Experimental and Numerical Study on Dynamic Response of Underground Structure in Coral Sand Under Earthquakes

ABSTRACTThe seismic performance of the liquefiable coral sand sites with underground structures is unclear. To explore the particular dynamic response of coral sand-underground structure, the shaking table tests in conjunction with numerical calculations were carried out. The soil-structure separation, frequency spectrum variation and seismic fortification of underground structures in coral sand were discussed. The results show that the soil liquefaction increases the energy dissipation of the coral sand-underground structure system. However, attention should be paid to the influence of the coral sand nonlinear development near the groundwater level on the seismic stability of the underground structure during strong earthquakes.KEYWORDS: Shaking tablenumerical simulationcoral sandunderground structureliquefaction AcknowledgmentsThe research was financially supported by the National Natural Science Foundation of China (Grant No. 52178312, 51878103, and 41831282), Innovation Group Science Foundation of the Natural Science Foundation of Chongqing, China (Grant No.cstc2020jcyj-cxttX0003) and Chongqing Talents Program (Grant No. cstc2021ycjh-bgzxm0051).Disclosure StatementNo potential conflict of interest was reported by the author(s).Additional informationFundingThe work was supported by the National Natural Science Foundation of China (Grant No. 52178312, 51878103, and 41831282), Innovation Group Science Fundation of the Natural Science Fundation of Chongqing, China (Grant No. cstc2020jcyj-cxttX0003) and Chongqing Talents Program (Grant No. cstc2021ycjh-bgzxm0051).