Effects of aggregate size on water retention capacity and microstructure of lime-treated silty soil
Effects of aggregate size on water retention capacity and microstructure of lime-treated silty soil
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DOI：
10.1680/jgele.15.00127
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发表时间：
2015-12
影响因子：
2.1
通讯作者：
Yejiao Wang;Yu-Jun Cui;A. Tang;C. Tang;N. Benahmed
中科院分区：
文献类型：
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作者：
Yejiao Wang;Yu-Jun Cui;A. Tang;C. Tang;N. Benahmed
石灰处理是一种常用的改善土壤工作性和岩土性质的技术。在本研究中，研究了团聚体尺寸对石灰处理土壤的持水能力和微结构的影响。制备了两种不同最大团聚体粒径(Dmax=0.4 mm和5 mm)的土粉，并用2%的石灰(按干土重量计)进行了稳定化。土样在最佳含水率(w=17%)的干侧压实，干密度为1.65 mg/m~3。测定了不同固化时间后的吸力和孔径分布。结果表明：(A)Dmax较小的处理土壤具有相对较小的模式尺寸和较低的大孔隙出现频率(10-330μm)；(B)石灰的添加有效地提高了土壤的持水能力，并随着时间的推移逐渐减小了大小和微孔隙的模式大小。此外，Dmax值越小，进气量越大，保水能力越大。
Lime treatment is a common technique of improving the workability and geotechnical properties of soils. In this study, the aggregate size effects on the water retention capacity and microstructure of lime-treated soil were investigated. Two soil powders with different maximum aggregate sizes (Dmax = 0·4 and 5 mm) were prepared and stabilised by 2% lime (by weight of dry soil). Soil samples were prepared by compaction at dry side of optimum water content (w = 17%) with a dry density of 1·65 Mg/m3. Suction and pore size distribution were determined after different curing periods. The results obtained show that: (a) the treated soil with smaller Dmax presents relatively smaller modal sizes and lower frequency of macropores (10–330 μm); (b) lime addition effectively improves the soil water retention capacity and decreases both the modal sizes of macro- and micropores gradually over time. Moreover, a higher air entry value and larger water retention capacity were also observed for a smaller Dmax value, in agre...