桩筏基础筏板的厚度研究  

Study on Determination of Raft Thickness of Pile Raft Foundation

作　　者：王杰[1] 孙峰[2] 杨洪[1] 吕哲[1] 

机构地区：[1]沈阳建筑大学土木工程学院,辽宁沈阳110168 [2]中国科学院成都山地灾害与环境研究所,四川成都610041

出　　处：《沈阳建筑大学学报（自然科学版）》2009年第6期1111-1114,共4页Journal of Shenyang Jianzhu University：Natural Science

基　　金：辽宁省建设厅科技项目(2007051)

摘　　要：目的研究减少桩筏基础筏板厚度,降低基础造价.方法采用有限元程序、数值分析的手段,利用有限元分析软件分别建立起了桩土、桩筏基础与地基土、上部结构桩筏基础与地基土共同作用分析模型,通过建立三维模型,分析和研究了筏厚不同情况下桩顶反力、筏板最大挠度及挠度差、筏板内力分布等变化规律.结果在保证基础的差异沉降符合建筑物安全工作的要求的基础上,筏板最佳厚度的取值主要与筏板基础的长度、宽度、布桩的桩间距,筏板基础的砼强度等级以及群桩中单桩刚度有关.结论得出了筏板最佳板厚取值的理论公式.直接结果使筏板可以减薄,降低基础造价.为工程设计人员在设计筏板基础时,提供依据.This paper aims at studying the pile -raft foundation raft thickness, which can make the cost of foundation decrease much more. According to the use of the finite element procedures and the method on the numerical analysis, it used the finite element analysis software and established the pile soil, the pile raft foundation and the foundation soil separately, the superstructure pile raft foundation and the foundation soil synergy analysis model, set up 3-dimensions finite element model of piled raft foundations. Analysis and research of the different of the plank thickness show the change of counterforce on the pile, the plate of the maximum flexibility and the flexibility disparity, the plate internal force. To ensure that the diversity subside comply with the building on the basis of the safety requirement, it chose the optimal thickness of plate mainly on the plate＇s length, the width, the distribution of the pile＇s distance, the plate＇s strength grade of the concrete, and the group of the piles＇ rigidity of the single pile. An experiential equation for choosing the optimal thickness of plate is given, which can make the raft become thinner and the cost of foundation be decreased much more. This article can offer a reference for designers to determine the plank thickness in the project.

关 键 词：筏板厚度 桩顶反力 筏板挠度 筏板内力 

分 类 号：TU471.15[建筑科学—结构工程]