煤矿奥灰水预测理论与方法研究

发布时间：2018-04-30 00:45

本文选题：奥灰水 + 监测层　；参考：《太原理工大学》2013年硕士论文

【摘要】：我国煤矿突水灾害严重,特别是华北煤田。当前我国华北煤田主采石炭二叠纪煤层,煤层底板下方几十米处即为含水量巨大的奥陶纪灰岩含水层。奥灰水突水事故一旦发生,突水量很大,短时间内可能淹没矿井,很难在短时间内疏水排干,救援工作很难展开,会造成巨大的经济损失和人员伤害。本文通过对两次奥灰水突水事故原因的分析,分析了奥灰水突水的机理,说明了奥灰水突水预测预报研究的必要性和可能性。奥灰水突水主要是通过原生的导水构造发生的,在煤层开采之前有煤层保护,突水事故不会发生,开采煤层时采掘工作面一旦与导水构造相遇则会发生突水事故。在太原理工大学的MTI奥灰水突水预测预报方法的基础上,本文进行了煤矿奥灰水突水危险区域划分方法的研究。并且将该突水危险区域划分方法应用于煤矿奥灰水突水监测预报系统中,进行实际工程应用。 MTI奥灰水突水预测预报方法主要是选取煤层底板以下,奥陶纪灰岩含水层之上的小含水层作为监测层,通过对监测层的计算与分析,进行奥灰水突水的预测预报。本文首先研究了对煤层底板含水层进行有限元计算的方法和有限元程序的编制。计算方法为选取矿区范围一定的区域作为计算区域,对计算区域进行有限元计算网格的剖分,确定计算区域的边界条件和含水层的参数,建立含水层的渗流模型,然后进行有限元程序的计算。计算结果为含水层计算区域内各个节点的水位值。通过对监测含水层与奥陶纪灰岩含水层的有限元计算结果的分析与研究,本文提出了煤矿奥灰水突水危险区域的划分的两种方法。一是根据监测层的计算水位与实际水位的计算误差的突水危险区域判别方法；二是根据监测层与奥陶纪灰岩含水层的水位差的突水危险区域判别方法。两种奥灰水突水危险区域划分方法均是通过有限元计算出计算区域内各个节点的突水危险指数,通过不同的判别指标,划分出矿区奥灰水不同等级的突水危险区域。以李雅庄煤矿与赵庄煤矿为实例,本文将所提出的煤矿奥灰水突水危险区域的划分方法应用于工程实际中。首先,根据矿区的实际水文地质条件与对两家煤矿的煤层底板的奥陶纪灰岩含水层与作为监测层的太原组灰岩含水层进行计算区域的选取、计算网格的剖分、边界条件的确定等。然后,通过矿区内含水层简化的渗流模型对含水层进行有限元计算。根据计算结果绘制出矿区内奥陶纪灰岩含水层等水位线、作为监测层的太原组灰岩含水层等水位线和矿区内的奥灰水突水危险区域划分。最后,根据矿区实际情况对计算结果进行分析与总结。
[Abstract]:The water inrush disaster of coal mine in our country is serious, especially in North China coalfield. At present, the Permian coal seam of the main quarrying coal field in North China is the Ordovician limestone aquifer with huge water content several tens meters below the floor of the coal seam. Once the water inrush accident of Ordovician ash occurs, the amount of water inrush is very large, which may submerge the mine in a short time, it is very difficult to drain water in a short time, and the rescue work is difficult to carry out, which will cause huge economic loss and personnel injury. Based on the analysis of the causes of two Ordovician water inrush accidents, the mechanism of Ordovician water inrush is analyzed, and the necessity and possibility of prediction and prediction of Ordovician water inrush are explained. The water inrush of Ordovician ash occurs mainly through the primary water diversion structure, which is protected by coal seam before coal seam mining, and the water inrush accident will not occur. Once the mining face meets with the water diversion structure, the water inrush accident will occur when the coal seam is opened. Based on the prediction and prediction method of MTI Ordovician water inrush in Taiyuan University of Science and Technology, this paper studies the method of dividing the dangerous area of Ordovician water inrush in coal mine. The method is applied to the monitoring and forecasting system of Ordovician water inrush in coal mine. The main method of water inrush prediction in MTI is to select the small aquifer above the Ordovician limestone aquifer as the monitoring layer, and to forecast the water inrush of the Ordovician through the calculation and analysis of the monitoring layer. In this paper, the finite element method and program for calculating coal seam floor aquifer are studied. The calculation method is to select a certain area in the mining area as the calculation area, to divide the calculation area into finite element calculation meshes, to determine the boundary conditions and the parameters of the aquifer, and to establish the seepage model of the aquifer. Then the finite element program is calculated. The calculated results are the water level values of each node in the aquifer calculation area. Based on the analysis and study of the finite element calculation results of monitoring aquifer and Ordovician limestone aquifer, two methods of dividing the dangerous area of water inrush of Ordovician water in coal mine are put forward in this paper. The first is the method of distinguishing the dangerous area of water inrush according to the calculation error between the calculated water level and the actual water level of the monitoring layer, and the second is the method of distinguishing the dangerous area of water inrush from the water level difference between the monitoring layer and the limestone aquifer of the Ordovician. The two methods are used to calculate the water inrush risk index of each node in the area by finite element method, and to divide the dangerous area of Ordovician water inrush into different grades by different discriminant indexes. Taking Liyazhuang coal mine and Zhaozhuang coal mine as examples, this paper applies the method of dividing the dangerous area of water inrush of Ordovician ash in coal mine to engineering practice. First of all, according to the actual hydrogeological conditions of the mining area and the selection of the calculation area of the Ordovician limestone aquifer of the coal seam floor of the two coal mines and the Taiyuan formation limestone aquifer as the monitoring layer, the calculation grid is divided. The determination of boundary conditions, etc. Then, the aquifer is calculated by finite element method through the simplified seepage model of the aquifer in the mining area. According to the calculation results, the water level line of Ordovician limestone aquifer in the mining area, the water level line of Taiyuan formation limestone aquifer as the monitoring layer, and the dangerous area of Ordovician water inrush in the mining area are drawn. Finally, according to the actual situation of the mining area, the calculation results are analyzed and summarized.
【学位授予单位】：太原理工大学
【学位级别】：硕士
【学位授予年份】：2013
【分类号】：TD745

【参考文献】