Electro-Osmotic Consolidation Studies on Peat and Clayey Silt Using Electric Vertical Drain |
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Authors: | Shenbaga R Kaniraj H L Huong J H S Yee |
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Institution: | (1) Curtin University, CDT 250, 98009 Miri, Sarawak, Malaysia |
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Abstract: | Peat and soft soil deposits are abundant in Malaysia. Studies using electrokinetic geosynthetics (EKG) such as prefabricated
electric vertical drains (EVD or ePVD) have shown the potential for the application of these materials in electrokinetic strengthening
of soft clays and increasing solids content in mining tailings and sludges. There are no studies reported on the effectiveness
of electro-osmosis using EVD in peat. Laboratory experiments were carried out to investigate the effectiveness of electro-osmotic
stabilization of two peat samples and a slightly organic clayey silt sample, from the North Sarawak region. Commercially available
EVD was used to induce electro-osmosis and drainage of pore water. The influence of voltage gradient, organic content, initial
water content, anode–cathode configuration and presence of roots on electro-osmotic consolidation was investigated. Electro-osmotic
consolidation using EVDs was effective in the improvement of peat, over a large range of initial water contents. An increase
in the voltage gradient generally improved consolidation. The maximum voltage gradient for optimum results appeared to be
in the region 120 V/m. The 2anodes-1cathode configuration performed better than the 1anode-1cathode configuration. The presence
of roots reduced the electro-osmosis effect. |
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