轴向荷载下群桩沉降简化计算方法对比  

Comparison of Simplified Calculation Methods of PileGroup Settlement under Axial Load

作　　者：赵心涛 任有华[1] 赵海明 ZHAO Xintao;REN Youhua;ZHAO Haiming(College of Agriculture and Forestry Science and Technology,Weifang Vocational College,Weifang 261041,China)

机构地区：[1]潍坊职业学院农林科技学院,山东潍坊261041

出　　处：《成都大学学报（自然科学版）》2022年第4期432-439,共8页Journal of Chengdu University（Natural Science Edition）

摘　　要：对现有群桩沉降计算方法加以归纳总结,将计算方法总体分为经验公式法和解析法2大类,并对每类方法的建立过程和前提条件进行了归纳总结.最后,以3个典型的数据比较充分的工程案例为背景,对典型计算方法的局限性和适用范围加以比较.结果表明,土的塑性影响仅限于桩周土的狭窄区域,而桩间相互作用位移基本上保持弹性,在非线性分析框架内使用叠加原理(即相互作用因子法)是可行的.在设计方法中是否需要考虑非线性相互作用取决于群桩规模的大小.经验方法有隐含的适用范围,实际使用过程中不宜将适用范围盲目扩大.特别是从小桩组分析发展而来的方法,对大桩组的桩相互作用提供了过于保守的预测.In order to clarify the accuracy and application scope of various calculation methods,this paper summarizes the existing settlement calculation methods of pile groups,divides the calculation methods into empirical formula method and analytical method,and summarizes the establishment process and preconditions of each method.Finally,based on three typical engineering cases with sufficient data,the limitations and application scope of typical calculation methods are compared.The results show that the plastic effect of soil is limited to the narrow area of soil around the pile,and the displacement of pile interaction is basically elastic.It is feasible to use the superposition principle(i.e.interaction factor method)in the frame of nonlinear analysis.Whether the nonlinear interaction needs to be considered in the design method depends on the size of pile group.The empirical method has an implied scope of application,which should not be expanded blindly in actual use.In particular,the method developed from the analysis of small pile groups provides an overly conservative prediction of pile interaction of large pile groups.

关 键 词：群桩沉降 轴向荷载 简化计算方法 相互作用 

分 类 号：TU473.1[建筑科学—结构工程]