新朝川矿矿井水分布规律研究与防治对策
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摘要
本文是在全面的收集朝川矿以往地质资料、水文地质资料的基础上,对整合后的新朝川矿地质条件、水文地质条件进行了系统的分析和研究。通过分析发现新朝川矿矿井地质条件复杂,断层发育,尤其是井田深部的小断层,极为发育。矿井水文地质条件同样较复杂,新朝川矿充水含水层共有九层,其中最主要的两个含水层是寒武系灰岩岩溶裂隙含水层及石炭系太原组灰岩岩溶裂隙含水层,这两个含水层富水性强、水头压力高且相互之间由于构造裂隙存在水力联系,是矿井突水的主要水源,而主采煤层二1煤底板隔水层厚度小且分布不稳定,再加上构造裂隙、采动裂隙的影响,二1煤底板隔水层仅在局部地段起一定的隔水作用,致使新朝川矿受水害威胁较严重。
     新朝川矿矿井水的主要补给来源是大气降水和地表水体的下渗,补给边界主要是井田西南边界的灰岩露头区;矿井的充水水源主要是大气降水、地表水体、老窑积水和煤层底板岩溶裂隙水;导水通道主要是断裂带、裂隙带、封闭不良钻孔及探放水钻孔;矿井水充水因素主要是断层、裂隙、水压和矿压及其相互间的综合作用。
     本文采用多种方法对矿井涌水量进行预测,其中大井法+直线法预测的涌水量值Q正常= 1140.5 m3/h与矿井实际涌水量值最为接近。通过对矿井水文地质条件的分析、研究和矿井涌水量的计算,确定新朝川矿矿井水文地质条件类型为复杂型。
     针对新朝川矿矿井地质条件及水文地质条件的实际情况,本文提出了适合新朝川矿矿井水防治的方法和措施,即以疏水降压为主,注浆堵水、底板注浆加固为辅,多种方法相合。
Based on the comprehensive collection of past geological and hydrogeologic data about Chaochuan mine, this paper systematically analyzed and researched the geological and hydrogeological conditions of the newly integrated Chaochuan mine. According to analysis, it’s found that new Chaochuan mine conditions are very complex and faults are developed, especially, the small faults in deep mine field are well developed . The mine hydrogeological conditions are the same complex. There are nine layers in water-filled aquifers of the new Chaochuan mine totally, in which the two most important aquifers are Cambrian limestone karst aquifer and Carboniferous Taiyuan Formation limestone karst aquifer. The two aquifers, having strong water enrichment and high water pressure, hydraulic connection are existed between them due to tectonic fractures, which are main source of water bursting in coal mine. However, the thickness of water-resisting layer of the main coal bedⅡ1 Coal motherboard is very thin and distributes unstably, and then companied with the impact of structural fissures and mining-induced fractures, the water-resisting layer ofⅡ1 Coal bed motherboard can obstruct water only in some local sections to a certain extent, leading to new Chaochuan mine seriously threatened by water damage.
     The main supply source mine water of new Chaochuan mine is atmospheric precipitation and infiltration of surface water, and mainly replenishment boundary is limestone outcrop areas in south-west border. Mine water filling sources are primarily precipitation, surface water bodies, gob water and coal floor karst fissure water. Water conducting channels are mainly fault zone, fracture zone, closed non-performing drilling and exploration drilling drainage; mine water filling factors are defaults, fissures, water pressure and rock pressure and the combined effects of them.
     In this paper, a variety of methods are used to predict mining water inflow, in which the value of virtual large diameter well method plus straight-line method, Qnormal = 1140.5m3/h is closest to actual mining water inflow. Through the analysis and research of hydrogeologic conditions, calculation of mining water inflow, the hydrogeologic condition type of new Chaochuan mine water is identified complex type.
     Aimed at the actual situation of geological and hydrogeological conditions of new Chaochuan mine, this paper presents the prevention and control methods which are suitable for new Chaochuan mine water, that is conditions of new Chaochuan mine, this paper presents the prevention and control methods which are suitable for new Chaochuan mine water, that is mainly to decompression by draining off water, and supplemented by sliping casting to cut off water and reinforce motherboard , and a number of ways combined together .
引文
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