孙疃矿104采区底板灰岩含水层富水性特征及安全开采评价

发布时间：2018-02-03 00:34

本文关键词： 灰岩水防治突水系数富水性灰色理论数值模拟模糊评判法　出处：《安徽理工大学》2013年硕士论文　论文类型：学位论文

【摘要】：淮北煤田作为典型的华北型煤田,水文地质条件复杂,随着开采深度、速度以及规模的增加,煤矿安全开采普遍受到太灰水和奥灰水的严重威胁,也曾发生多次底板突水事故。故本文针对孙疃煤矿104采区底板上段灰岩含水层富水性特征及突水危险性预测与评价进行了多方面研究。本文首先从矿井区域水文地质条件、太灰岩层厚度和岩性组合特征、水化-水力学条件以及岩溶发育情况分析了太原组1～4灰岩水文地质条件以及富水性特征。结果表明,对10煤层开采有影响的太原组1～4灰含水层处于相对封闭的水文地质单元,水文地质条件中等～复杂,岩溶发育不均,水力联系差,富水性弱～中等且差异性较大。同时采用“大井”法和比拟法对采区的涌水量进行了预测,疏放水前,最大涌水量260m3/h,疏放水后,最大涌水量221m3/h。其次利用分形理论分析了煤层底板隔水岩体的完整性,同时建立有限元数值模型预测采动作用下底板应力分布特征及破坏深度值,预测结果与102采区实测底板破坏深度值相近,最终确定煤层底板的最大破坏深度为12.95m。结合研究区内底板岩体总体抗压强度、隔水层厚度和岩层组合情况综合分析了底板阻隔水性能。断层富水性探查结果表明,F5断层带大多充填物以泥岩为主,挤压明显,富水性弱、导水性差,北轨道大巷掘进时无出水现象。最后运用突水系数法和灰色模糊综合评判法对底板突水危险性进行综合预测与评价,并对预测结果进行了参数灵敏度分析。研究区底板以突水相对安全区和威胁区为主,安全区分布在断层不发育,底板相对较稳定区域；而钻孔085、14-5、15-22以及断层F5附近为突水危险区。威胁区和危险区是煤矿生产过程中应重点探查与预防区域。通过区域划分评价底板突水危险性,为煤层开采过程中采取具体的防治水方案和措施提供了依据。
[Abstract]:As a typical North China coal field, Huaibei coalfield has complex hydrogeological conditions. With the increase of mining depth, speed and scale, the safe mining of coal mine is generally seriously threatened by too ash water and Ordovician ash water. There have been many water inrush accidents on the bottom plate, so this paper studies the water-rich characteristics of limestone aquifer and the prediction and evaluation of the water inrush risk in the upper section of the bottom plate in Suntuan Coal Mine 104. In this paper, the characteristics of hydrogeological conditions, thickness and lithology combination of Tai-limestone layer in the mine area are first discussed in this paper. The hydrogeological conditions and water-rich characteristics of No. 1 limestone in Taiyuan formation are analyzed in terms of hydration-hydraulics and karst development. The No. 4 ash aquifer of Taiyuan formation, which has influence on the mining of 10 coal seam, is located in a relatively closed hydrogeological unit, with moderate to complex hydrogeological conditions, uneven karst development and poor hydraulic connection. At the same time, the "big well" method and the analogy method are used to predict the water inflow in the mining area. Before the drainage, the maximum water inflow is 260 m3 / h, after the drainage. The maximum discharge capacity is 221m3 / h. Secondly, the integrality of water-barrier rock mass of coal seam floor is analyzed by using fractal theory, and the finite element numerical model is established to predict the stress distribution characteristics and failure depth value of bottom slab for mining action. The predicted results are close to the measured failure depth of floor in 102 mining area, and the maximum failure depth of coal seam floor is determined to be 12.95 m. The overall compressive strength of floor rock mass in combination with the study area is determined. The water barrier performance of the bottom plate is analyzed synthetically by the thickness of the water-barrier layer and the rock combination. The results of water-rich exploration show that most of the filling materials in the fault zone are mudstone, extrusion is obvious, water enrichment is weak, and the water conductivity is poor. Finally, the water inrush risk of bottom slab is forecasted and evaluated by using water inrush coefficient method and grey fuzzy comprehensive evaluation method. The sensitivity of the prediction results is analyzed. The main parts of the study area are the water inrush relative safety zone and the threat area. The safety zone is located in the area where the fault is not developed and the bottom plate is relatively stable. Borehole 0855-5. 15-22 and near fault F5 are dangerous areas of water inrush. Threat areas and dangerous areas are the areas that should be explored and prevented in the process of coal mine production, and the risk of water inrush on the floor is evaluated through the division of regions. It provides the basis for the concrete water prevention plan and measure in the coal seam mining process.
【学位授予单位】：安徽理工大学
【学位级别】：硕士
【学位授予年份】：2013
【分类号】：P641.4;TD74

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