An engineering classification for certain basalt-derived lateritic soils
An engineering classification for certain basalt-derived lateritic soils
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DOI：
10.1016/0013-7952(77)90037-0
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发表时间：
1977-12
影响因子：
7.4
通讯作者：
E. R. Tuncer;R. A. Lohnes
中科院分区：
文献类型：
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作者：
E. R. Tuncer;R. A. Lohnes
适用于“温带”土壤的工程分类通常不能预测红土的田间性能，因为分类所依据的指标试验对红土并不总是可重复的。对来自夏威夷和波多黎各的12种红土样品（均来自玄武岩，但代表不同的风化阶段）进行了工程和矿物学试验。固体的比重随着风化程度的增加而增加;强度和孔隙比都随着风化程度的增加而呈现出系统的趋势。这些结果表明，分类的基础上比重和空隙比。比重小于3.05和孔隙比大于1.25的土壤具有低粘聚力（小于20 psi）和低内摩擦角（小于35°）;而孔隙比在1.25和0.9之间的土壤具有较高的粘聚力。在孔隙比低于0.9的土壤中，粘聚力和摩擦角的值更大。比重大于3.05和孔隙比大于1.25的土具有低粘聚力和高摩擦角。因此，通过测量这些土的孔隙比和比重，可以估计它们的强度。
Engineering classifications which are useful for “temperate” zone soils usually fail to predict the field performance of lateritic soils, because the index tests upon which the classifications are based are not always reproducible for lateritic soils. Undisturbed and disturbed samples of twelve lateritic soils from Hawaii and Puerto Rico, all derived from basalt but representing various stages of weathering were subjected to engineering and mineralogic tests. The specific gravity of the solids increases as the degree of weathering increases; and both strength and void ratio exhibit systematic trends with increased weathering. These results suggest a classification based upon specific gravity and void ratio. Soils with specific gravities less than 3.05 and void ratios greater than 1.25 have low cohesion (less than 20 psi) and low internal friction angles (less than 35°); whereas soils with void ratios between 1.25 and 0.9 have higher cohesions. Still greater values for cohesion and friction angles are noted in soils with void ratios lower than 0.9. Soils with specific gravities greater than 3.05 and void ratios greater than 1.25 have low cohesion but high friction angles. Thus by measuring the void ratio and specific gravity of these soils one can estimate their strength.