【摘要】 以表征岩体渗透性的单位吸水量ω为参数,采用基于像元的去丛聚效应方法有效地分析了裂隙岩体的渗透性空间分布规律。将研究区的单位吸水量ω筛选并经权系数校正后,研究发现岩体渗透性参数ω服从对数正态分布规律;各地层的ω均值有较大差异,表现出层状渗透结构特征;断层影响带中含泥量最少的T41地层,其渗透性明显大于其它区同地层的渗透性,表现出带状渗透结构特征。在此研究的基础上,再将去丛聚效应方法应用到渗透性垂向变化规律的研究,结果表明全区及各分区ω在一定范围内随埋深表现出负指数分布规律,表现出壳状渗透结构特征。这些规律为裂隙岩体的渗流计算和模拟奠定了基础。更多还原

【Abstract】 Based on the Cell Declustering the statistical distribution and spatial variation of permeability are analyzed.It is founded that the statistical distribution of permeability is lognormal,the mean values of permeability in each sub-formation are different significantly which is a sign of layering structure of permeability,and the permeability in T⁴₁ formation with a low content of mud stone in the fault zone is drastically greater than that in other regions which indicates the belting structure of permeability.Based on these results,the cell Declustering is used to analyze the vertical distribution of permeability.It is found that the permeability in the whole study area and in each sub-region shows the negative exponential distribution with the depth,which signifies the shelling structure of permeability.The laws lay a foundation for the seepage simulation in the similar study areas.更多还原