被动桩土压力计算的被动拱-主动楔模型  

PASSIVE ARCHING-ACTIVE WEDGE MODEL OF SOIL PRESSURE CALCULATION IN PASSIVE PILES

作　　者：李忠诚 杨敏[2] 

机构地区：[1]上海申元岩土工程有限公司,上海200011 [2]同济大学地下建筑与工程系,上海200092

出　　处：《岩石力学与工程学报》2006年第z2期4241-4247,共7页Chinese Journal of Rock Mechanics and Engineering

基　　金：上海市科委重点基础研究项目(02DJ14062);高等学校博士学科点专项科研基金资助项目(20020247003)

摘　　要：针对在桥梁码头、工业厂房等工程中经常遇到的被动桩问题,从土体的运动和应力的传递方式入手,采用将被动桩分为被动侧成拱和主动侧形成应变楔分别计算土压力,实现从简单的一维弹性地基梁模型到复杂的三维桩土相互作用的拓展。考虑实际土体的成层性,被动侧土压力的计算考虑土体的成拱效应,传递到桩身上的应力以动态的应变楔向主动侧土体传递,建立桩土相互作用的整体平衡方程,并采用有限差分方法迭代求解。最后采用一工程实例对该模型进行验证。The problem of passive pile is commonly met in bridge,wharf and industrial factory engineering.Based on soil movement and stress transfer approach,soil pressure of passive piles is calculated considering soil arching effect at passive side of pile and active wedge model at active side of pile.In this way one-dimensional model of beam on elastic foundation(BEF) is extended to 3D one considering the complicated interaction between pile and soil.Considering the realistic soil layers,soil arching effect in the passive side of pile and the stress of pile shaft transferring into soil by means of dynamic strain wedge at active side of pile,the global equilibrium equation is established,which is solved by finite difference method.Finally,the practical method is verified by an example from real engineering.

关 键 词：土力学 土拱效应 被动桩 主动楔模型 侧向变形 

分 类 号：TU47[建筑科学—结构工程]