平遥二亩沟煤矿开采对洪山泉域岩溶地下水资源影响的数值模拟研究

发布时间：2018-02-24 09:43

本文关键词： 洪山泉域煤矿开采岩溶地下水环境数值模拟　出处：《太原理工大学》2015年硕士论文　论文类型：学位论文

【摘要】：山西是我国北方诸省中碳酸盐岩分布最多、最广的省份，同时也是煤炭大省。随着煤矿开采深度的加深，煤系地层上覆的含水层造成不同程度的破坏，煤系地层下伏的岩溶水已成为工业与城市、农村生活的主要供水水源。近年来，洪山泉域内煤矿开采排水对岩溶地下水环境产生较大影响，因此加强煤矿开采对洪山泉域水环境影响的研究具有十分重要的意义[1]。本论文以平遥二亩沟煤矿为例，分析了洪山泉域及二亩沟煤矿井田地质和水文地质条件，考虑对11号煤层带压区采取降压疏水措施[2]，选取了洪山泉域的一个子区域部分作为此次的研究区域，在系统分析地下水数值模拟方法的基础上，运用有限差分法，，采用三维非稳定流数学模型对研究区地下水系统进行了数值模拟。首先应用Visual modflow建立水文地质概念模型和数学模型[3]，对研究区域地下水动态变化进行了评价；其次用该水流模型预测二亩沟煤矿采取岩溶水疏排措施对洪山泉岩溶地下水的影响，为煤矿开采与洪山泉域岩溶地下水资源的保护提供依据[4-5]，为区域地下水资源的科学管理提供了有意义的参考。主要研究内容有：第一前期进行项目背景下的野外水文地质调查及项目周边范围的取用水情况调查，并收集相关的地质及水文地质资料。第二在调查和分析资料的基础上，概括总结和阐述二亩沟煤矿井田和洪山泉域研究区的自然地理、地质和水文地质条件等。概化研究区水文地质特点，提出研究区水文地质概念模型。建立研究区非均质三维非稳定流数学模型，利用有限差分法进行数值求解。第三根据实际水文地质特征离散研究区域，对目标含水层的渗透系数、弹性释水系数等水文地质参数进行分区，利用背景项目调查和实测资料进行模型识别和校验，经过识别与检验的地下水数值模型可直接用于研究区地下水的动态预测。第四利用以上的水流模型，预测了当二亩沟煤矿开采11号煤层采取了对带压区疏排奥陶系岩溶水措施时研究区域岩溶地下水动态变化的影响：即在二亩沟煤矿井田中东部突水系数0.06—0.07MPa/m之间的地段布设1口疏水井进行降压，100d后形成以疏水井为中心的降水漏斗，漏斗中心的水位降深约为32m，影响面积约为5.34km2；150d后漏斗中心的水位降深约为54m，影响面积约为13.29km2。并做出相关预测结果分析、提出建议和岩溶水保护措施。
[Abstract]:Shanxi is China's northern provinces in the carbonate rock distribution, most provinces, at the same time the coal big province. With the mining depth deepening, coal bearing strata overlying aquifer caused varying degrees of damage, under the coal stratum karst water Volt has become the industry and the city, the main source of water supply in rural life. In recent years, Hongshan in spring area of coal mining drainage have great influence on karst groundwater environment, thus strengthening the [1]. is of great significance to study Hongshan spring area water environmental impact of coal mining
This paper takes Pingyao two acres of coal mine as an example, analysis of the Hongshan spring area and two Mu Gou coal mine geological and hydrogeological conditions, considering of No. 11 coal seam pressure area pressure drainage measures [2], selected a sub area of Hongshan spring area as the study area of this, based on the analysis of simulation method the groundwater numerical simulation, using the finite difference method, the three-dimensional unsteady flow mathematical model of groundwater system is studied by numerical simulation. We establish the [3] model and the mathematical model of hydrogeological conceptual application of Visual MODFLOW, the dynamic changes of groundwater in the study area were evaluated; prediction of two acres of coal mine karst water drainage measures take effect the karst groundwater of Hongshan Spring followed by the flow model, provide the basis for the protection of [4-5] coal mining and Hongshan karstic groundwater resources, to the regional groundwater resources Scientific management provides a meaningful reference. The main contents are:
First, the field hydrogeological survey and water intake survey of the surrounding area under the background of the project were carried out, and the related geological and hydrogeological data were collected.
Second based on the investigation and analysis of data, summarizes and expounds the natural geography of two acres of coal mine and Hongshan ditch spring field, geological and hydrogeological conditions. Generalized hydrogeological characteristics of the study area, the hydrogeological conceptual model of the study area. The study area of heterogeneous 3-D unsteady flow mathematical model. Was solved numerically by finite difference.
Third according to the actual hydrogeological characteristics of the discrete research area, the permeability coefficient of aquifer, elastic water release coefficient of hydrogeological parameters of partition, model identification and verification of the background of project investigation and measured data, the groundwater numerical model identification and verification can be directly used for the dynamic prediction of groundwater in the study area.
The flow model using the above fourth, when two acres of forecast ditch coal mine No. 11 coal seam has taken effect on dynamic change of regional karst groundwater pressure drainage area Ordovician karst water measures: between two Mu Gou coal mine east water inrush coefficient 0.06 - 0.07MPa/m 1 wells hydrophobic sections laid buck, 100D after the formation of precipitation funnel to drain well as the center of the water level drawdown funnel center is about 32m, the influence area is about 5.34km2; 150D after the water level drawdown in funnel center is about 54m and the affected area is about 13.29km2. and make the prediction results analysis, suggestions and karst water protection measures.

【学位授予单位】：太原理工大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：P641.8

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