Hydraulic Flow through Engineering Bentonite-Based Containment Barriers | Science Publications

American Journal of Applied Sciences

Devapriya Chitral Wijeyesekera¹  Eric Wooi Kee Loh¹ 

关键词: Bentonite;    Containment Barriers;    Leachate;    Cation Exchange;    Advective and Diffusive Flow;   

DOI  :  10.3844/ajassp.2015.785.793

学科分类：自然科学（综合）

来源: Science Publications

【 摘 要 】

This paper presents the use ofsoftware modelling as a tool to study the impact of hydraulic “resistivity” onthe contaminant transport through bentonite-based containment barriers. Asensitivity analysis on the predicted data was carried out by varying the boundaryconditions as well as the hydraulic resistance to flow through varyingcontaminant transport parameters. Accordingly, both advective and diffusiveflow processes are considered as that which resists the flow. In particular,the effect on the contaminant migration due to desiccation cracking isexplored. Laboratory evidence is provided and discussed to show how the initialmicrostructure of the clay influences the development of subsequent macrostructural features such as shrinkage crack patterns. The effect of thesecracks and the intensity of cracking on the contaminant migration are modelledand pragmatically discussed. Additionally, the effect on the hydraulicconductivity of bentonite-based barriers, when permeated with non-standardliquids is discussed and a typical analytical output is presented.

【 授权许可】

Unknown