Duncan-chang Model Parameters And Shear Strength Parameters Of The Optimization Study

On the basis of analyzing the study actuality of soil constitutive model and modern optimization arithmetic in the rock and soil engineering, aim at the confirming problem of constitutive model parameters and the application problem of seeking constitutive model parameters by the optimization theory, through the the optimization theory and soil test methods, the model parameters of Duncan-Chang E-v and E-K model and the shear strength parameters of soil are studied for providing proof of seeking constitutive model parameters and the shear strength parameters by the optimization theory.Introducing the optimization theory, the optimization target function is established by the controlling the error of calculating curve and experimentation curve which is controlled by the volumetric strain. Optimization parameters of the Duncan-Chang model are searched by the fmincon optimization function and GA tool.The contrast results indicate:modern optimization methods outbalances traditional optimization methods; model parameters which are confirmed by the optimization methods outbalances model parameters which are confirmed by the experimentation methods.Based on the optimization study of Duncan-Chang model parameters,though soil test methods, the optimization target function of shear strength parameters is also established by the controlling the error of calculating curve and experimentation curve which is controlled by the shear pressure. Shear strength optimization parameters of soil are searched by GA tool using GA arithmetic. Optimization results indicate:there is error between relation curve and experimentation curve for Duncan-Chang E - K model parameters ranges is selected as ranges of shear strength parameters, but the variety trend between optimization shear strength parameters and experimentation shear strength parameters is consistent to the experimentation curve.The traditional parameters and optimization parameters sensitivity of E-K model is analysed for the appraising the stability of optimization parameters.The sensitivity results indicate: traditional model parameters are sensitive than optimization model parameters,so the results which is arosed by the traditional model parameters are bigger than the results which is arosed by the optimization model parameters.The the optimization model parameters make the calculation results more stability.In general,It is effective that optimization theory is introduced to the optimization study of model parameters and the shear strength parameters of soil.