【作者】 魏广庆；

【导师】 成春奇；

【作者基本信息】 安徽理工大学 ， 地质工程， 2005， 硕士

【摘要】 板集井田为全隐伏井田,上覆有厚达500多米的巨厚新生界松散层,其底部含水层富水性直接影响着该矿井今后的防水煤柱留设类型及厚度。本文利用钻孔取芯的土工试验了解底部松散沉积物的粒度成分、渗透性能及压缩性,通过多元统计推求出渗透系数与其它参数指标间的统计关系,并用其关系函数对渗透系数进行了预测。结合钻孔资料与实验结果推求出底部松散层钻孔尺度下导水系数与平均渗透系数等水文地质参数,试用地质统计学对各水文地质参数进行空间变异结构与各向异性分析,并据此对各参数进行了空间最优估计,得出了各参数平面分布规律。综合各水文地质参数分布特征对底部松散层进行富水性分区及评价,并利用抽水试验资料进行对比验证,最后综合分析煤层露头分布、井田构造和富水性分布的基础上,评价了新生界底部松散层对煤层开采影响,并对浅部煤层开采防水煤柱留设进行了提议。更多还原

【Abstract】 The Banji coalfield is a concealed coalfield absolutely covered with large-thick cenozonic unconsolidated layers which is thicker than 500 meters ,so the water abundance degree of its lowermost aquifers directly effect on the type and thickness of the waterproof coal pillars for producing safely in the future. One of the main purposes of this paper is obtaining the statistical relationship between penetrability coefficient and the indexes of granulometric composition and compressibility, gained by geotechnical experiment on core of the loose sediments lowermost part of the cenozonic strata , through multivariate statistical approach, and used it to predict very core sample’s penetrability coefficient. Combined those experimental result and drill information to ascertain the lowermost aquifers’ hydrogeological parameters of core-scale,such as water conduction coefficient, average penetrability coefficient, etc. The other purpose is application of spatial optimal estimation to model the panel distribution of per hydrogeological parameters based on their anisotropic distributions and spatial variance structures identified by geostatistical theory. Divided the lowermost unconsolidated aquifers into different water abundance subarea for water abundance appraise, according to all hydrogeological parameters’ distribution synthetically, and be validated by the result of pump testes. At last, appraised the influence on excavating permain coal seam in each subarea integrated with distributions of coal seam outcrop and coalfield tectonics, given advice on setting aside waterproof coal pillars according to relevant regulations for superficial coal seam exploitation.更多还原