粗粒土的湿化变形是一种普遍现象,对土石坝长期安全运行至关重要。针对已有多种经验公式拟合精度未知问题,对搜集的试验数据进行验证研究。结果表明:①各向等压湿化体变与围压用幂函数拟合效果较好;②湿化轴向应变与应力水平用指数函数拟合效果较好,指数函数参数与围压呈良好的线性关系;③湿化体变采用双线性模型,形式简单且拟合精度较幂线型及六参数型高;④湿化剪应变与应力水平呈良好的双曲线关系,与围压相关性较弱。最后,分析了湿化应变与不同应力水平的相关程度,建立了基于改进相对湿化应力水平的湿化应变经验公式。
Abstract
The common wetting deformation of coarse grain soil is of crucial importance for the long-term safe operation of earth and rockfill dam. The fitting accuracy of existing empirical formulas is unclear. In view of this,experimental data was collected and verified. Results demonstrated that: 1) the relation between wetting volumetric deformation under constant pressure and confining pressure can be well fitted with power function;2) the relation between wetting axial strain and stress level can be well fitted with exponential function,and the parameters of exponential function are linearly related to confining pressure;3) a bilinear model with simple form for wetting volumetric strain has higher fitting accuracy than the power linear model and the six-parameter model;4) wetting shear strain is in a good hyperbolic relationship with stress level but a weak correlation with confining pressure. In addition,an empirical formula of wetting strain based on modified relative wetting stress level is established by analyzing the correlation between wetting strain and different stress levels.
关键词
湿化应变 /
经验公式 /
应力水平 /
拟合精度 /
相关性分析
Key words
wetting strain /
empirical formula /
stress levels /
fit accuracy /
correlation analysis
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基金
国家自然科学基金重点项目(U1765203);国家自然科学基金面上项目(51979010);中央级公益性科研院所基本科研业务费项目(CKSF2021484/YT)
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