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- Title
The dynamic behavior of calcareous sand under actual seismic loading.
- Authors
Wang, Hai-Ping; Gao, Meng; Wang, Ying; Chen, Qing-Sheng
- Abstract
Seismic liquefaction of sand is an important research topic in geotechnical engineering. Most of the previous researchers have simulated liquefaction process under earthquake by sinusoidal load dynamic test, that is, the actual seismic wave is simplified to equivalent sinusoidal wave through Seed's method of equivalent cycle number. However, it cannot reflect the actual situation of soil seismic performance. To overcome this issue, in this paper, a method for applying the actual seismic wave to test is proposed, which is used for conducting the dynamic triaxial test to study the liquefaction properties of calcareous sand under actual seismic loading. Based on the equivalent cycle number method, the actual seismic waves are equivalent to sinusoidal waves, and the liquefaction properties of calcareous sand under equivalent sinusoidal loads are compared with that of actual earthquake loads. After that, the earthquake performance of calcareous sand under different loading modes is analyzed to obtain the equivalent reduction coefficient conforming to calcareous sand. The results demonstrate that the pore water pressure development of calcareous sand under actual seismic loading has the characteristic of "stepped." The strain failure type is a tensile failure, and there is a threshold cyclic stress ratio of liquefaction failure. Compared with the actual seismic load, the pore water pressure and strain accumulation of calcareous sand under sinusoidal load have more regular shapes. When studying the dynamic liquefaction properties of calcareous sand, the pore water pressure failure criterion is preferred for actual seismic load, while the strain failure criterion is preferred for the sinusoidal load. The equivalent reduction coefficient of calcareous sand under seismic loading is slightly less than 65%, and it is supposed to be selected according to different loading periods.
- Publication
Arabian Journal of Geosciences, 2022, Vol 15, Issue 10, p1
- ISSN
1866-7511
- Publication type
Article
- DOI
10.1007/s12517-022-10284-2