Abstract
Due to the different material composition and deposition conditions, the undisturbed clay presents different degree of structure. Because of the existence of structure, the undisturbed clay has structural yield stress. When the stress level exceeds the structural yield stress, the stress-strain relation of undisturbed clay has typical softening characteristics. To explore the constitutive relation of undisturbed soil, triaxial consolidation, and drainage tests were carried out on undisturbed and remolded soils of structural clay in Zhanjiang Formation in China, and the stress-strain relations under different confining pressures were obtained. By analyzing the structural failure process of undisturbed clay, Weibull distribution was introduced to describe the strength distribution of each point in undisturbed clay, and the structural failure coefficient of undisturbed clay was established during the loading process. Based on the elastic theory and structural failure coefficient, a constitutive model considering the structural failure of clay was proposed, and the method to determine the model parameters was given. The model was used to simulate the experimental data in this paper and the reference, and the validity of the model was verified. The results show that the model can well simulate the softening effect of structural clay during loading.
Highlights
Since Roscoe et al (1958; 1963; 1968) proposed the Cam-clay model, the constitutive theory of remolded soil has entered a new stage of development, and relatively satisfactory results have been achieved in the study of the constitutive relation of remolded soil
Where: Sc and Sφ are the structural coefficients of the soil, and the smaller the values of Sc and Sφ are, the stronger the structure of the soil is, and vice versa. cr is the cohesion corresponding to residual strength. cp is the cohesion corresponding to the peak strength. φr is the internal friction Angle corresponding to the residual strength. φp is the internal friction Angle corresponding to the peak strength
The stress-strain relation curves of the undisturbed and remolded soils of the structural clay of Zhanjiang Formation are obtained through triaxial tests
Summary
College of Civil Engineering and Architecture, Guilin University of Technology, Guilin, China. Due to the different material composition and deposition conditions, the undisturbed clay presents different degree of structure. Because of the existence of structure, the undisturbed clay has structural yield stress. When the stress level exceeds the structural yield stress, the stress-strain relation of undisturbed clay has typical softening characteristics. To explore the constitutive relation of undisturbed soil, triaxial consolidation, and drainage tests were carried out on undisturbed and remolded soils of structural clay in Zhanjiang Formation in China, and the stress-strain relations under different confining pressures were obtained. Based on the elastic theory and structural failure coefficient, a constitutive model considering the structural failure of clay was proposed, and the method to determine the model parameters was given. The results show that the model can well simulate the softening effect of structural clay during loading
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