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长短桩复合地基中桩荷载传递规律有限元分析

发表时间:2012-01-31  浏览量:1469  下载量:618
全部作者: 杨勇,葛忻声
作者单位: 太原理工大学建筑与土木工程学院
摘 要: 通过由长短桩复合地基处理高层建筑软弱地基的工程实例,利用有限元法分析复合地基中长桩和短桩荷载传递规律。分析结果表明:长桩桩身轴力沿深度先增大后减小,长桩角桩轴力大于边桩轴力大于中桩轴力,长桩角桩最大轴力距桩顶距离小于边桩小于中桩;长桩桩身上部一定范围内出现负摩阻力,随着深度的增加,负摩阻力逐渐减小,直至为零,随后正摩阻力逐渐增大,长桩角桩摩阻力大于边桩摩阻力大于中桩摩阻力;短桩桩身轴力沿深度逐渐减小,短桩桩身轴力沿深度减小速度为先增大后减小;短桩摩阻力沿深度先增大后减小。
关 键 词: 岩土工程;长短桩;有限元;轴力;正摩阻力;负摩阻力
Title: Finite element analysis of pile load transfer behaviors composite foundation with long-short-piles
Author: YANG Yong, GE Xinsheng
Organization: College of Architecture and Civil Engineering, Taiyuan University of Technology
Abstract: A project case of the composite foundation with long-short-piles in liquefied soil under a high-rise building. By using the finite element method, load transfer mechanism of long pile and short pile in composite foundation is analyzed.The results show that axial force of long pile first increases then reduces. Axial force of corner pile of long pile is bigger than edge pile and axial force of edge pile is bigger than central pile. Distance from the biggest axial force to top pile of long pile of corner pile is bigger than edge pile and distance of edge pile is bigger than central pile. Long pile has negative friction force inside the certain range of depth. Negative friction force can be reduced gradually with depth increment, until it is zero,then positive friction force can be incresed gradually. Friction force of corner pile of long pile is bigger than edge pile and friction force of edge pile is bigger than central pile. Axial force of short pile can be reduced gradually with depth increment. Amplitude of axial force reduced of short pile first increases then reduces with depth increment. Friction force of short pile first increases then reduces with depth increment.
Key words: geotechnical engineering; long-short-pile; finite element method; axial force; positive friction force; negative friction force
发表期数: 2012年1月第2期
引用格式: 杨勇,葛忻声. 长短桩复合地基中桩荷载传递规律有限元分析[J]. 中国科技论文在线精品论文,2012,5(2):137-144.
 
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