淤泥质软粘土剪切蠕变方程及流变参数研究  

Research on Shear Creep Equation and Rheological Parameters of Sludge Soft Clay

作　　者：郑传峰[1] 王磊[1] 焦晓磊[2] 

机构地区：[1]吉林大学建设工程学院,吉林长春130026 [2]天津市公路局,天津300211

出　　处：《建筑科学与工程学报》2011年第3期101-105,共5页Journal of Architecture and Civil Engineering

基　　金：吉林省科技发展计划项目(20070545)

摘　　要：基于淤泥质软粘土粘弹塑性力学性质,利用粘壶元件、弹簧元件及滑块元件分别表征牛顿流动体、虎克弹性体及塑性体,将这3类基本元件通过串联和并联的方式组合成软粘土力学模型,根据虎克定律及牛顿内摩擦定律等推导出软粘土本构方程;通过Laplace变换和Laplace反变换及单位阶梯函数推导出软粘土蠕变方程,采用线性回归确定蠕变方程参数;假定动载为正弦变化剪切力,基于淤泥质软粘土本构方程进一步推导出动载条件下的流变参数。结果表明:所建理论模型力学关系明确,通过推导出的剪切蠕变方程及确定的蠕变参数,可以预估动载条件下该类土的流变特性。Viscosity kettle components, spring components and slippage components were used to denote Newton liquid substance, Hook elastic substance and plastic substance of sludge soft clay according to viscoelasto-plastic mechanical properties. These three basic components were combined into a mechanical model of soft clay through the series and parallel combinations. Constitutive equations were derived by Hook law and Newton inner friction law and so on. Creep equations were deduced by Laplace transform and Laplace inverse transform as well as unit step function. The creep equation parameter was confirmed by adopting linear regression. The dynamic loads were assumed as sine wave shear force, and rheological parameters under the dynamic loads were got based on constitutive equation of sludge soft clay. The results show that mechanics relation of theoretical model is definite, rheological characteristics under dynamic loads can be estimated by shear creep equation and definite of creep parameters.

关 键 词：淤泥质软粘土 本构方程 蠕变方程 线性回归 动载 流变参数 

分 类 号：TU411.3[建筑科学—岩土工程]