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Into some years , the rapid development of various types of ultrasonic testing techniques , especially as the elastic wave one of the testing methods , the development of the acoustic transmission method . The theory of propagation of elastic wave propagation through the solid medium is the theoretical basis of the acoustic transmission method . The basic principle of sound wave transmission method : by the transmitting transducer, such as solid concrete medium transmitting ultrasonic , after modulation of the physical characteristics of ultrasonic wave propagation in concrete , and then by ultrasonic receiver transducer receives , through the recording and analysis of ultrasonic acoustic the parameters wave velocity , amplitude, frequency, etc. , to solve many problems in engineering . Sonic transmission method is a relatively mature technology , but the pile foundation criteria there are still some problems, the need for further research . To detect the practice and engineering examples as the basis to sort out a lot of testing data , statistics, analysis and research , the pile foundation discrimination method to carry out the research : current criterion methods can not quantify the pile quality analysis of pile defects is difficult for further qualitative analysis In view of the above problems , specific examples of projects pile testing work , a comprehensive analysis of various acoustic parameters affecting pile quality , a new quality The discriminant method - relative Strength Index . The design of the Relative Strength Index , sound , sound velocity , amplitude , frequency and algorithm Matlab language on the relative strength index , to more accurately reflect the strength and stability of the concrete pile quality . Combination of the pile testing the engineering examples , the use of the new Criterion law - Relative Strength Indicator Approach analysis was seized piles , the results of the analysis are compared with the previous criterion method , does have its advantages ; -depth analysis of the ultrasonic transmission Method pile foundation strength and integrity of the basic principles and affect the acoustic parameters of the pile of concrete quality sound , sound velocity, amplitude depth analysis ; acoustic transmission method of pile testing , acoustic tube tilt will cause ranging changes ranging close ties with the acoustic parameters of sound , thus affecting the judgment of the quality of the concrete , this article with engineering examples , the acoustic tube bending problem analysis and summary .
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