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Investigation of Electrokinetic Method to Reduce Sulphate Induced Heaving inSoils: A Laboratory Study

机译:电动法降低硫酸盐诱导矿井淤积的实验研究

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Samples of soil from SH-118 near Study Bute were obtained with a nominal sulfatecontent of 27,000 ppm. Geotechnical characterization of the soil is highly plastic in nature and consists of 13% (on an average) of soluble components. The chemical characterization in batches indicated sulfate contents of two to three time the nominal value. Specimens of this soil compacted for a Liquidity Index of 50% were subjected to electro-osmosis treatment. The test results indicated a removal rate of 7 mg/day of sulfates after the rate of removal becomes constant. The rate of removal will further decrease to a lower level as more sulfates are removed from the specimen. If this rate can be maintained throughout the treatment process, the completion of the clean up would require several years. This length of time is clearly excessive. Nevertheless, the major problem is posed by the large percentages of soluble components identified in the soil. The removal of all the sulfates would result in the removal of all soluble components. This would result in unallowable increases of the void ratio of the soil.

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