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首页> 外文期刊>Bulletin of engineering geology and the environment >Soil-water retention curves and microstructures of undisturbed and compacted Guilin lateritic clay
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Soil-water retention curves and microstructures of undisturbed and compacted Guilin lateritic clay

机译：原状和压实的桂林红土黏土的保水曲线和微观结构

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摘要

To investigate the soil-water retention curves of undisturbed and compacted lateritic clay specimens in the full suction range, suction is imposed or measured by using the pressure plate method, filter paper and vapor equilibrium technique with a saturated salt solution. The mercury intrusion porosimetry (MIP) tests were also performed to observe the pore size distribution (PSD) of undisturbed and compacted samples. The test results show that the undisturbed samples have lower gravimetric water content and degree of saturation than the compacted samples at the same density in the suction ranging from 0 kPa to 10 MPa. According to the study on microstructures, the observed phenomenon can be explained by internal cracks of undisturbed samples continuing to develop along with an increase in suction. When the suction is higher than 10 MPa, the soil-water retention curves (SWRCs) coincide with each other for both undisturbed and compacted samples. Undisturbed samples exhibit a unimodal PSD, while unsaturated, compacted samples have a distinct bimodal PSD. The structural degradation of the clay aggregate due to the moisture change leads to the change of the inter-aggregate pores (the intra-aggregate pores remain almost unchanged). For unsaturated, compacted samples with different void ratios, the intra-aggregate PSDs are almost the same, while the inter-aggregate PSD varies with the void ratio. This can be adopted to explain that the wetting branches of the SWRCs are independent of the dry density in the high suction range when the SWRC is expressed by the relation between suction and gravimetric water content. The results of MIP tests on a saturated sample are used to predict the SWRC of the same soil in the main drying.
机译：为了研究在完整吸力范围内未扰动和压实的红土粘土试样的土壤保水曲线，使用压板法，滤纸和饱和盐溶液通过蒸汽平衡技术施加或测量吸力。还进行了压汞法（MIP）测试，以观察未扰动和压实样品的孔径分布（PSD）。测试结果表明，在相同密度下，在0 kPa至10 MPa的吸力下，未压实样品的重量含量和饱和度均低于压实样品。根据对微结构的研究，观察到的现象可以用不受干扰的样品的内部裂纹随着吸力的增加而继续发展来解释。当吸力高于10 MPa时，未扰动和压实样品的土壤水分保持曲线（SWRC）彼此重合。不受干扰的样本具有单峰PSD，而不饱和的压实样本具有独特的双峰PSD。由于水分的变化，粘土骨料的结构退化导致骨料间孔的变化（骨料内孔几乎保持不变）。对于具有不同空隙率的不饱和压实样品，聚集体内部PSD几乎相同，而聚集体内部PSD随空隙率而变化。这可以用来解释当SWRC用吸力和重量含水量之间的关系表示时，SWRC的润湿支路与高吸力范围内的干密度无关。对饱和样品的MIP测试结果可用于预测主要干燥过程中相同土壤的SWRC。

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