基于三次曲线模型CFG桩复合地基中性点位置计算  

Calculation of neutral point location of CFG pile composite foundation based on the model of cubic curve

作　　者：郅彬[1] 李戈[2] 武李和乐 郭洁 任兴[1] ZHI Bin;LI Ge;WU Lihele;GUO Jie;REN Xin(School of Architecture and Civil Engineering,Xi′an University of Science And Technology Xi′an 710054,China;School of Civil Engineering,Xi′an Univ.of Arch.& Tech.Xi′an 710055,China;Shaanxi Architectural Design and Research Institute Co.,Ltd.,Xi′an 710018,China)

机构地区：[1]西安科技大学建筑与土木工程学院,陕西西安710054 [2]西安建筑科技大学土木工程学院,陕西西安710055 [3]陕西省建筑设计研究院有限责任公司,陕西西安710018

出　　处：《西安建筑科技大学学报（自然科学版）》2019年第3期350-354,374,共6页Journal of Xi'an University of Architecture & Technology(Natural Science Edition)

基　　金：国家自然科学基金项目(41172262);陕西省重点科技创新团队计划项目(2014KCT-30)

摘　　要：为更好的体现桩侧摩阻力变化,将桩侧摩阻力随深度的关系变化曲线用三次曲线方程z=kτ^3+C代替,考虑桩土变形协调,建立平衡方程推导出CFG桩复合地基含有中性点位置的表达式与极限承载力表达式;依据现场CFG桩复合地基高应力静载荷试验数据对表达式进行对比验证对比结果表明基于三次曲线模型并考虑桩土变形协调下计算结果具有合理性;结合表达式,探究不同褥垫层厚度与桩径对中性点位置的影响并讨论其影响机制结论可为CFG桩复合地基的研究提供一定的参考价值.In order to better reflect the change of pile side friction resistance,Instead of The Model of Cubic Curve by relation curve of side friction of pile depth,Considering deformation compatibility of pile and soil,The expression of neutral point position and the expression of ultimate bearing capacity of CFG pile composite foundation are derived by establishing the equilibrium equation;on the basis of field of CFG pile the composite foundation of high stress compared to the expression data of static load test results show that The Model of Cubic Curve and considering the deformation of pile and soil under the coordination of calculated results is reasonable based on the combination of research;expression,different thickness of cushion and pile diameter on the position of the neutral point and discuss its influence mechanism.The conclusion can provide some reference value for the study of CFG pile composite foundation.

关 键 词：三次曲线模型 CFG桩复合地基 中性点 褥垫层厚度 桩径 

分 类 号：TU472.21[建筑科学—结构工程]