Hardfill材料非线性弹性本构模型研究  

Study on nonlinear elasticity constitutive model of Hardfill material

作　　者：刘俊林 何蕴龙[2] 熊堃 李建成[5] 

机构地区：[1]广东粤港供水有限公司,广东深圳518021 [2]武汉大学水资源与水电工程科学国家重点实验室,湖北武汉430072 [3]长江勘测规划设计研究院,湖北武汉430010 [4]国家大坝安全工程技术研究中心,湖北武汉430010 [5]中国水电顾问集团昆明勘测设计研究院,云南昆明650000

出　　处：《水利学报》2013年第4期451-461,共11页Journal of Hydraulic Engineering

基　　金：国家自然科学基金资助项目(50679058);中国博士后科学基金(2012M511594);国家大坝安全工程技术研究中心开放基金(NDSKFJJ1103)

摘　　要：在砂砾料中掺入少量胶凝材料得到了一种新的低强度筑坝材料——Hardfill材料,其力学性能介于碾压混凝土和土石料之间,应力-应变关系具有明显的弹塑性性质和应变软化等特性。在已有研究的基础上,通过理论和数学分析,提出了能够反映Hardfill材料应变软化特性、参数物理意义较为明确的六参数非线性弹性本构模型,并给出了详细的参数确定过程。将该本构模型应用于坝高100m的Oyuk坝进行非线性有限元分析,结果表明:应用非线性本构模型计算所得坝体应力和变形分布规律与线弹性计算结果基本一致;因坝体应力水平较低,材料基本处于线弹性状态,非线性计算所得应力值与线弹性结果相差不大;而在坝趾等应力水平较高的部位,非线性计算所得应力集中值明显较小。Hardfill material is a new material with low strength in which the granular materials are solidi fied with some cementing material. The nature of the special material is between RCC and soil, which has typical features as elasticplastic material in its stressstrain relations and obvious behavior of strain soften ing. On the summary of the early researches, a nonlinear elasticity constitutive model for Hardfill material was put forth. The constitutive model can indicate the strain softening behavior accurately and all of the six parameters have specific physical interpretation and can be determined by material uniaxial and triaxial test using the given solution procedure. The verified constitutive model was applied to the Oyuk dam, a typical Hardfill dam at 100m level. The results show that the distribution of the stress and deformation is mainly accordant in both the nonlinear and linear elastic calculation, and there is little difference because of the low stress level. However, the stress is obviously smaller in the nonlinear calculation than the linear elas tic result in the high stress level at the toe of the dam.

关 键 词：Hardfill材料 非线性弹性 本构模型 应变软化 

分 类 号：TV649[水利工程—水利水电工程]