Water Retention and Compressibility of a Lime-Treated, High Plasticity Clay

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• 作者：Maria Mavroulidou (1)
  Xiwei Zhang (2)
  Michael J. Gunn (3)
  Zeljko Cabarkapa (4)
  
• 关键词：Lime stabilisation ; London Clay ; Swelling ; Shrinkage ; Compressibility ; Moisture retention
• 刊名：Geotechnical and Geological Engineering
• 出版年：2013
• 出版时间：August 2013
• 年：2013
• 卷：31
• 期：4
• 页码：1171-1185
• 全文大小：875KB
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• 作者单位：Maria Mavroulidou (1)
  Xiwei Zhang (2)
  Michael J. Gunn (3)
  Zeljko Cabarkapa (4)
  
  1. Faculty of Engineering, Science and the Built Environment, London South Bank University, 103 Borough Road, London, SE1 0AA, UK
  2. Research Center for Safe Deep Mining, Northeastern University, No. 11 Lane 3 Wenhua Road, Shenyang, 110819, China
  3. Emeritus Professor of Geotechnical Engineering, Faculty of Engineering, Science and the Built Environment, London South Bank University, 103 Borough Road, London, SE1 0AA, UK
  4. Geotechnical Consulting Group LLP (GCG), 52A Cromwell Road, London, SW7 5BE, UK
  

文摘

The paper presents a laboratory investigation, which quantified the beneficial effect of lime on the water retention, compressibility and overall volume changes of a high plasticity clay (London Clay). The study comprised oedometer testing (including suction controlled testing), shrinkage tests, and filter paper testing to determine the soil water retention curves of the drying soils. The latter tests showed that the shallow-mixed lime-treated soils are likely to be partially saturated in situ depending on the environmental conditions; thus, unsaturated soil mechanics concepts are applicable for the description of their behaviour. The oedometer results quantified the marked decrease in the swelling and compressibility of the lime-treated soil compared to the untreated clay and the increase in the vertical effective yield stress (due to suction and cementation bonding). The lime enabled the soil to maintain a more open structure with respect to the untreated soil throughout the compression process, and appears to be the main factor influencing the compressibility of the unsaturated lime-treated soil (rather than suction) for the ranges of suction tested.