巨型整体式筒仓基础有限元分析  

The Analysis of the Foundation of Monolithic Huge Silo by Finite Element Method

作　　者：丁伟亮[1] 陈明祥[1] 黄小玲[1] 袁子厚[2] 

机构地区：[1]武汉大学土木建筑工程学院,430072 [2]重庆交通大学结构工程重点实验室,400074

出　　处：《特种结构》2008年第1期34-37,47,共5页Special Structures

基　　金：项目资助:重庆交通大学结构工程重点实验室开放基金资助(No:20040005)

摘　　要：超大直径贮煤筒仓的堆煤区面积大,采用天然地基可带来显著的经济效益。然而,堆煤区的竖向煤压力将使得基础土体产生沉降和水平径向位移,进而对筒仓壁承台下的桩基产生较大的负摩擦力和水平推力,正确计算分析这两个作用力及其对桩内力分布的影响并提出合理的桩基设计方案对筒仓基础设计至关重要。本文以河源电厂120m直径贮煤筒仓为工程背景,对三种不同的桩基方案,进行了三维有限元计算分析,计算模型中,土体假定为理想弹塑性材料,服从Drucker Prager屈服准则和非关联流动法则,而且还考虑了桩土之间的相互摩擦接触作用。通过计算结果的比较最终得出安全、经济适用的桩基设计方案,从而论证了堆煤区采用天然地基的可行性。If no piling is designed for the large coal stack wound in the coal storage silo with big diameter, the cost of the silo will be cut down greatly. However, the pressure exerted by coal on the ground soils causes its settlement and radial displacement. Subsequently, the piles under the silo wall need to withstand a great negative friction and a horizontal soil pressure. It is the most important to the silo design that those two forces and its effect on the piles is predicted correctly and then a rational scheme of the pile foundation is put forward. On the background of the 120 meter diameter silo of He Yuan Power Station, this paper analyzes three different schemes of the pile foundation using finite element method. In the finite element analysis, soil is assumed to be perfectly plastic with Drucker-Prager criterion and non-associated flow rule and soil-pile interaction is taken into account. Based on the result of the analysis, we get a safe and economical scheme of the pile foundation. Accordingly, it shows that no piling in the coal stack ground in the project is available.

关 键 词：筒仓 有限元 ABAQUS 桩土相互作用 土体塑性 

分 类 号：TU476.9[建筑科学—结构工程]