一、概述 随着城市大型建筑结构不断地涌现,高层建筑,桥梁,电力开发,钻孔灌注拉在基础工程中得到广泛应用。但是,由于施工工艺及地质条件等影响,会产生断桩,夹层、孔洞,疏松及缩径等缺陷,影响桩基力学特性,桩基的强度和承载力,造成桩的质量事故。据国内外统计资料表明,灌注桩中 First, an overview With the continuous emergence of large urban structures, high-rise buildings, bridges, electric power development, bored pull in the basic engineering has been widely used. However, due to the influence of construction technology and geological conditions, there will be defects such as broken pile, interlayer, hole, looseness and diameter reduction, which will affect the mechanical properties of pile foundation, the strength and bearing capacity of pile foundation and cause pile quality accidents. According to statistics at home and abroad show that in the piles