摘要
为研究不同扩孔参数对整体桥扩孔微型桩受力性能的影响,以扩孔微型桩为研究对象,通过单向循环位移荷载进行控制,进行5根不同扩孔参数下微型桩的拟静力试验研究;同时对微型桩的桩顶位移-荷载曲线、弯矩分布、桩身位移和土抗力等进行分析.结果表明:扩孔内填料刚度越小,微型桩变形能力越好,在3.0D^6.0D(D为桩径)埋深范围内,其土抗力也越小,且对于桩身位移影响也较小,但桩身弯矩增大;相比于浅扩孔,深扩孔的微型桩承载能力小,但变形能力好和桩身弯矩较大;扩孔孔径越大,桩身土抗力越小,桩身弯矩越大,且对桩身侧向位移影响较大;扩孔深度和扩孔孔径一般控制在3倍桩径时可有效提高微型桩的变形能力.
In order to investigate the effects of different predrilled-hole parameters on the mechanical behavior of micro-piles,pseudo-static tests on five predrilled-hole micro-piles were carried out under unidirectional cyclic displacement load.The displacement-load curves,the distribution of bending moment,displacement and soil pressures were analyzed.The test results indicated that the smaller the stiffness of predrilled-hole filler was,the better the deformability of specimen was,the smaller the soil pressure of specimens was at embedded depths of 3.0D to 6.0D(D for diameter),the effect of the stiffness of predrilled-hole filler on displacements of specimens was,but the greater the bending moment of specimen was.Compared with the shallow predrilled-hole specimen,the deep predrilled-hole specimen had lower bearing capacity,but its deformability and bending moment were larger.The larger the diameter of predrilled-hole was,the lesser the soil pressure of specimen was,the larger the bending moment of specimen was.The larger diameter of predrilled-hole had significant effect on displacement of specimen.The deformability of predrilled-hole specimen was improved when the depth and diameter of predrilled-hole exceed 3 times of pile diameter.
作者
黄福云
单玉麟
庄一舟
罗小烨
陈宝春
HUANG Fuyun;SHAN Yulin;ZHUANG Yizhou;LUO Xiaoye;CHEN Baochun(College of Civil Engineering,Fuzhou University,Fuzhou,Fujian 350108,China)
出处
《福州大学学报（自然科学版）》
CAS
北大核心
2020年第3期368-374,共7页
Journal of Fuzhou University(Natural Science Edition)
基金
国家自然科学基金资助项目(51578161)
福建省高校新世纪优秀人才支持计划项目(G50011504)
福州市科技计划产学研项目(2018-G-63)。
关键词
整体桥
扩孔微型桩
扩孔参数
桩-土相互作用
受力性能
integral abutment jointless bridges
predrilled-hole micro-pile
predrilled-hole parameters
pile-soil interaction
mechanical performance
