摘要
湿陷性黄土结构非常特殊,其沉降具有不连续性、突发性、不可逆等特点,因此常对桥梁桩基造成威胁。如何确定黄土湿陷性变形桥梁桩基在竖向载荷下的承载特性一直困扰着国内外学者。根据前人的研究现状,将新疆高速湿陷性黄土地区的桥梁桩基项目列为研究对象,首先对其进行非均匀变形下的承载实验,介绍了实验原理和模型装置,并给出实验流程。基于实验结果,研究桥梁桩基的承载特性,分析了单桩承载力、单桩桩身轴力、单桩桩侧摩阻力、群桩承载力等特性。通过对单桩、群桩的桩基静载试验研究,得出单桩摩擦阻力最大部分在桩身中下部,湿陷性黄土沉降随着桩数的增加而降低。希望为今后湿陷性黄土桥梁桩基承载特性研究提供理论帮助。
Settlement of collapsible loess structure is very special,it has the characteristics of discontinuity,sudden,irreversible,so often a threat to the bridge pile foundation. How do you determine the collapsibility loess deformation of bridge pile foundation under vertical load bearing characteristics has been plagued by scholars at home and abroad. According to predecessors＇ research status,the xinjiang highway bridge of collapsible loess area pile foundation project as the research object,first carries on the non- uniform deformation of bearing experiment,this paper introduces the principle and model experiment device,and the experiment process is given. Based on the experimental results,the research of bridge pile foundation load- bearing characteristics,analyzes the bearing capacity of single pile,the single axial stress of pile,the pile side friction resistance,pile bearing capacity.Through single pile static load test of pile foundation,pile group study,it is concluded that in most of the single pile frictional resistance is the most in the pile body part,settlement of collapsible loess increased with the increase of pile number reduced. Hope it can provide theoretical help for bridge pile foundation load- bearing characteristics collapsible loess study in the future.
出处
《北方交通》
2015年第2期5-8,共4页
Northern Communications
关键词
湿陷性
承载特性
黄土
桥梁桩基
Wet
Load-bearing characteristics
Loess
Bridge pile foundation
