全、强风化砂岩填料粗细比对渗透系数影响研究

在我国西南地区广泛分布有厚度较大的全、强风化砂岩，可将其部分应用于填方工程中；影响该类填料渗透性的因素有很多，研究填料粗细比对渗透系数的影响，通过加强对水的控制，来提高填料的强度。针对不同粗细比的全、强风化砂岩击实试样进行变水头渗透试验，结果显示：当粗细比为4∶6时，不均匀系数 Cu 为45．5，曲率系数 Cc 为12．85时，渗透系数最小为1．8×10－6 cm／s 。此外，将渗透系数 k 分别与 Cu 、Cc 和 Cu Cc 进行拟合分析，结果显示：渗透系数 k 与 Cu Cc 的相关度最大，并通过拟合得到渗透系数关于不均匀系数与曲率系数的经验公式。该公式对于降低填料含水率并提高强度有重大意义，可进一步用于对填料粗细比的评价。

Pepmeability Coefficient Influenced by Gradation Characteristics of the Full and Strong Weathered Sandstones Filler

Lots of full and strong weathered sandstone is distributed in southwest China ,which can be applied to fill en-gineering .There are many factors influencing the permeability of filler ,this paper focuses on the filler grading on the per-meability coefficient ,by controlling the amount of water and the strength of it can be efficiently improved .This research carry out the variable head permeability experiments on the whole and strong weathered sandstone compacted samples with different grading cases .The experiment results are as follows ,when the grading ratio is 4∶6 ,the uniformity coefficient is 45 .5 and the curvature coefficient is 12 .85 ,the minimum permeability coefficient is 1 .8 × 10 - 6 cm/s .Finally ,fitting analysis about permeability coefficient ,uniformity coefficient and curvature coefficient are finished .The results showed that the permeability coefficient has the greatest association with Cu Cc .The empirical formula about the permeability co-efficient can be derived ,the uniformity coefficient and the curvature coefficient ,which has a significant influence of de-creasing the moisture content of the filler and improving the strength of it ,and the grading of it can be evaluated further .