Abstract This paper presents an experimental study on the effect of polypropylene fibres on the yielding behaviour of cement-admixed soft marine clay. A range of mix ratios is investigated, with the cement content spanning from 20% to 100%. The unconfined compression strength is first examined, followed by isotropic compression and subsequently shearing in triaxial stress conditions. These experimental results are analysed in comparison with unreinforced cement-admixed clay. A three-yield point framework, comprising of the first yield, gross yield and final yield points, is proposed to describe the evolution of the yielding process. The experimental data shows that fibre reinforcement has a greater effect on the size rather than the shape of the yield loci. The volumetric strain of the unreinforced cement-admixed clay matrix has a significant influence on the effectiveness of the fibre reinforcement under isotropic compression, which can be used as a measure of the size of the yield loci. The broad trends of behaviour highlighted in this paper are envisaged to be of use in the construction of constitutive models for fibre-reinforced cement-treated clay.

中文翻译：

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短纤维增强对水泥掺合粘土屈服行为的影响

摘要 本文介绍了聚丙烯纤维对水泥掺合软质海相粘土屈服行为影响的实验研究。研究了一系列混合比，水泥含量从 20% 到 100%。首先检查无侧限压缩强度，然后是各向同性压缩，然后在三轴应力条件下进行剪切。将这些实验结果与未增强的水泥掺合粘土进行比较分析。提出了由第一屈服点、总屈服点和最终屈服点组成的三屈服点框架来描述屈服过程的演变。实验数据表明，纤维增强对屈服轨迹的尺寸而非形状的影响更大。未增强水泥混合粘土基体的体积应变对各向同性压缩下纤维增强的有效性有显着影响，可用作屈服轨迹大小的度量。预计本文中强调的广泛行为趋势可用于构建纤维增强水泥处理粘土的本构模型。