Regression models for validating cyclic triaxial test results Free chat with telugu women without registration
In early stage, some investigations based on repeated load triaxial tests found that, to a certain physical condition, the permanent axial strain clearly increased with increasing cyclic stress and decreasing confining pressure .
In this sense, it is principally some forms of stress ratio that governed the permanent deformation behavior in the tests, and more research attention was paid to the deformation prediction model based on that stress ratio.
As the initial stress ratio was less than the slope of static failure line, the experimental results indicated that the increase of initial mean stress enhanced the capability of resisting deformation.
A simplified mechanistic empirical prediction model was proposed, which predicted the permanent deformation as product of four independent functions about cyclic stress amplitude, initial mean stress, initial stress ratio, and number of load cycles.
Over the years, considerable investigations have been devoted to characterizing the resilient behavior of soils using laboratory techniques, and lots of mathematical models have been developed to predict resilient response considering the effects of stress levels, void ratio, and some other factors [5–8].
For instance, in view of the material nonlinearity, Seed  introduced the concept of resilient modulus first, which was defined as the ratio of cyclic stress level to recoverable axial strain, and some similar definitions were widely used by later researchers.
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Soil big specimens of around 180 mm diameter (with length to diameter aspect ratio of 2:1) were prepared according to the standard procedure described by AASHTO T 307 and then were subjected to repeated load triaxial tests.The research presented by this paper was financially supported by the University of Wisconsin-Madison Department of Civil and Environmental Engineering through a Fulbright grant of the United States Department of States.The authors would like to acknowledge the Geo-Engineering and Geological Engineering Program Research Team and the Fulbright Team in Washington DC for their guidance and valuable input in this research project.Static loads as unconfined compression test (UCT) remain the only engineering approach used.Alternative testing techniques can be chosen as supplementary tests for characterizing pavement materials.
The most possible reason is that the deformation accumulation under repeated loading is a time-consuming process affected by too many factors, and the obtained test results are much more scattered than resilient modulus tests [10, 11].