Effect of Pre-Seismic History on Liquefaction Resistance of Soils Using Shaking Table Tests
Publication: Geo-Congress 2024
ABSTRACT
Liquefaction is a calamitous phenomenon that threatens the safety of infrastructure and buildings constructed in granular deposits during earthquakes. According to the response of different case histories to previous earthquakes, it has been found that the pre-seismic history significantly influences the post-liquefaction behavior of soils. To this end, a shaking table test was conducted to investigate the impact of past earthquakes or aftershocks on the liquefaction potential of saturated sands. A clean sand sample constructed in a laminar box was subjected to multiple seismic events (events A, B, and C). A series of accelerometers, pore water pressure transducer, and linear variable differential transducers (LVDT) were used to analyze the soil behavior during the shakings. The experimental results revealed that with increasing the number of shakings, settlement rate decreases due to an increase in the relative density of soil. Moreover, the excess pore water pressure (EPWP) generated during the shaking reduces as a consequence of previous shakings. Under the condition of no liquefaction, it was noted that the acceleration amplitude increases from the base to the surface of the sample.
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Geo-Congress 2024
Pages: 269 - 276
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Published online: Feb 22, 2024
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