Laboratory testing and analysis of dynamic and static resilient modulus of subgrade soil under various influencing factors

2019 ◽  
Vol 195 ◽  
pp. 178-186 ◽  
Author(s):  
Xiaolan Liu ◽  
Xianmin Zhang ◽  
Hao Wang ◽  
Baiyu Jiang
Keyword(s):  
Influencing Factors ◽  
Laboratory Testing ◽  
Resilient Modulus ◽  
Subgrade Soil

Evaluation of Resilient Modulus Test Protocols for New Mexico Subgrade Soil

2013 ◽  
Vol 742 ◽  
pp. 109-115 ◽  
Author(s):  
Md Tahmidur Rahman ◽  
Anthony S. Cabrera ◽  
A. Tarefder Rafiqul
Keyword(s):  
New Mexico ◽  
Laboratory Testing ◽  
Resilient Modulus ◽  
Measurement Methods ◽  
Subgrade Soils ◽  
Subgrade Soil ◽  
Design Guide ◽  
Internal Deformation ◽  
Testing Protocols ◽  
Important Design

Resilient modulus (MR) is a laboratory determined parameter of pavement subgrade soil which is an important design input for the Mechanistic Empirical Pavement Design Guide (MEPDG). There are two accepted laboratory testing protocols for determining MR, namely AASHTO T307 and NCHRP 1-28A. AASHTO method is more popular because of its simplicity in positioning the load and deformation transducers. This study is undertaken to examine the available test protocols for New Mexico subgrade soil by varying the location of deformation transducers and effects of sample size. AASHTO A-6 subgrade soils have been collected from the state of New Mexico, USA. Specimens of 2.8 inch and 4 inch diameters are reconstituted using modified proctor compaction.Resilient modulus values aredetermined using external and internal deformation techniques. Comparative analyses are performed and amount of extraneous large deformation (lower MR) measured by the AASHTO recommended external deformation transducers is measured.In addition, appropriate internal deformation measurement methods are recommended to obtain most consistent MR values. 2.8 inch and 4 inch diameter sample generate almost similar MR values.

Resilient Modulus of Lime-Bamboo Ash Stabilized Subgrade Soil with Different Compactive Energy

2019 ◽  
Vol 37 (4) ◽  
pp. 3557-3565 ◽  
Author(s):  
Chijioke Christopher Ikeagwuani ◽  
Donald Chimobi Nwonu
Keyword(s):  
Resilient Modulus ◽  
Subgrade Soil

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.

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