A DUAL-SURFACE DAMAGE MODEL AND EVALUATION FOR NATURAL SOILS WITHIN THE THERMOMECHANICAL FRAMEWORK

作     者：Xuan Guo Chenggang Zhao Dajun Yuan Mengshu Wang 

作者机构：Tunnel and Underground of Engineering Experienmental Research Center Beijing Jiaotong University Beijing 100044 China School of Civil Engineering ＆ Architecture Beijing Jiaotong University Beijing 100044 China 

出 版 物：《Acta Mechanica Solida Sinica》 (固体力学学报（英文版）)

年 卷 期：2008年第21卷第1期

页      面：85-94页

核心收录：

学科分类：08[工学] 0805[工学-材料科学与工程（可授工学、理学学位）] 0802[工学-机械工程] 0701[理学-数学] 0801[工学-力学（可授工学、理学学位）] 080102[工学-固体力学] 0702[理学-物理学] 

基　　金：the Major Research of the National Natural Science Foundation of China(No.90715035) HI-Tech Research and Development Program of China(Code 2007AA11Z132). 

主　　题：dual-surface damage model triaxial tests structured soils thermomechanical approach compressibility 

摘      要：Naturally deposited or residual soils exhibit more complicated behavior than remolded clays. A dual-surface damage model for structured soils is developed based on the thermodynamics framework established in our first paper. The shift stresses and the transformation between the generalized dissipative stress space and actual stress space are established following a systematic procedure. The corresponding constitutive behavior of the proposed model is determined, which reflects the internal structural configuration and damage behavior for geomaterials. Four evolution variables κj^i（i=D, R;j=V, S） and the basic parameters λ, s, v and e0 are introduced to account for the progressive loss of internal structure for natural clays. A series of fully triaxial tests and isotropic compression tests are performed for structured and reconstituted samples of Beijing and Zhengzhou natural clays. The validation of the proposed model is examined by comparing the numerical results with the experimental data.