Kamann Patrick J, Ritzi Robert W, Dominic David F, Conrad Caleb M
Department of Earth and Environmental Sciences, Wright State University, Dayton, OH 45435, USA.
Ground Water. 2007 Jul-Aug;45(4):429-38. doi: 10.1111/j.1745-6584.2007.00313.x.
Porosity in sediments that contain a mix of coarser- and finer-grained components varies as a function of the porosity and volume fraction of each component. We considered sediment mixtures representing poorly sorted sands and gravely sands. We expanded an existing fractional-packing model for porosity to represent mixtures in which finer grains approach the size of the pores that would exist among the coarser grains alone. The model well represents the porosity measured in laboratory experiments in which grain sizes and volume fractions were systematically changed within sediment mixtures. Permeability values were determined for these sediment mixtures using a model based on grain-size statistics and the expanded fractional-packing porosity model. The permeability model well represents permeability measured in laboratory experiments using air- and water-based permeametry on the model sediment mixtures.
含有粗细颗粒混合成分的沉积物孔隙度会随着每种成分的孔隙度和体积分数而变化。我们考虑了代表分选差的砂和含砾砂的沉积物混合物。我们扩展了现有的孔隙度分数填充模型，以表示细颗粒接近仅由粗颗粒构成时所存在孔隙大小的混合物。该模型很好地体现了实验室实验中测得的孔隙度，在这些实验中，沉积物混合物中的粒度和体积分数是系统变化的。使用基于粒度统计和扩展后的分数填充孔隙度模型的模型，确定了这些沉积物混合物的渗透率值。该渗透率模型很好地体现了在模型沉积物混合物上使用基于空气和水的渗透仪进行实验室实验时测得的渗透率。
