Experimental Research On Seismic Wave Detecting Of Abnormity Inside Concrete Medium

Concrete is one of the most widely used and largest consumption amount building materials in the world. But concrete is also accompanied by many problems while been widely used, when poor construction management, durable years growth or external harmful environment happened, concrete holes, broken belt, leakiness areas and other anomalous bodies may appear in the internal medium of concrete, which will cause huge problems to civilians’personal economic security. So the nondestructive testing to concrete medium is a indispensable link in engineering construction. The current commonly used NDT methods such as ultrasonic method, ground penetrating radar (GPR) method and so on.The thesis based on the existing concrete nondestructive examination technology method study, try using seismic wave reflection scanning technologythe which from basic principles of seismic waves to choose the appropriate observation system to text it by the NDT. First conduct nondestructive examination experiment for the concrete pavement containing underground pipes, and to handle data processing for acquired high-frequency signals. Finally through the comparative analysis of ultimate detection effect picture and actual pipelines location, it shows that in the nondestructive examination for internal concrete medium anomalous bodies, seismic wave reflection scanning technology has great merits such as simple operation in the worksite, less interference factors, accurate detecting scope for the delineated anomalous bodies.Built on the theoretical and experimental studies, seismic wave reflection scanning technology can be applied to the overpass bridge pier examination. Through the analysis and judgment to the detection result diagram, it achieves the accurate and rapid nondestructive examination for diagnosing whether it has anomalous bodies inside the bridge pier.The thesis also points out the lack sides of seismic wave reflection scanning technology in the concrete medium examination, especially the discrimination limitations for anomalous bodies’type, it can only determine the anomalous bodies range in the concrete medium if using the reflected wave velocity and time interval curves merely, it remains to carry on deeper intensive study for the meticulous identification of the anomalous bodies’ type. In the prospective seismic wave examination research of the concrete medium anomalous bodies, we can increase the coefficient of utilization for frequency obtained, emphasize the spectrum analysis for the detection and recognition of the different types’ anomalous bodies inside the concrete medium, and focus on the quantitative analysis of anomalous bodies’ size.