摘要
低应变法可以对桩身完整性和桩长进行检测,当对桩长检测结果存疑时,可采取钻芯法进行验证;当要对整个工程桩长进行检测时,可以采用低应变法和钻芯法结合,确定一个波速代表值,当桩身混凝土波速检测值大于该波速代表值时则可以判断桩长短;结合工程实例介绍低应变法和钻芯法结合实现对复合地基全数CFG桩进行桩长检测,两种方法在桩长检测过程中可以发挥其各自的优势,互相补充;通过钻取的芯样进行抗压强度试验可以确定桩身混凝土实际强度等级及弹性模量,按混凝土波速与弹性模量和质量密度关系理论公式可以对波速代表值进行计算,理论计算结果与现场试验检测结果可以相互印证,取得良好的效果。
The low strain method can be used to estimate the integrity along the pile shaft and the length of pile.When the test results of pile length are in question,the coring method can be used to verify.When the pile lengths of the entire project are tested,a representative value of the wave velocity can be determined by combining the low strain method and the core drilling method.When the wave velocity of the pile is greater than the representative value of the wave velocity,the length of the pile can be determined.Combined with engineering examples,this paper introduces the combination of the low strain method and coring method to verify the pile length detection of all CFG piles on a composite foundation.The low strain method and coring method can demonstrate their own advantages in the process of the pile length estimation and complement each other;The actual strength grade and the elastic modulus of the pile concrete can be determined by the compressive strength test of the cored sample.The representative value of the wave velocity can be calculated according to the theoretical formula of the relationship between the wave velocity of concrete and the elastic modulus as well as mass density.The theoretical calculation results and the field test results can verify each other and achieve the good results.
作者
孟新秋
MENG Xinqiu(Beijing Huan’an Engineering Testing Co.Ltd.,Beijing 100026)
出处
《土工基础》
2024年第1期139-142,共4页
Soil Engineering and Foundation
关键词
低应变法
钻芯法
波速代表值
桩长检测
Low Strain Method
Coring Method
Wave Velocity Characteristics Value
Pile Length Estimation
