论文部分内容阅读
针对北皂海域煤矿顶板岩层的隔水性问题,进行了顶板岩样的渗透性试验。根据岩样渗透率变化与其破坏过程的对应关系,分析了全应力-应变过程中岩样渗透性随其变形变化的特点及渗透率-应变和渗透率-应力之间的关联性。结果表明,北皂海域煤矿顶板为典型的软岩,可分为砂岩、泥岩和含粗砾砂岩3组,全应力-应变过程岩样渗透率变化过程可划分为压密-弹性段、峰前屈服段、峰后段3个区间;砂岩与含砾粗砂岩、泥岩相比,其变形破坏曲线更为均匀;用临界抗渗强度与峰值强度的比值或临界抗渗应变与最大渗透率应变的比值能较好反映软岩渗透率变化规律。
According to the problem of water barrier in coal seam roof strata in Bei soap sea area, the permeability test of roof rock samples was carried out. According to the correspondence between the change of rock permeability and its failure process, the relationship between rock permeability change and stress-strain and permeability-stress is analyzed. The results show that the coal roof in Beizaohai area is a typical soft rock, which can be divided into three groups: sandstone, mudstone and coarse gravel sandstone. The permeability change of the whole stress-strain process can be divided into compaction-elastic section, Yield zone and post-peak zone. The deformation and failure curves of sandstone and gravel coarse sandstone and mudstone are more uniform. The ratio of critical impervious strength to peak strength or critical impermeable strain and maximum permeability strain The ratio can better reflect the variation of soft rock permeability.