Experimental study on the influence of earthquake sequences on the conditions of sand liquefaction sites
The research on the liquefaction and reliquefaction trend of sand under the action of earthquake sequence is of great significance for the evaluation of seismic and geological disasters at engineering sites.Through the shaking table test,the changes in site conditions after multiple liquefaction under the action of a simulated earthquake sequence are analyzed.Based on the data collected and recorded by various sensors during the test,combined with the light dynamic penetration test and the geotechnical test data before and after liquefaction,the variation laws of pore water pressure,earth pressure,acceleration,soil moisture content,and relative compactness of soil in the process of site model soil liquefaction are obtained.The results show that under the action in simulated earthquake sequence,with the increase of vibration times,the sand compactness at the same depth increases significantly,the increment decreases gradually,and the pore water pressure increment decreases gradually.However,the sand compactness and pore water pressure increment at different depths gradually decreased from deep to shallow,resulting in the liquefaction potential of deep sand being significantly lower than that of shallow sand.
earthquake sequencesand liquefactioncompactnesspore water pressurelight dynamic penetration test
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