钉形水泥土双向搅拌桩桩身强度差异原因分析与检测探讨

本文简单介绍了钉形水泥土双向搅拌桩的形成及其特点，通过大量的桩身标准贯入试验和室内无侧限抗压强度试验，建立了桩身标准贯入击数与桩身无侧限抗压强度以及桩体分段深度的数学关系式，同时对钉形水泥土双向搅拌桩桩身强度不一致的现象进行了深入分析，对桩身强度检测项目和方法进行了深入探讨，并初步确定了武汉新区桩身强度检测的项目和方法。提出采用加权平均值作为桩身强度设计和检测的标准更为妥当。

Discussion of pile strength testing methods and causes analysis of strength difference of T-shaped bidirectional deep mixing column

The formation and characteristics of T-shaped bidirectional deep mixing column were described. Through huge amounts of standard penetration tests(SPT) on pile shaft and indoor unconfined compression tests, correlations between SPT values and the strength of unconfined compression tests were established, and the correlations between SPT values and the depth of piles were also discussed. Testing method of pile strength and strengths, difference along the pile depth were elaborately analyzed. It was preliminary determined to use the strength of pile to substitute the results of unconfined compression tests in Wuhan New District pile strength investigation project. It is suggested that the weighted average value of pile strengths should be adopted for pile designing and strength testing.