淮北朱仙庄煤矿侏罗系地质特征研究

朱仙庄煤矿北部侏罗系砾岩含水层水害严重威胁下伏8煤的安全开采，在侏罗系钻孔岩心系统观测的基础上，结合钻探和物探资料综合分析，进而探讨了“五含”岩性特征、分布规律和地质结构特征。研究表明，朱仙庄煤矿侏罗系表现为单层结构、双层结构和三层结构的地层组合发育特征，“五含”厚度分布表现为“北部厚南部薄、东部厚西部薄”的特征，西部和南部隐伏露头区“五含”沿其地层倾向方向发生急剧增厚，主要受控于后期构造和剥蚀影响。“五含”构造特征表现为受控于近NS向延伸、向N倾伏向斜构造的发育，W翼平缓、呈NW-SE向展布；E翼相对较陡、为近N-S向F₂₁逆断层所截切。新鲜“五含”主要为致密紫红色细砾岩、中砾岩和粗砾岩，分选性差，砾石成分以灰岩为主，“五含”砾岩成岩后遭受强烈的岩溶和风化作用、且非均质性极强。

Jurassic geological characteristics of Zhuxianzhuang Coal Mine in Huaibei Coalfield

The water damage of Jurassic conglomerate aquifer in the north of Zhuxianzhuang Coal Mine seriously threatens the safe mining of underlying 8 coal.On the basis of systematic observation of Jurassic drilling core，combined with drilling and geophysical data comprehensive analysis the lithologic characteristics，distribution rules and geological structure characteristics of the fifth aquifer were discussed.The results showed that the Jurassic in the reach areas is characterized by stratigraphic assemblages of single layer，double layer and three layer structures.The thickness distribution is characterized by thicker thickness in the north than that in the south；and thicker thickness in the east than that in the west.The fifth aquifer thicken sharply along its dip direction in the hidden outcrop areas in the west and south，which is mainly controlled by late structure movement and denudation.The structure characteristics of the fifth aquifer are controlled by the syncline which is almost NS direction trending and plunging to the north.The west wing of the syncline is gentle and extends in the NW-SE direction.The east wing of the syncline is relatively steep and truncated by the thrust fault F21 which is near N-S trending.The fresh "fifth aquifer" are mainly dense purplish red fine conglomerate，medium conglomerate and coarse conglomerate，with poor separability.The gravel composition is mainly limestone，which is strongly and differentially subjected to karst and weathering，and is highly heterogeneous.