基于灰色模糊模型的塔山煤矿构造复杂程度定量评价

Quantitative Assessment of Structural Complexity in the Tashan Coal Mine Based on the Grey Fuzzy Model

为实现大同煤田塔山煤矿构造复杂程度的定性-定量综合分析和分区评价,本次研究充分收集研究区钻孔实测数据和井田详查和勘探阶段的区调资料,以及各煤层采掘工程平面图,统计了研究区近百条褶皱和断裂构造产状、落差和延伸长度等参数,绘制了研究区构造纲要图。厘定了断层密度、断层强度、断层影响指数和褶皱的平面变形系数4个构造评价指标,应用灰色模糊综合评价模型计算了因素权重和程度权重基础上的双权重,并利用GIS进行了网格化和定量化分析,并探讨了不同构造等级区对勘探和开采工作的影响。结果表明,塔山矿构造复杂程度整体较高,构造复杂程度呈“区带状”分布,包括3条北西-南东向展布的红-橙色高构造复杂区带,和间夹的3条紫-蓝色低构造复杂区带。不同等级构造区构造复杂程度的主控因素存在差异,Ⅰ级至Ⅱ级构造区内,构造复杂程度主要受褶皱的平面变形系数影响,而Ⅱ级至Ⅲ级构造区内,断层密度、断层强度和断层影响指数是主控因素,权重系数占比较高;Ⅰ级至Ⅱ级构造区勘探井网和采煤工作面的布置难度较低,适用于机械化程度高的综采设备,而Ⅱ级至Ⅲ级构造区勘探井网和采煤工作面的布置难度较大,卡钻和漏液风险高,且对开采设备的机动性要求也较高。

The purpose of this work was to realize the qualitative-quantitative comprehensive analysis and zoning evaluation of the structural complexity of the Tashan coal mine in the Datong coalfield,Shanxi Province.A full collection was made on data of drilling and regional and coalfield geology,exploration and the mining planar diagrams of each coal seam.In addition,the occurrence,falls and extension lengths of folds and faults in the study area were counted,and a structural outline map was prepared.The fault density,fault strength,fault influence index and plane deformation coefficient of fold were determined.Double weights based on factor and degree weights were calculated using the grey fuzzy comprehensive evaluation model.Grid and quantitative analyses were carried out using GIS,and the influence of areas with different structural grades on exploration and mining was examined.Results show that the structural complexity of the Tashan coal mine is relatively high,characterized by strip shape,consisting of three NW-SE trending red-orange high structural complex zones and three purple-blue low structural complex zones.The plane deformation coefficients of folds affect the structural zones of gradeⅠto gradeⅡ,while zones of gradeⅡto gradeⅢare controlled by fault structure.Such structural complexity should be taken into consideration for the layout of well pattern in the exploration process and the design and arrangement of mining working faces.