成层土中竖向受荷桩沉降性状简化计算方法  

Simplified Calculation Method for Settlement Behavior of Vertically Loaded Pile in Layered Soil

作　　者：王立兴 吴文兵[1] 梅国雄 闻敏杰[1,3] 徐美娟 WANG Lixing;WU Wenbing;MEI Guoxiong;WEN Minjie;XU Meijuan(Faculty of Engineering,China University of Geosciences,Wuhan 430074,China;College of Civil Engineering and Architecture,Guangxi University,Nanning 530004,China;School of Civil Engineering and Architecture,Zhejiang Sci-Tech University,Hangzhou 310018,China)

机构地区：[1]中国地质大学(武汉)工程学院,湖北武汉430074 [2]广西大学土木建筑工程学院,广西南宁530004 [3]浙江理工大学建筑工程学院,浙江杭州310018

出　　处：《湖南大学学报（自然科学版）》2022年第7期197-204,共8页Journal of Hunan University:Natural Sciences

基　　金：国家自然科学基金资助项目(52178371,51878634,52168046)。

摘　　要：基于应力泡形虚土桩模型和考虑桩土界面初始临界摩阻力的改进双曲线模型,提出了一种可以考虑桩端应力扩散效应和桩土界面初始临界摩阻力影响的竖向受荷单桩沉降简化计算方法.首先,利用该计算方法分析讨论了模型参数对单桩沉降的影响程度,并给出了合理的取值范围;其次,将用该计算方法得到的结果与现场实测数据对比分析,验证了本文计算方法的合理性,并进一步分析研究了不同桩顶荷载作用下竖向受荷桩的桩身压缩与桩端土体沉降所占比重关系、桩身轴力分布规律以及桩侧摩阻力发挥特性等.本文的计算方法参数明确,应用简便,可以为桩基础设计提供更为准确的沉降值,具有广泛的工程应用前景.Based on the stress-bubble fictitious soil-pile model and the improved hyperbolic model considering the initial critical frictional resistance of the pile-soil interface,a simplified method for calculating the settlement of vertically loaded single pile is proposed,which can consider the effect of stress diffusion at the pile tip and the initial critical frictional resistance at the pile-soil interface.Firstly,the influence degree of the model parameters on the settlement of a single pile is analyzed and discussed by using the present calculation method,and the reasonable value ranges of model parameters are given.Then,the rationality of the present calculation method is verified by comparing the results obtained using the present calculation method with the field measured data.Furthermore,the proportion of pile compression and pile tip soil settlement,the distribution law of pile axial force and the characteristics of pile lateral friction resistance under different pile top loads are further analyzed and studied.The present calculation method has clear parameters and simple application,which can provide a more accurate settlement value for pile foundation design,thus having a wide engineering application prospect.

关 键 词：竖向受荷桩 沉降性状 虚土桩模型 双曲线模型 桩身轴力 桩侧摩阻力 

分 类 号：TU473.1[建筑科学—结构工程]