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工程力学  2012 

不同应力路径下石灰岩碎石力学特性的大型三轴试验研究

DOI: 10.6052/j.issn.1000-4750.2010.11.0828, PP. 195-201

Keywords: 高填方,石灰岩碎石,应力路径,大型三轴试验,剪胀,剪切强度

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Abstract:

为了解不同应力路径下,昆明新机场石灰岩碎石填料的力学特性及该填料力学特性受水影响的程度,采用大型三轴试验机,对该填料进行不同应力路径下的三轴试验及等σ′3压缩应力路径下的干湿对比试验。结果表明:Δσ′1≥0时,围压和应力比k(即小主应力增量与大主应力增量的比值)增大,试件峰值应力及初始模量亦增大,但剪胀逐渐受到抑制;石灰岩碎石的剪胀及剪缩特性与应力路径有很强的相关性;石灰岩碎石的强度非线性特征显著,围压减小的应力路径下,试件剪切强度比等σ′3应力路径下略低;水对石灰岩碎石的剪切强度、初始模量及剪胀性有较大影响。该文的试验成果可为构建考虑应力路径影响的高填方粗颗粒填料本构模型提供试验基础。

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