Predicting method on settlement of soft subgrade soil caused by traffic loading involving principal stress rotation and loading frequency

2022 ◽  
Vol 152 ◽  
pp. 107023
Author(s):  
Tingyu Wu ◽  
Hongxu Jin ◽  
Lin Guo ◽  
Honglei Sun ◽  
Junhao Tong ◽  
...  
Keyword(s):  
Principal Stress ◽  
Loading Frequency ◽  
Principal Stress Rotation ◽  
Traffic Loading ◽  
Stress Rotation ◽  
Subgrade Soil ◽  
Soft Subgrade

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.

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