江敏敏,李文伟,向欣,郭兴文,蔡新

• 1:中国长江三峡集团有限公司
• 2:河海大学力学与材料学院

摘要(Abstract)：

【目的】为了准确预测不同胶结材料用量及围压下胶结砂砾石料的应力变形特征，【方法】采用理论推导与试验结果分析相结合的方法，在广义塑性位势理论框架下，依据胶结砂砾石料力学特性三轴试验结果，构建了新的剪切屈服函数和体积屈服函数。结合可反映硬化规律的塑性系数以及加卸载准则，建立了一个双屈服面本构模型，随后对比分析胶结材料用量20 kg/m~3、60 kg/m~3以及100 kg/m~3的胶结砂砾石料三轴剪切试验数据及本构模型的计算值。【结果】研究结果表明，抛物线型剪切屈服函数与椭圆型体积屈服函数可很好地反映胶结砂砾石料的剪切变形与体积变形机制。【结论】新的本构模型充分考虑了胶结材料用量、围压对胶结砂砾石料塑性变形、峰值强度、剪胀性等特性的影响；模型参数共有12个确定简单且物理意义明确的参数；该双屈服面本构模型的应力应变预测值与相应的三轴试验数据基本吻合。

关键词(KeyWords)： 胶结砂砾石料;胶结材料用量;双屈服面;弹塑性模型

Abstract:

Keywords:

基金项目(Foundation): 国家重点研发计划项目课题(2018YFC0406804);; 国家自然科学基金重点项目(U2040222)

作者(Author): 江敏敏,李文伟,向欣,郭兴文,蔡新

DOI: 10.13928/j.cnki.wrahe.2023.03.008

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