潘北矿C_3 I组灰岩水文地质特征及其疏放性评价
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摘要
我国华北型煤田底部煤层开采深受其底板灰岩突水威胁。如何评价及有效防治煤层底板灰岩水问题,对于安全开采煤炭资源具有十分重要的意义。
本文在查阅国内外文献有关煤层底板灰岩水研究现状以及地下水研究方法的基础上,以淮南潘北煤矿为研究对象,通过分析矿区水文地质条件,以-490m水平太原组灰岩为试验巷道,开展C3I组灰岩群孔多阶段放水试验,利用其试验成果系统分析了试验区不同断层的导、隔水性质；结合放水试验数据计算了不同区块的含水层参数,以此为水文地质背景,建立了太原组灰岩水文地质概念模型和数学模型,并进行含水层参数识别和验证。最后,利用突水系数法,结合识别后的灰岩含水层数值模型,分别计算了-490m水平和-650m水平A组煤在安全突水系数下的灰岩疏放水量,为下一步A组煤层疏水降压提供了依据。
Limestone water inrush from coal seam floor is the main water prevention problem in Northern China type coal field. Therefore, how to evaluate and prevent the water disaster from coal seam floor has an important practical significance for how to mine coal resource safely.
Based on consulting foreign and domestic literatures related to research status of coal seam floor of limestone water and its research method, Panbei coal mine was analyzed in Huainan. On the basis of analyzing the hydrogeological conditions of mining areas, the test tunnel of the Taiyuan formation limestone has been constructed at the-490m level, and the multi-stage dewatering test in the C3I limestone groups was carried out. And according to its result, the conductivity and impermeable of different faults in the test area were analyzed systematically. Combined with the dewatering test data, aquifer parameters of the different block were calculated. And on the background of hydrogeological, the hydrogeology conceptual model and the mathematical model of the Taiyuan limestone have been established, and the aquifer parameters of the study area have being identificated and validated. Finally,taken advantage of the inrush coefficient method, and combined with the identified aquifer numerical model, the dewater quantity of limestone under the factor of safety was calculated at levels of-490m and-650m, which provides a basis for the hydrophobic buck of the coal A in the next step.
本文在查阅国内外文献有关煤层底板灰岩水研究现状以及地下水研究方法的基础上,以淮南潘北煤矿为研究对象,通过分析矿区水文地质条件,以-490m水平太原组灰岩为试验巷道,开展C3I组灰岩群孔多阶段放水试验,利用其试验成果系统分析了试验区不同断层的导、隔水性质；结合放水试验数据计算了不同区块的含水层参数,以此为水文地质背景,建立了太原组灰岩水文地质概念模型和数学模型,并进行含水层参数识别和验证。最后,利用突水系数法,结合识别后的灰岩含水层数值模型,分别计算了-490m水平和-650m水平A组煤在安全突水系数下的灰岩疏放水量,为下一步A组煤层疏水降压提供了依据。
Limestone water inrush from coal seam floor is the main water prevention problem in Northern China type coal field. Therefore, how to evaluate and prevent the water disaster from coal seam floor has an important practical significance for how to mine coal resource safely.
Based on consulting foreign and domestic literatures related to research status of coal seam floor of limestone water and its research method, Panbei coal mine was analyzed in Huainan. On the basis of analyzing the hydrogeological conditions of mining areas, the test tunnel of the Taiyuan formation limestone has been constructed at the-490m level, and the multi-stage dewatering test in the C3I limestone groups was carried out. And according to its result, the conductivity and impermeable of different faults in the test area were analyzed systematically. Combined with the dewatering test data, aquifer parameters of the different block were calculated. And on the background of hydrogeological, the hydrogeology conceptual model and the mathematical model of the Taiyuan limestone have been established, and the aquifer parameters of the study area have being identificated and validated. Finally,taken advantage of the inrush coefficient method, and combined with the identified aquifer numerical model, the dewater quantity of limestone under the factor of safety was calculated at levels of-490m and-650m, which provides a basis for the hydrophobic buck of the coal A in the next step.
引文
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