含空洞缺陷桩基超声波透射法多物理场数值模拟  

Numerical Simulation of Multi-physics Field by Ultrasonic Transmission Method for Pile Foundations Containing Cavity Defects

作　　者：纪健 李坤 JI Jian;LI Kun(Donghua University of Technology,Nanchang 330000,China)

机构地区：[1]东华理工大学,江西南昌330000

出　　处：《河北地质大学学报》2024年第3期44-50,共7页Journal of Hebei Geo University

摘　　要：随着中国建筑行业的快速发展,桩基运用也越来越广泛,桩基的完整性检测至关重要。超声波无损检测技术具有检测深度大、范围广、灵敏度高、速度快等优点,已成为桩基检测中运用最多的检测方法。超声波在混凝土中衰减严重,且在混凝土这种集合型复合材料中的传播过程十分复杂,对缺陷的判断只能定性分析,无法进行定量分析,不能准确的检测出缺陷的具体位置。为了准确有效的检测桩基缺陷的位置,通过Comsol Multiphysics有限元分析软件建立二维桩基无损检测模型,利用压力声学、固体力学模块和压电效应进行多物理场耦合,分析单孔空洞和双孔空洞在不同位置中超声波的传播规律。模拟结果表明:不管单孔还是双孔空洞,超声波在空洞后面形成缺口,与发射换能器、空洞圆心在一条直线上;通过对横向和纵向不同位置的首波声压值分析,能够有效的判断出缺陷的具体位置。With the rapid development of China's construction industry,the use of pile foundations has become more and more widespread,and the integrity testing of pile foundations is crucial.Ultrasonic nondestructive testing technology has the advantages of large detection depth,wide range,high sensitivity and high speed,and has become the most used detection method in pile foundation inspection.Ultrasound in the concrete attenuation is serious,and in the concrete this collection of composite materials propagation process is very complex,the judgment of defects can only be qualitative analysis,not be quantitative analysis,can not accurately detect the specific location of defects.In order to accurately and effectively detect the location of pile foundation defects,a two-dimensional pile foundation nondestructive testing model is established by Comsol Multiphysics finite element analysis software,and the multi-physics field coupling is performed by using pressure acoustics,solid mechanics module and piezoelectric effect to analyze the propagation law of ultrasonic waves in single-hole cavities and double-hole cavities in different locations.The simulation results show that:no matter single-hole or double-hole cavity,ultrasonic waves form a gap behind the cavity and are in a straight line with the transmitting transducer and the cavity circle center;the specific location of the defect can be effectively judged by analyzing the first-wave sound pressure values at different locations in the transverse and longitudinal directions.

关 键 词：超声波 无损检测 Comsol Multiphysics 单孔空洞缺陷 双孔空洞缺陷 

分 类 号：TU473.1[建筑科学—结构工程]