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Bo HUANG, Linfeng CAO, Jiachen GUO, Chunrui XU, Yuchao LI. Centrifuge modeling of contaminant transport in keyed sand-bentonite cutoff walls[J]. Journal of Zhejiang University Science A, 1998, -1(-1): .
@article{title="Centrifuge modeling of contaminant transport in keyed sand-bentonite cutoff walls",
author="Bo HUANG, Linfeng CAO, Jiachen GUO, Chunrui XU, Yuchao LI",
journal="Journal of Zhejiang University Science A",
volume="-1",
number="-1",
pages="",
year="1998",
publisher="Zhejiang University Press & Springer",
doi="10.1631/jzus.A2400148"
}
%0 Journal Article
%T Centrifuge modeling of contaminant transport in keyed sand-bentonite cutoff walls
%A Bo HUANG
%A Linfeng CAO
%A Jiachen GUO
%A Chunrui XU
%A Yuchao LI
%J Journal of Zhejiang University SCIENCE A
%V -1
%N -1
%P
%@ 1673-565X
%D 1998
%I Zhejiang University Press & Springer
%DOI 10.1631/jzus.A2400148
TY - JOUR
T1 - Centrifuge modeling of contaminant transport in keyed sand-bentonite cutoff walls
A1 - Bo HUANG
A1 - Linfeng CAO
A1 - Jiachen GUO
A1 - Chunrui XU
A1 - Yuchao LI
J0 - Journal of Zhejiang University Science A
VL - -1
IS - -1
SP -
EP -
%@ 1673-565X
Y1 - 1998
PB - Zhejiang University Press & Springer
ER -
DOI - 10.1631/jzus.A2400148
Abstract: Soil-bentonite (SB) cutoff walls are commonly used as barriers in polluted areas. The embedded part of an SB wall in an aquitard is crucial for its performance. In this study, a centrifuge modeling test was carried out to investigate the effect of contact between the key and the aquitard on the migration behavior of contaminants within a sand-bentonite cutoff wall. The centrifuge was accelerated to 100g and maintained in-flight for 36 h, equivalent to 41 years of transport time in the prototype. Results showed that the contaminant concentration within the SB wall was higher downstream than in the middle in the thickness direction, and deeper regions exhibited a greater concentration than shallower ones. This concentration distribution indicated that contaminants were transported along the interface between the SB wall and the aquitard, bypassing the base of the SB wall to reach the downstream aquifer rapidly. An improved numerical simulation considering preferential interface migration was performed, which agreed with the centrifuge test results. The simulation results indicated that preferential interface migration, as a defect, significantly accelerated the speed of contaminant migration, reducing the breakthrough time of the SB wall to 1/9 of that without preferential interface migration.
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