Location
St. Louis, Missouri
Presentation Date
27 Apr 1981, 2:00 pm - 5:00 pm
Abstract
Stress-controlled cyclic triaxial tests were performed on clay samples obtained from the subgrades of existing highway pavements in the State of Michigan. These samples were unconsolidated or isotropically consolidated and then tested under the following conditions: 1) confining pressures of 34.5 psi and 172.4 kPa (5 and 25 psi), 2) a range of stress ratio from 2 to 4, 3) a constant frequency of one cycle per second, and 4) at the natural water contents. Test equipment included an MTS electrohydraulic closed-1oop system which applies the sustained and cyclic loads to the sample in a stress-controlled mode, a minicomputer which controls the actuator of the MTS system to yield a loading function similar to that applied, by tandem axle truck, to the pavement section, and measuring devices including two vertical and two radial LVDT(s), a load cell, a pore water pressure transducer, recording devices and an ascilloscope. The test results indicate that, for all samples, the plastic strain rate (in the logarithmic mode) assumes two values per test. The first of these values is constant from cycle number one to cycle number 100 while the second value is also constant and it controls the plastic strain beyond cycle number 100. This abrupt change in the strain rate values was observed in the unconsolidated and consolidated samples. Also, it was found that the ultimate stress ratio that it can be applied on the sample during cyclic loading is a function of the confining pressures and other sample parameters.
Department(s)
Civil, Architectural and Environmental Engineering
Meeting Name
1st International Conference on Recent Advances in Geotechnical Earthquake Engineering and Soil Dynamics
Publisher
University of Missouri--Rolla
Document Version
Final Version
Rights
© 1981 University of Missouri--Rolla, All rights reserved.
Creative Commons Licensing
This work is licensed under a Creative Commons Attribution-Noncommercial-No Derivative Works 4.0 License.
Document Type
Article - Conference proceedings
File Type
text
Language
English
Recommended Citation
Goltom, T. and Baladi, G., "Soil Behavior Under Dynamic Loadings" (1981). International Conferences on Recent Advances in Geotechnical Earthquake Engineering and Soil Dynamics. 14.
https://scholarsmine.mst.edu/icrageesd/01icrageesd/session01b/14
Included in
Soil Behavior Under Dynamic Loadings
St. Louis, Missouri
Stress-controlled cyclic triaxial tests were performed on clay samples obtained from the subgrades of existing highway pavements in the State of Michigan. These samples were unconsolidated or isotropically consolidated and then tested under the following conditions: 1) confining pressures of 34.5 psi and 172.4 kPa (5 and 25 psi), 2) a range of stress ratio from 2 to 4, 3) a constant frequency of one cycle per second, and 4) at the natural water contents. Test equipment included an MTS electrohydraulic closed-1oop system which applies the sustained and cyclic loads to the sample in a stress-controlled mode, a minicomputer which controls the actuator of the MTS system to yield a loading function similar to that applied, by tandem axle truck, to the pavement section, and measuring devices including two vertical and two radial LVDT(s), a load cell, a pore water pressure transducer, recording devices and an ascilloscope. The test results indicate that, for all samples, the plastic strain rate (in the logarithmic mode) assumes two values per test. The first of these values is constant from cycle number one to cycle number 100 while the second value is also constant and it controls the plastic strain beyond cycle number 100. This abrupt change in the strain rate values was observed in the unconsolidated and consolidated samples. Also, it was found that the ultimate stress ratio that it can be applied on the sample during cyclic loading is a function of the confining pressures and other sample parameters.
