摘要
随着刚性桩复合地基技术的广泛应用,沉降计算在其设计中越来越重要。目前刚性桩复合地基沉降计算主要采用复合模量法,但在处理软土地基时,该方法夸大了桩的作用,尚不能精确反应地基土的沉降。针对这一问题,从沉降产生机理出发,考虑刚性桩复合地基的沉降主要由土拱效应下土顶承担的荷载和桩的侧壁摩阻力两部分引起,根据土力学基本原理,结合已有的土拱效应和桩身荷载传递的研究成果,提出一种正方形布桩下的刚性桩复合地基沉降计算方法并利用MATLAB-GUI编译成可视化程序。通过实例验证,程序计算结果与工程实测值吻合较好,说明该程序计算方法具有一定可行性,并将程序计算结果与传统方法比较,结果表明该计算方法精确性较高,计算过程简便,易于普及。
With the wide use of rigid pile composite foundation,the calculation method for its settlement becomes much and more important. Currently,we mainly take the results of the composite modulus method as a designing reference,but this method is still not accurate yet when we handle soft ground for its exaggeration in pile＇s function.From the aspect of settlement generation mechanism,the settlement is caused by two main components： one is the distributed stress on the top surface of the soil determined by soil arching effect; the other is the skin friction distributed along the depth of the pile influenced by pile-soil relative displacement. According to the fundamental principles of soil mechanics,a more accurate calculation method for the settlement in pile＇s square layout is proposed based on current research achievements about soil arching effect and pile＇s load transfer mechanism;meanwhile,it is programmed with MATLAB-GUI algorithm language for convenience. Through the validation by engineering cases,the calculated results of the program well agree with the observed ones,so the calculation method is feasible in some degree. Furthermore,by comparison with the traditional method,this method has better accuracy. Last but not the least,the program is also easily promoted in practice as it doesn＇t need to go through the complex process of calculation.
出处
《水利水运工程学报》
CSCD
北大核心
2016年第2期76-82,共7页
Hydro-Science and Engineering
基金
国家自然科学基金面上项目(51579152)
宁波市交通科技委科技计划项目(201312)
关键词
复合地基
土拱效应
桩侧摩阻力
沉降
可视化程序
composite foundation
soil arching
pile＇s skin friction
settlement
visual program
