昔格达泥岩中后压浆冲孔灌注桩承载力研究  

Bearing capacity of bored piles after grouting in Xigeda mudstone

作　　者：康景文 孟贵林 李圣 颜光辉 彭仕明 黄练红 

机构地区：[1]中国建筑西南勘察设计研究院有限公司,四川成都610081 [2]四川省绵阳市建设局设计处,四川绵阳621000 [3]四川省西昌市建设工程质量监督站,四川西昌643000

出　　处：《岩土工程学报》2010年第S2期123-126,共4页Chinese Journal of Geotechnical Engineering

摘　　要：以第四系—冰期昔格达组泥岩对桥梁基础沉降不利影响分析为基础,通过对不压浆和后压浆冲孔灌注桩承载力、桩身轴向力、侧摩阻力和桩端阻力等内容的试验及测试,研究了置于昔格达泥岩层中桩的承载力大小、桩身轴向力和桩侧摩阻力的分布规律以及对承载力的贡献程度,分析了压浆处理对桩基工程特性的作用效果,得到了在此地层中冲孔灌注桩无论压浆与否均呈现摩擦桩的特点和压浆处理后承载力可提高近50%,为四川地区昔格达组泥岩中的冲孔灌注桩基的勘察、设计、检验以及压浆技术对减少沉降的应用提供了参考。Based on adverse impact analysis on settlement of bridge foundation caused by Quaternary-Ice Age Xigeda mudstone,values of bearing capacity,distribution of axial force and side frictional resistance of piles and impact on bearing capacity in the Xigeda mudstone are studied by the tests of bearing capacity,axial force,side frictional resistance of piles and resistance of pile tip of bored piles under both the not grouting and after grouting.At the same time,by analysis on the effect of properties of piles with grouting treatment,it can be received that bored pile in above stratum presented the characteristics of friction piles whether or not grouting and bearing capacity can increase 50% after grouting.In a word,it can provide reference for investigation,design and test of foundation of bored piles in Sichuan Xigeda mudstone and technology of grouting for reducing the settlement.

关 键 词：冲孔灌注桩 桩端压浆 桩侧压浆 

分 类 号：U443.15[建筑科学—桥梁与隧道工程]