Shaking table tests aiming at the analysis of the effects of vertical load on lateral displacement of pile group foundation with high-cap in liquefiable soil
Large-scale shaking table model tests on a group of piles with elevated caps were used to simulate the vibration response of pile group foundations under seismic action.Excess pore pressure ratio(pore pressure ratio for short),acceleration,and founda-tion soil displacement were used to study the effects of vertical load on the lateral displacement of pile foundations in saturated sand soil liquefaction sites.The findings indicate that the near-pile region is most significantly impacted by the pile foundation's vertical load.Specifically,the pore pressure ratio decreases as the vertical load increases.The shallow acceleration of the foundation soil and the difference in pore pressure ratios between the superstates on either side of the pile foundation are the primary causes of the pile foundation's lateral displacement.Moreover,the acceleration output of the table surface is mostly amplified by the foundation soil,and the acceleration amplification coefficient falls noticeably as the vertical load increases.The lateral flow and considerable deforma-tion of foundation soil brought on by ground vibration has a major impact on the lateral movement of the pile foundation under the same input and vertical load conditions.Under the condition of a 9%vertical load,the tilt angle of the pile foundation is 4.80°,and the lateral displacement is small.Furthermore,the best overturning resistance can be expected if combining with the liquefaction-resistant ability of the foundation soil.
liquefiable sitespile group foundation with high-capvertical loadpore pressure ratioacceleration amplification fac-torlateral displacement
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