杨村矿新生界底部松散沉积物特征及其演化分析

Cenozoic Basal Loose Sediment Characteristics and Evolutional Analysis in Yangcun Coalmine

通过对杨村矿区新生界底部松散层形成的背景、沉积层厚度、影响因素、沉积物结构等综合分析,得出砾石层、砂层厚度和粘土层厚度在空间分布呈非均匀性的特征,以及沉积物颗粒成分含量在剖面上变化特点。并依此分析了底部含水层形成时的沉积环境,包括冲—洪积环境、坡积环境和河流环境等,以及整个环境的演化过程。研究成果为今后矿井在浅部开采过程中,对于底部松散含水层富水性程度的认识、留设防水煤岩柱类型和合理高度提供重要的参考依据。

Through aggregate analysis of the Cenozoic basal loose sediment formative setting, thickness, impacting factors and sedimentary texture, worked out the thickness spatial distribution heterogeneity of gravel, sand and clay layers, as well as different changing patterns of sediment granularity on sections because of different grain size. On this basis, has analyzed the sedimentary environment of the basal aquifer during its formation that including alluvial-pluvial, talus and stream environments, and their evolutional process. The result provides important reference frame to cognition of basal loose sediment aquifer water yield property, type and reasonable height of safety pillars against water during the mining in shallow part.