HYDRAULIC CONDUCTIVITY OF COMPACTED BENTONITE SAND MIXTURES
HYDRAULIC CONDUCTIVITY OF COMPACTED BENTONITE SAND MIXTURES
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DOI：
10.1139/t92-042
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发表时间：
1992-06-01
影响因子：
3.6
通讯作者：
SUNGAILA, MA
中科院分区：
文献类型：
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作者：
KENNEY, TC;VANVEEN, WA;SUNGAILA, MA
在没有不透水的天然土壤的情况下，已经使用膨润土和沙子的压实混合物来形成流体屏障，本文的重点是这些压实混合物的水力传导特性。实验结果表明，膨润土砂含量、压实水含量、系统化学和系统化学变化对膨润土砂的影响。一些研究结果如下：(1)低导水率要求混合物中膨润土基质的连续性，而这反过来又要求膨润土含量和膨润土分布（即混合）足够；（ii）在含有高达20%干质量膨润土的压实混合物中，沙子形成了支撑荷载的框架，并在宏观层面上赋予混合物尺寸稳定性（抗裂性）；（iii）含淡水膨润土和高膨润土的混合物，在强盐水溶液中渗透时，其导电性只增加了少量，这表明封闭在砂框架内的膨润土的结构受这种系统化学变化的影响很小。
In the absence of impervious natural soils, compacted mixtures of bentonite and sand have been used to form barriers to fluids, and the focus of this paper is on the hydraulic conductivity behaviour of these compacted mixtures. Results of laboratory investigations are presented to show the influences of bentonite-sand content, compaction water content, system chemistry, and changes of system chemistry. Some of the findings are as follows: (i) low hydraulic conductivity requires continuity of the bentonite matrix within the mixture, and this in turn requires both adequate bentonite content and adequate bentonite distribution (i.e., mixing); (ii) in well-compacted mixtures containing up to 20% bentonite in dry mass, sand forms the load-supporting framework and gives the mixtures dimensional stability at the macro level (crack resistance); and (iii) the hydraulic conductivity of mixtures containing freshwater, high-swell bentonite, when permeated with a strong saline solution, increased by only small amounts, suggesting that the fabric of bentonite enclosed within the sand framework was little influenced by this change of system chemistry.