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Assessment of the effects of the structure on the compression behaviour of a young alluvial silty soil

机译：评估结构对年轻冲积粉质土压缩特性的影响

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A comprehensive series of tests was performed to investigate the effects of the in-situ structure and sample preparation technique on the compression behaviour of a shallow young alluvial silty soil. Two different particle size distributions were investigated by testing intact, compacted, and slurry samples in an oedometer. The compression of the slurry samples, created at different initial water contents, gave a unique intrinsic compression line for one of the two distributions. This was used as a reference for analysing the effects of the structure of the compacted and intact specimens. The compacted samples were prepared by means of static and dynamic compaction in one or more layers with vertical holes simulating those created by plant roots in natural samples. The results showed that a unique normal compression line is defined regardless of the number of layers or the number of holes, with a clear effect of the structure when compared to the slurry samples. The significant effects of the in-situ structure of the intact samples were observed even at high stress levels. An important finding was the non-uniqueness of the compression line for the second distribution. For the case of the slurry samples, the compression lines remained parallel to each other even at high stress levels, whereas a unique line was found for the compacted samples. These results are contrary to those often given in the literature, namely, that the sample preparation technique can create very robust initial structures resulting in a mode of behaviour that has been called "transitional". The research also emphasises how the quantification of the natural structure is critically dependent on the way in which the intrinsic samples are prepared. (C) 2019 Production and hosting by Elsevier B.V. on behalf of The Japanese Geotechnical Society.
机译：进行了一系列综合测试，以研究原位结构和样品制备技术对浅层年轻冲积粉质土壤压缩特性的影响。通过在里程表中测试完整，压实和浆状样品，研究了两种不同的粒度分布。在不同的初始含水量下产生的浆料样品的压缩，对于两种分布之一给出了独特的固有压缩线。这被用作分析压实和完整样本结构影响的参考。压实的样品是通过静态或动态压实在一层或多层中制备的，其中垂直孔模拟了自然样品中植物根部产生的垂直孔。结果表明，无论层数或孔数如何，均定义了唯一的法向压缩线，与浆液样品相比，具有明显的结构效果。即使在高应力水平下，也可以观察到完整样品原位结构的显着影响。一个重要发现是第二分布的压缩线不唯一。对于浆料样品，即使在高应力水平下，压缩线也保持彼此平行，而对于压实样品，发现了一条独特的线。这些结果与文献中经常给出的结果相反，即样品制备技术可以产生非常坚固的初始结构，从而导致一种行为模式，这种行为模式被称为“过渡性”。该研究还强调了天然结构的定量如何严格取决于内在样品的制备方法。 （C）2019年由Elsevier B.V.代表日本岩土工程学会制作和主持。

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