1程序模块及计算方法-水利水运工程学报.doc

基于MATLAB-GUI的刚性桩复合地基沉降计算分析 张中流，刘慈军2，何宁1，周彦章1，国建飞2，周玉娟2 （1.南京水利科学研究院，江苏南京 210029；2.宁波市高等级公路建设指挥部，浙江宁波 315192） 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，该计算方法夸大了桩的作用，尚不能精确地反应地基土的沉降。针对这一问题，为了更精确、更方便得计算沉降，本文从沉降产生的机理出发，考虑到刚性桩复合地基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的可行性，并将程序计算结果与传统方法进行比较，发现该计算方法有更好的精确性，同时程序略去了繁琐的计算过程，便于此计算方法的普及。 关键词：复合地基；土拱效应；桩侧摩阻力；沉降；可视化程序 中图分类号：TU473 文献标志码：A Analysis for settlement of rigid pile composite foundation based on MATLAB-GUI ZHANG Zhongliu1, LIU Cijun2, HE Ning1, ZHOU Yanzhang1, GUO Jianfei2, ZHOU Yujuan2 (1.Nanjing Hydraulic Research Institute, Nanjing 210029, China; 2. Ningbo Highway Construction Headquarters, Ningbo, 315192, China) Abstract: With the widely use of rigid pile composite foundation, the calculation method for its settlement becomes much more important. Currently, we mainly take the results of composite modulus method as 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 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’s programmed with MATLAB-GUI language for convenience. Through the validation by engineering cases, the calculated results of the program are well agreed with the observed ones, so the calculation method is feasible in some degree. Furthermore, by compar