摘要
运用统计方法,给出了堆石料动剪模量比衰减及阻尼比增长的平均曲线表达式。建立了反映堆石料非线性和滞回性的变参数R-O模型,讨论了模型参数R,及参考剪应变的计算方法。推导了堆石料的增量耗散函数表达式,在热力学基本定律的框架下,研究了堆石料的屈服函数,讨论了其动力变形机理和第2阈值应变。对进一步认识筑坝堆石料动应力变形特性有一定意义。
The expressions for the mean curves of the attenuation of dynamic shear modulus ratio and the increase of damping ratio of rockfill materials are given by means of the statistical methods. A modified R-O constitutive model with variable parameters, which reflects the nonlinearity and hysteresis of rockfill materials, is established. The model parameters R, a and reference shear strain are discussed. Based on the modified model, a dynamic dissipation incremental function is formulated. Then the corresponding yield surface and energy dissipation characteristics are analyzed based on the generalized thermodynamics, and the mechanism of dynamic stress-strain and the second threshold strain are discussed for rockfill dam materials.
出处
《岩土工程学报》
EI
CAS
CSCD
北大核心
2012年第12期2307-2311,共5页
Chinese Journal of Geotechnical Engineering
基金
国家自然科学基金项目(50979014
51179024)
高等学校博士学科点专项科研基金项目(20090041110016)
关键词
堆石料
变参数R-O模型
耗散函数
阈值应变
rockfill material
R-O constitutive model with variable parameters
energy dissipation function
threshold strain
