scholarly journals Deformation Behavior of Saturated Soft Clay under Cyclic Loading with Principal Stress Rotation

2021 ◽  
Vol 11 (19) ◽  
pp. 8987
Author(s):  
Zunan Fu ◽  
Guoshuai Wang ◽  
Wenbo Song ◽  
Yanming Yu ◽  
Pengfei Wei ◽  
...  
Keyword(s):  
Pore Pressure ◽  
Principal Stress ◽  
Principal Stress Rotation ◽  
Backbone Curve ◽  
Traffic Loading ◽  
Predictive Values ◽  
Soft Clays ◽  
Stress Rotation ◽  
Deformation Properties

Under long-term traffic loading, the soil elements in subgrade are subjected to continuous principal stress rotation. In order to study the deformation properties of soft clays under traffic loading with principal stress rotation, a series of cyclic torsional shear tests were conducted on Wenzhou soft clays under different torsional cyclic stress ratios and degrees of principal stress rotation. The test results showed the stiffness softening of soil under long-term traffic loading. In addition, the principal stress rotation induced by traffic loading aggravated the deformation of clay samples and pore pressure accumulation. A modified dynamic pore pressure model was applied to consider the effect of principal stress rotation on undrained cumulative pore pressure, predicting the growth of cumulative pore pressure at different cycles. Considering loading cycles and the principal stress rotation, a modified Hardin–Drnevich (H-D) backbone curve model under traffic loading with principal stress rotation was proposed, and the predictive values of this model agreed well with the experimental values. Compared with the traditional H–D model, this model better reflects the cyclic deformation of soft clays under long-term traffic loading with principal stress rotation.

scholarly journals Influence of Intermediate Principal Stress on Undrained Behavior of Intact Clay under Pure Principal Stress Rotation

2013 ◽  
Vol 2013 ◽  
pp. 1-10 ◽  
Author(s):  
Jian Zhou ◽  
Jiajia Yan ◽  
Changjie Xu ◽  
Xiaonan Gong
Keyword(s):  
Pore Pressure ◽  
Principal Stress ◽  
Pore Water ◽  
Pore Water Pressure ◽  
Water Pressure ◽  
Soft Clay ◽  
Shear Stiffness ◽  
Intermediate Principal Stress ◽  
Principal Stress Rotation ◽  
Stress Rotation

This study presents the accumulations of the excess pore water pressure and the deformation as well as the noncoaxial behavior of intact soft clay subjected to pure principal stress rotation. Series of tests were carried out by using a dynamic hollow cylinder apparatus to highlight the influence of intermediate principal stress parameterb. It was found that the rate of PWP evolution was greatly influenced byb, but the influence was not monotonous. Specimens under the conditionb= 0.75 had the highest accumulation of pore water pressure while under the conditionb= 0 had the strongest resistance to the pore pressure generation. PWP accumulated mainly in the first cycle. The failure of specimens under principal stress rotation was controlled by the strain other than the pore pressure. The shear stiffness decreased more quickly with higherbvalue. The direction of the principal strain increment was strongly dependent on the principal stress increment orientation and less influenced by thebvalue and the number of cycles.

Explicit Model for Cumulative Pore Pressure of Saturated Soft Clay

2012 ◽  
Vol 256-259 ◽  
pp. 267-270 ◽  
Author(s):  
Zhao Ming Yao ◽  
Jun Hao Chen
Keyword(s):  
Shear Stress ◽  
Pore Pressure ◽  
Principal Stress ◽  
Axial Stress ◽  
Soft Clay ◽  
Explicit Model ◽  
Traffic Loading ◽  
Cyclic Shear ◽  
Stress Rotation ◽  
Axial Cyclic Loading

The principal stress axial would cyclic rotate when the moving pressure passed. In order to analyze long-term settlement of the ground subjected to traffic loading, the simplified method based on explicit model for predicting the accumulative deformations is usually preferred. The traditional model could not reflect the phenomenon of principal stress rotation. After the axial stress controlled equation and circumferential shear stress controlled equation were derived, A series of consolidated undrained cyclic shear tests were performed under the condition that the general shear stress value was constant and the principal stress angle was rotating. The explicit pore pressure model reference was verified to calculate the accumulative pore pressure caused by the principal stress axial cyclic loading.

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