桩基侧阻力快速确定方法讨论  

A Quick Determination Method for Side Resistance of Pile

作　　者：穆锐 郭建强 黄质宏 MU Rui;GUO Jian-qiang;HUANG Zhi-hong(College of Civil Engineering,Guizhou University,Guiyang550025,China)

机构地区：[1]贵州大学土木工程学院

出　　处：《长江科学院院报》2019年第11期115-119,共5页Journal of Changjiang River Scientific Research Institute

基　　金：贵州省土木工程一流学科建设项目(QYNYL[2017]0013)

摘　　要：桩土(岩)耦合机理是一个非常复杂的力学问题。通过将桩土(岩)复合体看作由不同刚度地质材料组成的层状体,由桩土(岩)界面变形协调条件(界面分离瞬间,土(岩)、桩变形相差n倍),基于连续介质理论建立了快速确定桩基侧阻力的模型。研究结果显示:①桩基侧阻力随土(岩)、桩弹性模量比值Es/Ep增大而提高,且Es/Ep越大,侧阻力变化越明显;②挤土效应越明显,侧阻力降低越明显;③采用快速确定桩基侧阻力模型对工程试桩试验数据进行验证,结果表明,利用该模型对类似场地桩基的侧阻力进行预测是可行的、有效的。The stress and deformation of pile-earth/rock coupling system is a complex mechanics issue.In this paper,a model for the quick determination of pile’s side resistance is established based on continuous medium theory according to the deformation coordination condition(the deformations of soil/rock and pile differ by n times at the moment of separation between soil/rock and pile).The pile-soil/rock complex is considered as a layered material composing geologic materials with different stiffness.The research findings are as follows:(1)The side resistance of pile is manly affected by E s/E p the ratio of soil/rock’s elastic modulus to pile’s elastic modulus;the greater E s/E p is,the more remarkable side resistance changes.(2)Side resistance of pile declines when the soil squeezing effect gets more evident.(3)The test dafa of the engineering test piles are verified by the rapid determination model for pile foundation’s side resistance.The results show that it is feasible and effective to use the model to predict the lateral resistance of similar pile foundations.

关 键 词：桩基侧阻力 连续介质理论 桩土(岩)界面 变形协调条件 挤土效应 

分 类 号：TU473.1[建筑科学—结构工程]