Water Retention and Compressibility of a Lime-Treated, High Plasticity Clay
Water Retention and Compressibility of a Lime-Treated, High Plasticity Clay
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DOI：
10.1007/s10706-013-9642-6
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发表时间：
2013-04
影响因子：
1.7
通讯作者：
M. Mavroulidou;Xiwei Zhang;M. Gunn;Z. Cabarkapa
中科院分区：
文献类型：
--
作者：
M. Mavroulidou;Xiwei Zhang;M. Gunn;Z. Cabarkapa
本文介绍了一项实验室研究，量化了石灰对高塑性粘土（伦敦粘土）的保水性、压缩性和总体体积变化的有益影响。研究包括水分计试验（含吸力控制试验）、收缩试验和滤纸试验，以确定干燥土壤的土壤保水曲线。后一试验结果表明，不同的环境条件下，浅混石灰处理的土壤有可能在原位发生部分饱和；因此，非饱和土力学概念适用于描述其行为。与未处理的粘土相比，石灰处理的土壤的膨胀性和压缩性显著降低，垂直有效屈服应力（由于吸力和胶结）增加。在整个压缩过程中，石灰使土相对于未处理土保持更开放的结构，并且在吸力测试范围内，石灰似乎是影响非饱和石灰处理土（而不是吸力）可压缩性的主要因素。
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.