Numerical Investigation on Dynamic Response of Liquefiable Soils Around Permeable Pile Under Seismic Loading

Abstract

AbstractPermeable piles have been widely adopted as a new anti-liquefaction treatment measure in the liquefiable site. The dynamic numerical analysis to study the anti-liquefaction effects of liquefiable soils around the permeable pile under the seismic wave was carried out to estimate the excess pore water pressure ratio (EPWPR), pile settlement, and the soil settlement. Numerical results show that the EPWPR has exceeded the critical level of liquefaction at 2 m far from the pile at the top surface of the liquefiable soil layer. The drainage effect of the soil around the pile weakens as the depth of the soil layer increases, that is, the shear stress and strain are being strong rapidly. Additionally, the effect of pile permeability on dynamic responses of liquefiable soil indicates that the increase of pile permeability will considerably weaken dynamic responses. Furthermore, the failure of liquefaction never takes place in the site if the permeability ratio of the pile to that of soil exceeds the critical value of 10.KeywordsSeismic responseLiquefiable soilPermeable pile