地表试验条件下灌注桩桩侧阻力分析  

Research on Side Resistance of Cast-in-place Piles in Field Test

作　　者：闫跃军 

机构地区：[1]洛阳规划建筑设计有限公司,河南洛阳471000

出　　处：《建筑科学》2009年第11期51-53,共3页Building Science

摘　　要：采用地表试验条件下的试验结果,进行桩侧阻力、桩端阻力的划分、取值,实质上仍然是一种间接方法。目前大多采用"扣除法",其方法经验和人为因素较大。另一方法是在桩身埋设元件对桩身应力进行测量,以土层界面设监测点,测量每层土的侧阻力,从而计算确定桩端阻力及单桩承载力。本文以某实测工程为例,研究了地表试验条件下后压浆灌注桩桩侧阻力、桩端阻力考虑实测桩径的试验取值方法,讨论后压浆灌注桩产生桩侧负摩阻力的原因和对桩侧阻力计算产生的影响,提出以计算基底以上综合侧阻力、基底以下综合侧阻力和总桩端阻力(含端部部分侧阻力)结果,进行桩侧阻力取值计算的实用方法。By using the field test result, the pressures both at the bottom and at the lateral of the piles are analyzed. Actually, it is a indirect method. Deduction method is used in most constructions recently , however, the by this method is influenced experiences and artificial factors. Another method is burying the equipments in the piles to test the pressure, and calculate the bearing capacity of the piles. This paper, based on the field test, studies the resistance beside and at the bottom of the bored pile with post grouting, and the value taking method. The influence of the grouting is researched. The practical calculation method is presented to calculate the resistance both above and under the base.

关 键 词：后压浆 灌注桩 非原位测试 承载力 桩侧阻力 

分 类 号：TU473.14[建筑科学—结构工程] TU413[建筑科学—土工工程]