CFG桩复合地基桩身应力数值分析  

Stress Numerical Analysis of CFG Pile Composite Foundation

作　　者：陈晓霞[1] 姚海慧[1] 黄茂松[2] 

机构地区：[1]安阳工学院土木与建筑工程学院,河南安阳455000 [2]同济大学地下建筑与工程系,上海200092

出　　处：《煤炭技术》2011年第10期118-120,共3页Coal Technology

基　　金：河南省高校杰出科研人才创新工程项目(HAIPURT);河南省高等学校创新人才培养工程(2005KYCX015)

摘　　要：为了更好地掌握CFG桩复合地基的桩身应力特性,借助大型有限元ANSYS软件,考虑复合地基中各种材料的非线性特性,对CFG桩桩身应力特性进行了数值模拟分析。在荷载作用下,桩身应力最大值分布在桩长深度比值z/L为0.2～0.4处,随着荷载的增大,最大值的位置逐渐上移,同时曲线由平缓变陡峭,最大值增加的幅度加大。桩身应力随褥垫层厚度增大而减小,随着褥垫层模量增加而相应增加,随桩间土模量的减小而增加。随着桩长的增加,桩体的应力增加,但增加的幅度逐渐减小。在荷载一定的情况下,CFG桩存在临界桩长。To master the shaft stress characteristics of CFG pile well, based on the finite element software ANSYS, discusses the nonlinearity of materials in composite foundation, the numerical analysis for the shaft stress characteristics of the CFG pile is performed. The maximum of the shaft stress is distributed to pile-length ratio z/L 0.2-0.4, along with the load increasing to a level, the maximam position, moves upward gradually,meanwile the curves change from gentle to steep, the maximam range increases. The shaft stress decreases with cushion thickness increasing, increases with cushion modulus increasing, increases with the modulus of the soil between the piles decreasing and with pile length increases, the shaft stress of pile increases, but increasing tendency decreases＇ gradually. CFG pile has a threshold length ureter a certain load.

关 键 词：CFG桩 复合地基 有限元软件 桩身应力 

分 类 号：TU473[建筑科学—结构工程]