A Constitutive Model of Granite Shear Creep under Moisture  

作　　者：Xingang Wang Bin Hu Huiming Tang Xinli Hu Jiading Wang Lei Huang 

机构地区：[1]State Key Laboratory of Continental Dynamics, Department of Geology, Northwest University [2]Faculty of Engineering, China University of Geosciences

出　　处：《Journal of Earth Science》2016年第4期677-685,共9页地球科学学刊（英文版）

基　　金：supported by the National Natural Science Foundation of China (No. 41172281);the National Basic Research Program of China (No. 2011CB710604);the Opening Foundation of the State Key Laboratory of Continental Dynamics, Northwest University (No. 201210126)

摘　　要：Previous constitutive models of granite shear creep have two limitations：（1） although moisture greatly affects granite shear creep behavior, currently there are no constitutive models that include this factor;（2） there are also no models that include an acceleration stage. This paper presents an improved Burgers constitutive model with the addition of a damage parameter to characterize the moisture effect and uses a nonlinear relation equation between stress and strain for inclusion as the acceleration stage. The damage parameter is determined from granite creep experiment under four different moisture contents（0%, 0.22%, 0.49%, and 0.79%）. The nonlinear relation equation is obtained by fitting a dataset of stain versus time under five different loading stages. To verify the presented model, a creep experiment was conducted on other granite samples and the results show that the model agrees well with the experimental observation data.Previous constitutive models of granite shear creep have two limitations：（1） although moisture greatly affects granite shear creep behavior, currently there are no constitutive models that include this factor;（2） there are also no models that include an acceleration stage. This paper presents an improved Burgers constitutive model with the addition of a damage parameter to characterize the moisture effect and uses a nonlinear relation equation between stress and strain for inclusion as the acceleration stage. The damage parameter is determined from granite creep experiment under four different moisture contents（0%, 0.22%, 0.49%, and 0.79%）. The nonlinear relation equation is obtained by fitting a dataset of stain versus time under five different loading stages. To verify the presented model, a creep experiment was conducted on other granite samples and the results show that the model agrees well with the experimental observation data.

关 键 词：moisture state shear creep constitutive model Burgers model damage variable nonlinear visco-elasto-plastic three-dimensional creep constitutive equation. 

分 类 号：TU45[建筑科学—岩土工程]