基于桩身弯曲破坏的路堤下筋箍碎石桩复合地基稳定分析  

Stability of geosynthetic-encased stone column composite foundation under embankment based on bending failure of columns

作　　者：张玲[1,2,3,4] 彭搏程 徐泽宇 赵明华 ZHANG Ling;PENG Bo-cheng;XU Ze-yu;ZHAO Ming-hua(College of Civil Engineering,Hunan University,Changsha,Hunan 410082,China;China Construction Fifth Engineering Bureau the Third Construction(Shenzhen)Co.,Ltd.,Shenzhen,Guangdong 518131,China;Key Laboratory of Building Safety and Energy Efficiency of the Ministry of Education,Hunan University,Changsha,Hunan 410082,China;National International Joint Research Center for Building Safety and Environment,Hunan University,Changsha,Hunan 410082,China;College of Civil Engineering and Architecture,Hunan University of Arts and Science,Changde,Hunan 415000,China)

机构地区：[1]湖南大学土木工程学院,湖南长沙410082 [2]中建五局第三建设有限公司,广东深圳518131 [3]湖南大学建筑安全与节能教育部重点实验室,湖南长沙410082 [4]湖南大学国家级建筑安全与环境国际联合研究中心,湖南长沙410082 [5]湖南文理学院土木建筑工程学院,湖南常德415000

出　　处：《岩土力学》2025年第2期413-421,共9页Rock and Soil Mechanics

基　　金：国家自然科学基金(No.52378340,No.52078205)。

摘　　要：筋箍碎石桩复合地基的稳定分析是其设计计算的主要内容之一,但针对该方面的研究尚不完善。基于路堤下不同位置筋箍碎石桩破坏模式的差异对其进行分区,考虑桩身受压和弯曲破坏,对路堤下筋箍碎石桩复合地基稳定分析方法开展了理论研究。首先借鉴钢筋混凝土桩抗弯承载力的计算方法,结合筋箍碎石桩自身物理特性及二次逼近法求解超越方程的思想,提出了筋箍碎石桩临界弯矩理论值的计算方法。随后将桩身临界弯矩和等效抗剪强度概念引入传统极限平衡法进行改进,提出了基于桩身弯曲破坏的路堤下筋箍碎石桩复合地基稳定分析方法。最后通过算例分析对比传统极限平衡法、数值强度折减法与所提方法的计算结果,证明了所提方法用于路堤下筋箍碎石桩复合地基稳定分析的合理性。The stability analysis of geosynthetic-encased stone column(GESC)composite foundations is a critical aspect of design calculations,but research in this area is still incomplete.This paper categorizes GESCs under embankments based on their distinct failure characteristics.Considering the compression and bending failures of columns,the stability analysis method for GESC composite foundations under embankments is studied.Initially,this paper proposes a method to calculate the theoretical critical bending moment of GESCs,considering their physical properties and using the quadratic approximation method for solving transcendental equations,by referring to the calculation method for the bending bearing capacity of reinforced concrete piles.Subsequently,the concepts of critical bending moment and equivalent shear strength are introduced to modify the traditional limit equilibrium method,and a stability analysis method based on bending failure of columns for GESC composite foundations under embankments is proposed.Finally,the results of the method,the traditional limit equilibrium method,and the numerical strength reduction method are compared using an example of laboratory model test,to verify the rationality and applicability of the method.

关 键 词：路堤 筋箍碎石桩 复合地基 稳定分析 弯曲破坏 

分 类 号：TU473[建筑科学—结构工程]