scholarly journals EXPERIMENTAL EVALUATION OF COIR MATS TO ENHANCE THE WEAK SUBGRADE SOIL UNDER REPEATED LOADING CONDITION

2018 ◽  
Vol 8 (1) ◽  
pp. 125-134
Keyword(s):  
Experimental Evaluation ◽  
Loading Condition ◽  
Repeated Loading ◽  
Subgrade Soil

scholarly journals Experimental evaluation of geocell-reinforced bases under repeated loading

2018 ◽  
Vol 11 (2) ◽  
pp. 114-127 ◽  
Author(s):  
Sanat K. Pokharel ◽  
Jie Han ◽  
Dov Leshchinsky ◽  
Robert L. Parsons
Keyword(s):  
Experimental Evaluation ◽  
Repeated Loading ◽  
Reinforced Bases

Correlation between Resilient Modulus and Plastic Deformation for Cohesive Subgrade Soil under Repeated Loading

2008 ◽  
Vol 2053 (1) ◽  
pp. 72-79 ◽  
Author(s):  
Shu-Rong Yang ◽  
Wei-Hsing Huang ◽  
Chi-Chou Liao
Keyword(s):  
Plastic Deformation ◽  
Plastic Strain ◽  
Strain Hardening ◽  
Resilient Modulus ◽  
Cohesive Soil ◽  
Repeated Loading ◽  
Hardening Behavior ◽  
Subgrade Soil ◽  
Stress Levels ◽  
Strain Hardening Behavior

Pavement performance is related to resilient modulus and plastic deformation of pavement materials, which in turn are affected by environmental conditions and traffic loading. A series of triaxial tests was conducted on a residual lateritic soil for 10,000 load repetitions, with some specimens subjected to 100,000 load repetitions, to characterize the behavior of cohesive subgrades under repeated loading, including resilient modulus and plastic deformation. The shakedown concept was used to describe the accumulated plastic deformation and the strain-hardening and softening behavior. Experimental results show that the resilient modulus of cohesive subgrades exhibits strain-hardening behavior under low stress levels. In the meantime, the rate of plastic strain accumulation becomes diminutive. Soil under this condition is in a stable state. Conversely, under high stress levels, cohesive soil tends to soften after a specific number of load applications and accumulates excessive plastic strain and leads to an unstable state. To predict the plastic strain of subgrade soil under repetitive loading, regression models incorporating the strain-hardening behavior for a cohesive soil were used.

Shakedown of Subgrade Soil under Repeated Loading

1996 ◽  
Vol 1547 (1) ◽  
pp. 82-88 ◽  
Author(s):  
Boris S. Radovsky ◽  
Natalie V. Murashina
Keyword(s):  
Half Space ◽  
Contact Pressure ◽  
Soil Compaction ◽  
Mechanistic Model ◽  
Pavement Design ◽  
Repeated Loading ◽  
Normal Stresses ◽  
Design Problems ◽  
Subgrade Soil ◽  
Coulomb Failure Criterion

A new model for predicting the performance of a subgrade during soil compaction by rollers as a function of contact pressure and the strength characteristics of soils was developed. The model can be used to develop improved methods of pavement design, considering that the accumulation of plastic strains may continue under additional load repetitions or may cease to increase with time, indicating adaptation or shakedown conditions. To develop the mechanistic model of a subgrade, the homogeneous semi-infinite elastoplastic half-space under repeated loading was considered. By using a Mohr-Coulomb failure criterion, the boundary loads for which shakedown conditions or the steady state will be attained were determined. The residual horizontal normal stresses in the half-space were calculated and were shown to be in agreement with the measured distribution with depth. The theoretical and experimental results as they apply to soil compaction and pavement design problems are discussed. The required compaction contact pressure and the thickness of the compacted zone are estimated. The structural pavement design approach, considering residual normal stresses in a subgrade, is presented.

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