电法在基桩桩长检测中的应用  

THE APPLICATION OF GEOPHYSICAL ELECTRIC METHOD TO THE INSPECTION OF FOUNDATION PILE LENGTH

作　　者：李洪涛[1,2] 王营超[2] 雷鸣[2] 刘文增[2] 

机构地区：[1]中国地质大学地球物理与空间信息学院,湖北武汉430000 [2]中国地质调查局水文地质环境地质调查中心,河北保定071051

出　　处：《物探与化探》2009年第6期737-740,共4页Geophysical and Geochemical Exploration

摘　　要：应用地下单点电极(或多点电极)与无穷远电极向地下供电产生电场分布的特点,通过检测地表电位差的分布,可以确定地下单点电极(或多点电极)的埋深,从而达到检测混凝土管桩桩长的目的。结合工程项目,对预应力管桩的实际桩长进行了检测,电测井测试对比检验说明检测是成功的。用电法检验工程桩桩长,弥补了低应变反射波法难于有效、精确检测多节预应力管桩实际桩长的困难局面,可有效发现工程质量隐患。On the basis of the electric field distribution characteristics produced by underground-orientated current supply from singlepoint electrode （or muhi-point electrode） and infinite electrode and through detection of potential difference distribution at surface, we can determine the buried depth of underground single-point electrode （ or multi-point electrode） and, on such a basis, determine the length of the concrete pipe pile. In combination with the inspection of the real pile length of the prestress pipe pile, the authors made electric logging comparative test and found that the inspection was successful. The achievements made by the authors can remedy the ineffectiveness of the low strain reflection wave method and overcome the difficulty in precise determination of the practical length of the multi-joint prestress pipe pile. It is thus held that geophysical electric method can be used to determine the length of the engineering pile and prevent the hidden trouble in engineering quality caused by saving illegally on material and labor.

关 键 词：预应力管桩长度 点电流源 直流电位差法 基桩检测 

分 类 号：P631.3[天文地球—地质矿产勘探]