THE EFFECT OF INTERACTION ON PILE-RAFT SYSTEM SETTLEMENT SUBJECTED TO EARTHQUAKE EXCITATION

Piled raft is a geotechnical composite structure consists of three elements:piles, raft, and soil. It is, usually, utilized as a foundation for tall building.During earthquakes, a soil-pile, soil-raft, and pile-raft elements aresubjected to a complex system of stresses. Stress–strain behavior of soil is,usually, hysteric and non-linear. The problem is further compounded by theinteraction of stress waves and soil and piles. Due to significant increasingin seismic activity in world during the last decades especially in Middle Eastreign, the response of piled raft system needs more attention. This paperaims to study interaction of sandy soils with piled raft and detecting itseffects on settlement using numerical analysis by finite element method.PLAXIS 3D package was used as a finite element simulator. The resultsindicated that there is minor differences in settlement with rigid interfacecase (R=1) in comparison to the other interface cases (R=0.1-0.9). Inaddition, the settlement of piled raft, slightly, varies with the size andstrength of their interface elements (adhesion and wall friction) to the soilstrength (cohesion and friction angle).

کلیدواژه ها:

Piled raft ، Interaction ، Earthquake response ، PLAXIS 3D ، Embedded pile