(1. School of Civil Engineering，Southeast University，Nanjing，Jiangsu 210096，China；2. Key Laboratory of Concrete and Prestressed Concrete Structures of Ministry of Education，Southeast University，Nanjing，Jiangsu 210096，China；3. CCCC Highway Consultants Co.，Ltd.，Beijing 100010，China)
Abstract：This paper aims at analyzing the passive mechanical characteristics of axially loaded isolation piles under large-scale surcharge loading. Firstly，the formulation for calculating lateral additional pressure with local surcharge is deduced based on the solution of improved Boussinesq. Then according to soil movement and stress transfer approach，the rational passive load distribution of isolation piles is obtained by improving local deformation theory of plasticity considering soil arching. Finally，differential equations of elastic and plastic regions of isolated piles are established by considering the gravity second-order effect caused by lateral load and yield of soil for tri-parameter Winkler elastic foundation beam model. Combining matrix transfer method with Laplace forward and inverse transformation，the numerical solution of passive mechanical features of isolation piles is obtained. Later，the proposed approach is verified by the test data. The results indicate that the numerical and measured results are in good agreement，and the proposed approach is applicable in engineering practice.
DE BEER E. The effects of horizontal loads on piles，due to surcharge or seismic effects[C]// Proceedings of the Specialty Session 10. Tokyo，Japan：Japanese Association for Steel Pipe Piles，1977：1-14.
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2014, Vol. 33 
