圆形煤场采用管桩复合地基的有限元分析  

Finite element analysis of applying pipe-piled foundation to huge silo

作　　者：刘欣良[1] 葛小丰[1] 韦华[1] 汪碧飞[2] 何小飞[1] 陈明祥[2] 

机构地区：[1]江苏省电力设计院,江苏南京211102 [2]武汉大学土木建筑工程学院,湖北武汉430072

出　　处：《武汉大学学报（工学版）》2009年第S1期348-351,共4页Engineering Journal of Wuhan University

摘　　要：由预应力管桩、托板、碎石垫层(加筋土工格栅)与桩间土所组成的复合地基常用于电厂大直径圆形煤场的地基处理,它能将堆载大部分传至深层土体,减少土体沉降及水平变形,进而减少对挡煤墙结构下桩基的影响.应用有限元方法分析这种复合基础的承载与传力机理,从而为设计提供指导.首先,建立单桩模型,分析了桩土之间的载荷分担比及其相关因素的影响作用;然后,建立包括煤场内管桩基础与挡煤墙结构及其下部桩基础在内的有限元模型,分析管桩复合基础在减小挡煤墙结构下桩基所受水平力中所起的作用.计算结果表明,分担比随垫层力学参数的提高、垫层厚度的增加、托板尺寸的增大而增大;管桩复合基础可以显著减小挡煤墙结构下桩基所受水平力.Composite foundation consisting of prestressed concrete pipe-pile,slab,gravel cushion(geogrid) and soil is used in the foundation treatment of coal storage silo with large diameter in power plant.It can spread most of load to the deep soil,reducing settlement and horizontal deformation of the soil.Consequently it reduces the impact on the pile of silo structure.The finite element method is used to analyze the foundation.First,the factors influencing pile-soil load sharing ratio,are analyzed.And then the finite element modeling of pipe-piled foundation and cast-in-place pile is established.The results indicate that the pile-soil load sharing ratio increases with increase of cap size,gravel cushion thickness and improvement of mechanical parameters of gravel cushion.Bearing capacity of cast-in-place pile and pipe-pile is sufficient.Design plan of foundation is reasonable.

关 键 词：圆形煤场 有限元分析 管桩复合地基 荷载分担比 灌注桩 

分 类 号：TU473.1[建筑科学—结构工程]