Effect of Suction on Resilient Modulus of Compacted Fine-Grained Subgrade Soils
Effect of Suction on Resilient Modulus of Compacted Fine-Grained Subgrade Soils
复制标题
吸力对压实细粒路基土回弹模量的影响
DOI：
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发表时间：
2009
期刊：
影响因子：
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通讯作者：
C. Benson
中科院分区：
文献类型：
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作者：
A. Sawangsuriya;T. Edil;C. Benson
压实路基土体的回弹模数是路面结构力学-经验设计中所要求的主要力学性质。在大多数情况下，回弹模数是在单一压实条件下(即接近最佳含水率并在最大干容重的指定百分比下)制备的试件。然而，在现场，回弹模数随着含水率的变化和相应的基质吸力的变化而变化。描述了四种细粒压实路基土的回弹模数与吸力的关系。根据NCHRP 1-28A，对从每个土壤制备的不同基质吸力条件下的试件进行了回弹模量试验。总回弹模数随基质吸力的增大而增大。这种关系是通过使用模数比来量化的，该模数比被定义为在特定吸力下的总回弹模数与参考总回弹模数的比率。考虑了两个参考汇总模数：在最佳压实条件下和在饱和状态下。所有土体的模数比与基质吸力的对数呈线性关系。
Resilient modulus of compacted subgrade soils is the primary mechanical property required in the mechanistic–empirical design of pavement structures. In most cases, the resilient modulus is determined of a specimen prepared at a single compaction condition (i.e., near optimum water content and at a specified percentage of maximum dry unit weight). However, in the field, the resilient modulus changes in response to changes in moisture content and corresponding changes in matric suction. The relationship between resilient modulus and suction is described for four fine-grained compacted subgrade soils. Resilient modulus tests were conducted in accordance with NCHRP 1-28A on test specimens prepared from each soil and conditioned to different matric suctions. The summary resilient modulus increases with increasing matric suction. This relationship is quantified empirically by using a modulus ratio, defined as the ratio of the summary resilient modulus at a particular suction to a reference summary resilient modulus. Two reference summary moduli were considered: at optimum compaction conditions and at saturation. The modulus ratio is linearly related to the logarithm of matric suction for all soils.