期刊
COLD REGIONS SCIENCE AND TECHNOLOGY
卷 157, 期 -, 页码 139-148出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.coldregions.2018.10.003
关键词
Freeze-thaw cycles; Empirical equations; Dynamic behavior; Granular base course materials; China's high-speed railway
资金
- National Major Scientific Instruments Development Project of China [41627801]
- National Natural Science Foundation of China [41430634, 41731288]
- State Key Laboratory for GeoMechanics and Deep Underground Engineering [SKLGDUEK1209]
- State Key Laboratory of Permafrost Engineering of China [SKLFSE201509]
With the rapid development of high-speed railways (HSRs) in seasonally frozen regions in China in recent years, there is an increasing need for better understanding of how the construction materials behave. In particular, the dynamic behavior of granular base course materials used for China's HSRs subjected to combined actions of cyclic loading and freeze-thaw (F-T) cycles has attracted much attention. In this study, a series of cyclic triaxial tests were performed to investigate the characteristics of granular base course materials. A number of factors including effect of F-T cycles were considered in these tests. As such, representative test results of dynamic shear stress amplitude ((tau) over bar (d)), dynamic shear modulus (G(d)), and damping ratio (lambda) are presented and discussed. Based on the Hardin-Drnevich model, a fitting equation for determining maximum dynamic shear modulus (G(d,max)) is proposed. Then, a unified normalized dynamic shear modulus (G(d)/G(d,max)) curve is drawn and well validated by the test results. Furthermore, equations for lambda are expressed in terms of an exponential function of G(d)/G(d,max) The test results show that the G(d)/G(d,max) curves are not completely consistent with previous studies. Overall, this study provides further insights into the dynamic behavior of granular base course materials subjected to F-T cycles.
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