TEST INVESTIGATION ON DISTRIBUTION OF INTERNAL FORCES IN PILE GROUPS UNDER DIFFERENT LATERAL ECCENTRICITIES
(1. Institute of Geotechnical Engineering，Zhejiang University，Hangzhou，Zhejiang 310058，China；2. Key Laboratory of Soft Soils and Geoenvironmental Engineering，Ministry of Education，Zhejiang University，Hangzhou，Zhejiang 310058，China)
Abstract：Two large-scale model tests on 3×3 pile groups under lateral loading with different eccentricities(e = 6D and e = 11D，D is pile diameter) in saturated silt are conducted to investigate the law that the applied loads are transferred in the pile groups. The load-displacement curves of the pile groups indicated that an applied torque significantly decreases the lateral resistance of the pile groups. Both lateral and torsional resistances of the individual pile were simultaneously mobilized to resist the applied load. It is found that the lateral and torsional resistances，and in turn，the bending moments，of the individual pile are significantly different；and the difference becomes larger as the eccentricity increases. Both torsional and lateral resistances of the individual pile contribute to resist the applied torque；and the contribution of torsional resistances of the individual pile to the applied torque significantly decreases with the increase in applied load.
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2011, Vol. 30 
