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本文提出的关于低塑性土的概念,是土工程分类的基础研究成果。作者从“阿太堡界限”、粒度成分、工程性状特别是抗液化特性等方面,研究了大量试验资料后,认为:在砂土与粘性土之间存在着一种过渡性的土类,这具有独特的工程性质;“阿太堡界限”对于塑性指数小于10的土的适用性值得商榷;这种过渡性的低塑性土与粘性土不同,也与砂土有别,应当把它们区分出来。分析研究表明,粉粒含量对土的工程性状有很大的影响;建议用粒度成分评价低塑性土,以大于0.05mm颗粒含量75%作为低塑性土与砂土的界限看来是恰当的。应当注意的是,以粘性土有效的室内试验和原位试验的经验,评价低塑性土的工程性质,常得不到正确的结果。正确地理解和鉴别低塑性土对于工程勘察和设计有着重要的实践意义。
The concept of low-plastic soil proposed in this paper is the basic research result of soil engineering classification. After studying a large amount of experimental data from the “Ataibao boundary”, particle size composition, engineering characteristics, and particularly anti-liquefaction properties, the authors believe that there is a transitional soil category between sandy soil and cohesive soil. It has unique engineering properties; the applicability of the “Atebao Boundary” to soils with a plasticity index of less than 10 is questionable; this kind of transitional low-plasticity soil is different from clayey soil, and it is also different from sandstone. They should be distinguished. . Analytical studies have shown that the content of powder particles has a great influence on the engineering properties of soils; it is recommended to evaluate low-plasticity soils with grain size components. The boundary between low-plasticity soil and sand appears to be appropriate with a particle content of more than 0.05 mm and 75%. It should be noted that the evaluation of the engineering properties of low-plasticity soils with the experience of effective laboratory tests and in-situ tests of clay soils often fails to yield correct results. Correctly understanding and identifying low-plasticity soils has important practical significance for engineering survey and design.