone karst fissure aquifer of Taiyuan formation of Carboniferous are studied. The aquifer of Sunan mining area is generalized into 6 aquifers and hydrogeological data and hydrochemical data from July 2009 to July 2014 are collected systematically. The numerical model of groundwater flow in multi-layer aquifer is established by FEFLOW. The spatial characteristics of groundwater flow field are analyzed from the angle of groundwater level, water pressure and seepage velocity field. On this basis, combined with the characteristics of aquifer hydrochemistry, the temporal and spatial characteristics of groundwater flow field and its evolution law are analyzed and discussed, and the evolution trend of hydrochemical field in Sunan mining area is predicted. The results show that the coupling degree of groundwater flow field and hydrochemical field in Sunan mining area is relatively high, mainly affected by Sunan fold and West Sipo fault, and gradually weakened from the third coal-sandstone fissure aquifer. As a whole, the aquifer in Sunan mining area is divided into the west, the middle and the east by the Sunan anticline and the West Sipo fault. The fourth aquifer of the eastern Cenozoic loose layer has an independent groundwater circulation system. There is a close hydraulic relationship between Zouzhuang mine in the west and the Permian coal series sandstone fissure aquifer in the central Qinan mine, and the karst fissure aquifer of limestone in Taiyuan formation of Carboniferous in the eastern part of Zhuxianzhuang mine. In the weathering zone of Zouzhuang mine and outcrop, the groundwater overflows in the fractured aquifer of Permian coal-bearing sandstone. During the calculation of the three simulation periods, the groundwater level in Sunan mining area continued to decrease, and the chemical ion content of conventional water decreased year by year, but the TDS content in the water gushing area increased. With the further mining of the mining area, the future groundwater flow field and hydrochemical field will continue the current development trend. In this paper, a reliable numerical model of groundwater is established, which can provide theoretical support for the prevention and control of underground water hazards and the identification of underground water sources in hidden coal mines in North China in the future.
【学位授予单位】：合肥工业大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：P641.461

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