Effect of Soil-Particle Size Contrast on Capillary Barrier Performance
Effect of Soil-Particle Size Contrast on Capillary Barrier Performance
复制标题
土壤粒径对比对毛细管屏障性能的影响
DOI：
10.1061/(asce)1090-0241(2001)127:10(885
复制
发表时间：
2001
影响因子：
3.9
通讯作者：
J. Selker
中科院分区：
文献类型：
--
作者：
Jason K. Smesrud;J. Selker
毛细管屏障由覆盖在粗糙土壤上的倾斜的细小土层组成，已被研究作为水力隔离埋藏垃圾的替代方案。根据分析结果可知，当土壤-颗粒尺寸差变得无限大时，水在毛细管屏障界面上的横向分流最大。然而，影响界面完整性和边坡稳定性的实际限制因素制约了合理的粒度对比。本文为毛细管屏障系统中土壤颗粒大小对比度的选择提供了设计指南。结果表明，在细粒材料和粗粒材料之间存在适度的反差时，可以获得接近最大的侧向导流。对于入渗率、界面坡度和细粒材料特性的给定组合，代表最保守的情况，下层粗粒材料仅为覆盖细粒材料的2.5倍时，可以获得80%的最大分流，获得90%的最大分流。
Capillary barriers, consisting of sloping layers of fine over coarse soils, have been investigated as an alternative for hydraulic isolation of buried waste. Based on analytical results, it is known that the lateral diversion of water over a capillary barrier interface is maximized as the soil-particle size contrast becomes infinitely large. However, practical limitations affecting interface integrity and slope stability restrict the reasonable particle-size contrast. In this note, design guidance is provided for selection of soil-particle size contrast in a capillary barrier system. Results indicate that near-maximum lateral diversion of water can be obtained with a modest contrast between the fine and coarse materials of a capillary barrier. For a given combination of infiltration rate, interface slope, and fine material characteristics representing the most conservative case, 80% of the maximum diversion can be obtained with an underlying coarse material that is only 2.5 times coarser than the overlying fine material, 90% of the maximum diversion is obtained.