西宁泥岩后压浆桩承载性能试验研究  

Test on Bearing Behavior of Pile-Base Post-Grouting Rock-Socketed Pile in Argillaceous Area of Xining

作　　者：冯向强 任慧霞 缪云[3] 戴国亮[3] 

机构地区：[1]西宁海湖开发建设管理有限公司,青海西宁810012 [2]西宁市城市建设开发总公司,青海西宁810001 [3]东南大学土木工程学院,江苏南京210096

出　　处：《山东交通学院学报》2011年第1期56-60,共5页Journal of Shandong Jiaotong University

基　　金：国家自然科学基金资助项目(50908048)

摘　　要：结合西宁湟水河大桥1根嵌岩桩桩底压浆前后的试验资料,对比分析了桩底压浆对嵌岩桩桩端阻力和桩侧摩阻力特性发挥的影响:嵌岩桩经过桩底压浆,改善了桩底沉渣的受力特性,增大了沉渣的强度和变形模量;在浆液压力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,增强桩身与桩周、桩端整体嵌固能力,嵌岩桩整体承载力提高幅度为14%。其中端阻力提高23%,侧端阻力提高11%。试验研究成果直接用于该工程桩基设计,同时为类似嵌岩桩基设计施工提供参考。Based on the test data of a socketed pile before and after pile-base post-grouting in Xining Huangshui river bridge, the influence of rock-socketed pile on exertion of side resistance and tip resistance were analyzed ： through pile-base post-grouting for socketed pile, the characteristics of sediment is improved obviously which increased the strength and reduced deformation of sediment; at the same time, under the pressure of slurry mud the pile skin replaced and filled, the soft rock around the pile after pile is penetrated and compacted to some extent, which enhance the cohesive capacity of the whole nlounted of pile and the whole bearing capacity of rock-socketed pile is improved by 14%, in which tip resistance increased 23% and side resistance 11%. The test results can be used directly in engineering pile-base design and offer references to the similar socketed pile design and constriction.

关 键 词：嵌岩桩 承载性能 桩侧阻力 桩端阻力 桩底后压浆 

分 类 号：U443.15[建筑科学—桥梁与隧道工程]