榆神矿区导水裂隙带发育规律研究

发布时间：2018-06-25 15:08

本文选题：榆神矿区 + 导水裂隙带　；参考：《西安科技大学》2017年硕士论文

【摘要】：本文以榆神矿区区域地质资料为依据,总结了榆神矿区煤层与含(隔)水层空间组合类型。采用钻孔探测、经验公式及数值模拟三种方法研究研究区导水裂隙带发育高度(以下简称“导高”),通过对比分析发现,经验公式计算得出的导高与现场实测测出的导高有一定的差距。由于采用经验公式法计算时考虑的因素不够全面,导致计算结果误差较大,经验公式在研究区具有一定的局限性。数值模拟得出的导高结果比经验公式法计算得出的结果更加接近现场实测结果,数值模拟方法优于经验公式法,而且耗费时间短、费用低。钻孔探测法在这三种方法中最为准确,但是耗费时间长、费用太高。综合分析可知数值模拟方法是可靠可行经济实用的。采用三维数值模拟方法,根据塑性条件、破坏准则及应力判别,模拟出不同含(隔)水层空间组合类型和不同采厚以及不同工作面长度下的导高,总结出不同影响因素与导高及裂采比的相关关系。应用数值模拟方法预测出研究区导高,归纳总结出研究区导水裂隙带发育规律。具体取得如下研究成果:(1)统计当煤层采厚5m时,不同的煤层-含(隔)水层空间组合类型区域的裂采比具有一定的差异:砂土基型区域裂采比26.45,砂基型区域裂采比27.86,基岩型区域裂采比19.67,土基型区域裂采比24.63,烧变岩型区域裂采比22.34。砂基型(隆德,27.86)的裂采比数值较大,而基岩型(薛庙滩,19.67)裂采比数值较小。导水裂隙带高度随着含砂量增大而增大,随着基岩含量的增大而减小。(2)对数值模拟方法与钻孔探测法、经验公式法的导水裂隙带发育高度计算结果进行了对比分析,得出数值模拟方法是可靠可行经济实用的(3)研究区范围内不同煤层采厚及不同工作面条件下导水裂隙带发育规律如下:煤层采厚与导高呈正相关关系,煤层采厚在3.5m～5m时,裂采比最大。煤层导高及裂采比随着工作面的增大而减小。(4)研究区四期规划区的导高发育规律:研究区四期规划区导高主要分布在40～160m范围内,规划区西南部导高最大,可达200m以上。(5)研究区导水裂隙带危险性分为安全区和危险区两类,安全区内导水裂隙带未突破首采煤层上覆基岩,分布在三期、四期的全区,二期中南部以及一期西南部局地;危险区内导水裂隙带突破首采煤层上覆基岩,集中在一期大部及二期的北部、东部。
[Abstract]:Based on the regional geological data of Yushen mining area, this paper summarizes the spatial combination types of coal seam and water-bearing layer in Yushen mining area. By means of borehole exploration, empirical formula and numerical simulation, the development height of water-conducting fracture zone in the area is studied (hereinafter referred to as "conducting height"), and it is found by comparison and analysis, There is a certain gap between the calculated conductance height obtained by empirical formula and that measured in situ. Because the factors taken into account in the calculation by empirical formula method are not comprehensive enough, the error of calculation results is large, and the empirical formula has some limitations in the study area. The results obtained by numerical simulation are closer to the measured results compared with those calculated by empirical formula method. The numerical simulation method is superior to the empirical formula method and has the advantages of short time consumption and low cost. Borehole detection is the most accurate of the three methods, but time-consuming and expensive. Comprehensive analysis shows that the numerical simulation method is reliable, feasible, economical and practical. According to plastic condition, failure criterion and stress discrimination, the three dimensional numerical simulation method is used to simulate the different spatial combination types and mining thickness of different water layers, as well as the guiding heights under different working face lengths. The correlation between different influencing factors and conductance height and fracture-production ratio was summarized. Numerical simulation method is used to predict the conductivity of the study area, and the law of the development of the fracture zone of the study area is summarized. The main results are as follows: (1) when the coal seam is 5 m thick, There are some differences in the fracture-mining ratio of different types of spatial assemblages between coal seams and water-bearing beds: 26.45 in the sandy soil type, 27.86 in the sand base, 19.67 in the bedrock, 24.63 in the soil-base, and 24.63 in the soil-based zone. The regional fracture-mining ratio of metamorphic rock type is 22.34. The fracture-production ratio of the sand base type (Londou 27.86) is larger than that of the bedrock type (Xue Miao Tan (19.67). The height of the water-conducting fracture zone increases with the increase of sand content and decreases with the increase of the bedrock content. (2) the calculation results of the height of the water-conducting fissure zone by the numerical simulation method, the borehole detection method and the empirical formula method are compared and analyzed. It is concluded that the numerical simulation method is reliable, feasible, economical and practical. (3) in the study area, the development law of the fracture zone in different coal seam mining thickness and different working face is as follows: the coal seam mining thickness is positively correlated with the guiding height, and the coal seam mining thickness is in 3.5m~5m. The ratio of split to mining is the largest. The height of coal seam and the ratio of coal seam to coal face decrease with the increase of working face. (4) the law of the development of guiding height in the fourth stage planning area of the study area: the leading height of the fourth stage planning area of the study area is mainly distributed in the range of 40 ~ 160 m, and that of the southwest part of the planning area is the largest. (5) the risk of water diversion fissure zone in the study area can be divided into two categories: safe area and dangerous area. The water conduction fissure zone in the safety zone does not break through the overburden rock of the first mining seam, and is distributed in the whole area of the third, fourth, the second, the central and the southwest of the study area. In the dangerous area, the water conduction fissure zone breaks through the overlying bedrock of the first mining coal seam, and is concentrated in the north and east of the first most and second stage of the coal seam.
【学位授予单位】：西安科技大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TD163.1;P641.461

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