基于圆孔扩张理论的桩基水平承载力计算方法  

AN ANALYSIS METHOD FOR THE HORIZONTAL BEARING CAPACITY OF PILE FOUNDATION BASED ON THE CAVITY EXPANSION THEORY

作　　者：张小玲[1,2] 赵景玖 孙毅龙 许成顺[1,2] ZHANG Xiao-ling;ZHAO Jing-jiu;SUN Yi-long;XU Cheng-shun(College of Architecture and Civil Engineering,Beijing University of Technology,Beijing 100124,China;Key Laboratory of Urban Security and Disaster Engineering,Ministry of Education,Beijing University of Technology,Beijing 100124,China)

机构地区：[1]北京工业大学建筑工程学院,北京100124 [2]北京工业大学城市与工程安全减灾教育部重点实验室,北京100124

出　　处：《工程力学》2021年第2期232-241,256,共11页Engineering Mechanics

基　　金：国家自然科学基金面上项目(51778020);国家自然科学基金创新研究群体项目(51421005)。

摘　　要：近年来,我国城市的基础设施建设规模不断扩大,桩基础是基础设施建设中常用的基础形式,其水平承载特性的分析计算是桩基设计中的重要问题。基于Vesic圆孔扩张理论,分析了水平荷载作用下桩侧土体的实际受力状态,推导了基于应力增量的桩侧土抗力的计算公式,进而提出了考虑摩擦效应的桩土相互作用的计算方法;并基于MATLAB编写了相应的分析程序,通过开展案例分析,验证了该计算方法的有效性;最后基于所建立的桩基水平承载力的力学模型,探讨了荷载、桩径等因素对水平受荷桩的承载特性的影响规律。In recent years,the urban infrastructure construction in China has been constantly developing.The pile foundation is a common form of foundation in infrastructure construction.The calculation of the capacity of a pile foundation is an important subject in the foundation design.Based on the Vesic expansion theory,the actual stress state of the soil on the pile side under horizontal loading is presented.A calculation method of the soil resistance on the pile side in the form of stress increment is derived,and the mechanical method of the horizontal capacity of the pile foundation considering the pile-soil interaction is proposed.The corresponding analysis program was compiled based on MATLAB software and the validity of the proposed calculation method was verified by a comparison with experimental results.The effects of the load and the pile diameter on the mechanical behavior of the pile-soil interaction system was analyzed based on the proposed mechanical model for the horizontal bearing capacity of pile foundation.

关 键 词：桩土相互作用 Vesic圆孔扩张理论 桩土摩擦效应 水平承载力 桩侧土抗力 

分 类 号：U443.15[建筑科学—桥梁与隧道工程]