考虑桩土协调变形下的水泥搅拌桩复合地基竖向受力计算  

Vertical Force Calculation of Cement Mixed Pile Composite Foundation Considering Coordinated Pile-soil Deformation

作　　者：熊家全 代建波[2] 李皓 XIONG Jiaquan;DAI Jianbo;LI Hao(Guangzhou Traffic Engineering Quality Supervision Station,Guangzhou,Guangdong 511430,China;School of Civil Engineering,Xi'an Shiyou University,Xi'an,Shaanxi 710065,China;Guangzhou Municipal Engineering Testing Co.,Ltd.,Guangzhou,Guangdong 510520,China)

机构地区：[1]广州市交通工程质量监督站,广东广州511430 [2]西安石油大学土木工程学院,陕西西安710065 [3]广州市市政工程试验检测有限公司,广东广州510520

出　　处：《公路工程》2025年第1期144-152,206,共10页Highway Engineering

基　　金：国家自然科学基金青年科学基金项目(51808446);广东省住房和城乡建设厅研究开发项目(2022-K26-503115)。

摘　　要：水泥搅拌桩复合地基在软基处理领域应用较为普遍。以修正的复合地基加固区土体压缩位移理论为基础,基于桩-土变形协调方程,考虑中性面上、下桩土受力情况,分别导出了桩顶位置桩土应力比、中性面上、下桩周摩阻力、桩身竖向应力的解析表达式。通过复合地基承载力试验、MATALB软件计算及FLAC^(3D)模拟结果,验证了理论公式的正确性。分析了不同因素对桩土竖向受力情况的影响,结果显示桩身弹性模量对桩土应力比影响较明显,桩长对桩土应力比影响较小;在中性面位置桩身竖向应力达到最大值,桩周摩阻力为零;顶部荷载及桩身弹性模量对桩身受力影响较大,桩长对桩身受力影响较小。Cement mixing pile composite foundation is widely used in the field of soft foundation treatment.Based on the modified theory of soil compression displacement in the reinforced zone of composite foundation,and based on the pile-soil deformation coordination equation,considering the stress situation of pile-soil above and below the neutral plane,the analytical expressions for the pile-soil stress ratio at the pile top position,the frictional resistance around the piles above and below the neutral plane,and the vertical stress of the pile body are derived.Through the bearing capacity test of composite foundation,MATLAB software calculation and FLAC^(3D) simulation results,the correctness of the theoretical formula is verified.The effect of different factors on the vertical stress of pile-soil is analyzed.The results show that the elastic modulus of the pile has a significant effect on the pile-soil stress ratio,while the effect of the pile length on the pile-soil stress ratio is small.At the neutral plane position,the vertical stress of pile reaches the maximum value and the friction resistance of pile is zero.The top load and elastic modulus of the pile have great influence on the pile stress,while the pile length has little influence on the pile stress.

关 键 词：水泥搅拌桩 复合地基 桩土应力比 位移 桩身竖向应力 摩阻力 

分 类 号：U416.1[交通运输工程—道路与铁道工程]