Ultrasonic Transmission Method Of Pile Testing Signal Processing Based On Wavelet Analysis

Pile foundation is a time-honored and get the extensive use of deep foundation forms. These years,as China's modernization of booming development, engineering construction,the constant expansion of modern science and technology unceasing development,the type of pile foundation and the bearing capacity of pile with craft, pile foundation completeness inspection,pile foundation design theory and calculation methods had the very big development. Usually in underground or pile foundation, cannot intuitionistic its quality underwater,belong to take cover engineering, its construction program numerous , high technical requirements and difficult construction,construction process a link processes improper,may have formed the non-reducing defects (pile diameter expanding,segregation,broken pile),defects exist will affect the performance of easy pile quality problems arise,and pile foundation quality directly related to the safety of the whole building. Therefore,pile foundation engineering test and quality inspection particularly important,before the design, construction and after construction will make necessary test and inspection. And accurate judgement of the pile foundation of defect pile defects nature and more precise positioning,also be the main direction of our study.At present, the pile of pile foundation quality testing are mainly used more static load method, the dynamic measurement method (height strain) and ultrasonic transmission method. According to this need, use the modern testing technology and the corresponding mathematical tools, software, mainly in ultrasonic transmission method to detect the concrete pile quality assessment, study, only do some other methods were presented.Based on the testing technology and modern concrete quality of ultrasonic mathematical tool,each acoustic parameters on the foundation pile of concrete quality defects judge do if the theoretical analysis. According to the acoustics theory, theoretically proved respectively each acoustic parameters (wave velocity,frequency and amplitude of concrete quality judgement) contribution. In order to fully grasp the concrete quality yankees pile in the laboratory,the concrete defects simulation experiment wavelet analysis theory,combined with MATLAB software applications to the pile of concrete quality test and evaluation to the current base pile concrete quality judgment standard of probability method made a effective supplement.