后压浆技术对桩基承载力的影响  

Bearing Capacity of Post-Grouting Pile Foundation

作　　者：冯忠居[1] 任文峰[1] 李晋[1] 

机构地区：[1]长安大学公路学院,陕西西安710064

出　　处：《长安大学学报（自然科学版）》2006年第3期35-38,共4页Journal of Chang’an University(Natural Science Edition)

基　　金：国家西部交通建设科技项目(200131800017)

摘　　要：根据桩基现场原位试验,分析研究了后压浆技术对钻孔灌注桩承载力性状的影响。试验结果表明:浆液的作用消除了桩端沉渣和桩侧泥皮的影响,使土体固结,强度增大,改善了柱的传递性能,使桩侧摩阻力增加,轴力衰减速度加快;桩侧极限摩阻力提高50%以上,达到桩侧极限摩阻力时的沉降增大6倍以上,为桩端阻力的发挥提供了更大沉降距离;相同沉降量下后压浆桩桩端阻力提高幅度较大;浆液对桩侧阻力及桩端阻力综合影响提高了桩的极限承载力。According to the data of test in situ, this paper analyzed the influence of post-grouting on the bearing capacity of boring pile. The test results show that the post-grouting diminished the influence of dregs at pile tip and mudcakes by the side of the pile; the soil around the pile can be consolidated, the strength and the property of pile transmission will be improved~ the skin friction of the pile is increased, the axial force is increased by 50 % the post-grouting pile＇s tip resistance is increased rapidly at the same settlement; the intergrated influence of the post-grouting on the skin friction and the tip resistance can greatly increase the limit bearing capacity of pile. 3 tabs, 10 figs, 6 refs.

关 键 词：桥梁工程 灌注桩 后压浆技术 承载力 原位试验 

分 类 号：U443.15[建筑科学—桥梁与隧道工程]