Seismic Interaction Characteristics of an Inclined Straight Alternating Pile Group-Soil in Liquefied Ground

Abstract

Inthispaper,thepile-soilinteractionofalow-risepilecapfoundationofaninclinedstraightalternatingpileontwoorthreelayers of a soil liquefaction site under seismic load is studied. By inputting the 0.5g El Centro seismic wave in FLAC3D, the pile-soil interactionruleofthepilefoundationoftheinclinedandstraightpilegroupsofthelow-pilecapunderseismicactionissimulated. Byanalyzingthesoilacceleration,theporepressureratio,thehorizontaldisplacementofthepilebody,theverticaldisplacement, and the pile body bending moment, the law of pile-soil interaction between the pile and soil when the lower part of the pile is embeddedintheclaylayerisstudied,andthelow-risepilecapinclinedstraightalternatinggrouppilefoundationonthetwo-layer soil and the three-layer soil free field is compared and analyzed. The results show that, under seismic load, the maximum acceleration of soil mass in the two-layer soil and three-layer soil model is discrete, and the pore pressure ratio of sand soil increasesfrombottomtotop.Byanalyzingthedisplacementandbendingmomentofpilebody,thebendingmomentatthejoint between the pile cap and the top of pile body is the largest and the most vulnerable to damage. The maximum value of pile displacementandbendingmomentinthethree-layersoilislessthanthemaximumvalueofthetwo-layersoil,indicatingthatthe pile group foundation in the three-layer soil free site model is safer.