桩底后压浆的长大嵌岩桩承载性能试验.pdf

第26 卷 第4 期 建筑科学与工程学报 Vol. 26 No. 4 2009 年12 月 Journal of Architecture and Civil Engineering Dec. 2009 : 167 2049( 2009) 王红伟, 戴国亮, 叶 涛, 龚维明 ( , 210096) : 根据 1 根长大嵌岩桩桩 压浆前后的试验数据, 对比分析了桩 压浆对嵌岩桩桩端阻力和桩 侧摩阻力发挥特性的影响结果表明:桩 压浆有效地改善了嵌岩桩桩 沉渣的受力特性, 增大了 沉渣的强度和变形模量, 同时在水泥浆液压力作用下对桩侧泥皮进行置换填充, 在一定程度上渗 透挤密桩周泥岩, 增强了桩身与桩周桩端整体的嵌固能力, 嵌岩桩整体承载力提高幅度达 14%; 该试验研究成果可直接用于工程桩基设计, 同时为类似嵌岩桩基设计施工提供了参考 : 嵌岩桩; 桩 沉渣; 桩端阻力; 桩 后压浆 : T U47 . 1 : A Test on Bearing Behavior of Long and Large Socketed Pile Pilebase Postgrouting WANG Hongw ei, DAI Guoliang, YE T ao, GONG Weiming ( Key Laboratory of Concrete and Prestressed Concret e St ructure of Ministry of Educat ion, Southeast University, Nanjing 210096, Jiangsu, China) Abstract: Based on the test data of one long and large socketed pile before and after pilebase grouting, the influence on exertion of side resistance and end resistance w as comparatively analyzed. The results show that through socketed pile pilebase postgrouting, the force characteristics of pilebase sediment w ere improved pow erfully , w hich increased the strength and deformation moduli of sediment. At the same time, the pile skin w as replaced and filled under the pressure of slurry mud, and to some extends, the soft rock around the pile is penetrated and compacted, w hich enhances the w hole mounted capacity of pile and the w hole bearing capacity of socketed pile is improved by 14%. T he research production can be applied to design of piles. It can also provide references for design and construction of similar socketed pile. Key words: socketed pile; pilebase sediment; end resistance; pilebase postgrouting , 0