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首页> 外文会议>Pan-American conference on unsaturated soils >Comparative Analysis of Water Retention Curves of Residual Soils of Gneiss, Granite and Diabase, Compacted under Optimum Moisture Conditions
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Comparative Analysis of Water Retention Curves of Residual Soils of Gneiss, Granite and Diabase, Compacted under Optimum Moisture Conditions

机译：在最佳水分条件下压实的片麻岩，花岗岩和辉绿岩残留土壤保水曲线的比较分析

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Three Brazilian tropical soils are studied: residual soil of diabase, granite, and gneiss. The water retention curves of these soils were determined using compacted specimens under the optimum moisture conditions of their respective compaction curves. For the residual soil of gneiss, water retention curve was obtained with the use of suction plate, pressure plate, and filter paper. Granite and diabase residual soils have the water retention curves determined using filter paper technique following the drying path after initial saturation of the specimen. Characterization tests, determination of the grain size distribution curve, and resistance parameters were made to complement the experimental studies. The higher compaction density of the granite residual soil, associated with its higher clay fraction, is reflected in a higher air entry value. For water moisture contents of less than 25%, a stabilization of volumetric variations of the tested specimens during the drying procedure is observed in order to determine the water retention curve.
机译：研究了三种巴西热带土壤：辉绿岩，花岗岩和片麻岩的残留土壤。这些土壤的保水曲线是在各自压实曲线的最佳湿度条件下，使用压实的样品确定的。对于片麻岩的残留土壤，使用吸板，压板和滤纸获得保水曲线。花岗岩和辉绿岩残留土壤的吸水率曲线是用滤纸技术根据样品最初饱和后的干燥路径确定的。进行表征测试，确定晶粒尺寸分布曲线和电阻参数以补充实验研究。花岗岩残积土的较高压实密度及其较高的粘土分数反映在较高的空气进入值中。对于小于25％的水分含量，在干燥过程中观察到被测样品的体积变化稳定，以确定保水曲线。

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