考虑桩土侧移的被动桩中土拱效应数值分析

被动桩对侧向位移的土层起到遮拦作用的机制主要是土拱效应。采用土工有限元软件Plaxis Tunnel 3D 1.2，对堆载荷载作用下邻近桩基中的土拱效应产生机制和性状进行三维数值分析，指出目前被动桩中土拱效应二维有限元分析存在的问题。考虑桩土侧移与相对位移，再利用土工有限元软件Plaxis2D 8.2详细地研究了侧向土体位移大小、桩身水平位移大小、土体性质以及桩土接触面性质等影响因素对土拱效应性态和桩土荷载分担比的影响。

Numerical analysis of soil arching effects in displaced passive piles considering lateral soil movements

The mechanism of passive piles to keep out the soil layers that move laterally is mainly the soil arching effect between piles;this effect is a phenomenon to transfer stresses from a yielding mass onto the adjacent stationary part of the soils.The geotechnial analysis software package named Plaxis tunnel 3D1.2 is used to study the mechanism and behavior of soil arching effects in passive piles due to surcharge loads using three dimensional finite element method.Limitations of two-dimensional finite element analysis used by former researchers for soil arching effect are discussed in brief.Taking into account of the effect of passive pile displacement,the geotechnical two-dimensional finite element software Plaxis 8.2 is used to study the behavior of soil arching effect.And the effects of different factors on soil arching effect and the ratio of loads on piles to that on soils are depicted,such as soil properties,piles spacing ratio,passive pile displacement,and the interface behaviors between pile and soils.