绿片岩三轴流变力学特性的研究(II):模型分析  

Investigation on triaxial rheological mechanical properties of greenschist specimen (II): model analysis

作　　者：徐卫亚[1] 杨圣奇[1] 谢守益[2] 邵建富[2] 王义锋[3] 

机构地区：[1]河海大学岩土工程研究所,南京210098 [2]法国里尔科技大学,法国里尔59650 [3]国家电力公司成都勘测设计研究院,成都610072

出　　处：《岩土力学》2005年第5期693-698,共6页Rock and Soil Mechanics

基　　金：国家重点基础研究发展规划973项目(No.2002CB412707);国家自然科学基金项目(No.50128908)联合资助课题。

摘　　要：首先,基于在岩石全自动流变伺服仪上得到的绿片岩三轴流变试验曲线,采用五元件线性粘弹性模型对表现为粘弹性流变特性的曲线进行了辨识,获得了绿片岩的粘弹性流变参数;然后,提出了一个新的非线性粘性元件,并将其与塑性体并联起来,得到一个新的非线性粘塑性体(NVPB),该体能充分反映岩石的加速流变特性:同时,将NVPB模型与五元件粘弹性模型串联起来,建立了一个新的岩石七元件非线性粘弹塑性流变模型。采用绿片岩加速流变全过程曲线,对提出的岩石七元件非线性粘弹塑性流变模型进行了辨识,得到了岩石七元件非线性粘弹塑性流变模型的材料参数。流变模型与试验结果的比较,显示了所建模型的正确性与合理性。Firstly based on the triaxial rheological curves of greenschist specimen on rock servo-controlling rheology equipment, five-component viscoelastic model is put forward to identify the curves that show the viscoelastic rheological properties, which gets the viscoelastic rheological parameters of greenschist. Then a new nonlinear viscous component is put forward. When nonlinear viscous component is parallel connected with the plastic component, a new nonlinear viscoplastic body (NVPB) can be gotten, which may reflect the accelerative rheological properties of rock. At the same time, by connecting NVPB model and five-component viscoelastic model in series, we can construct a new seven-component nonlinear viscoelastoplastic rheological model of rock. Then using complete accelerative rheological curve, proposed seven-component nonlinear viscoelastoplastic rheological model of rock is carried out the identification. The correlative parameters of nonlinear rheological model such as viscoelastic modulus and viscosity etc. are also gained. The comparison between the rheological model and experimental result shows that the nonlinear rheological model is right and reasonable.

关 键 词：岩石力学 绿片岩 三轴流变 非线性粘塑性体(NVPB) 流变指数 七元件非线性粘弹塑性流变模型 

分 类 号：TU458.3[建筑科学—岩土工程]