基于热力学的堆石体本构模型的研究与应用  

Research and Application of a Rockfill's Constitutive Model Based on Thermodynamics

作　　者：王晓玥[1] 杜丽惠[1] 金鑫鑫[1] 李翠[1] 

机构地区：[1]清华大学水沙科学与水利水电工程国家重点实验室,北京100084

出　　处：《水力发电》2015年第12期58-62,共5页Water Power

基　　金：国家自然科学基金资助项目(11372156)

摘　　要：堆石体的本构模型对其应力变形分析尤为重要。在热力学条件下,分析堆石坝筑坝过程中应力比的变化过程,推导出符合能量守恒定律的堆石料本构模型,给出吉布斯自由能函数指数的范围。在闭合应力路径下模型符合热力学定律,能够反映堆石料的非线性、压硬性等主要工程性质,参数少且独立、物理意义明确。以水布垭面板堆石坝为例,采用热力学本构模型进行了有限元计算,与实测资料相比,其计算结果比其他模型更加符合实际,进一步验证了模型的可靠性。The constitutive model of rockfill is very important to its stress and deformation analysis. Under thermodynamic conditions, the stress ratio changes during the building course are analyzed, a constitutive model that confornas to the law of conservation of energy is derived and the range of the Gibbs free energy function index is calculated. This model conforms to the laws of thermodynamics and the energy is conservative in the closure stress path. It can reflect the rockfill materials＇ properties of nonlinear and pressure rigidity. The model has few parameters which are independent and have clear physical meanings. The model is used to calculate Shuibuya CFRD and the finite element results are compared with the measured data. The results show that the model is more realistic than others and thus further verifying the reliability of model.

关 键 词：面板堆石坝 本构模型 吉布斯自由能 

分 类 号：TU452[建筑科学—岩土工程]