Reliability analysis of ultrasonic wave in bored cast in-situ pile of railway

In this paper,the fundamental theory of crosshole sonic logging is summarized,and the relations between acoustic parameters and the concrete quality are introduced.Compared with low strain wave-reflecting method,cross-hole sonic logging have higher reliability for bored cast in-situ pile of railway,especially for large-diameter bored pile.Combined with example,effectiveness of this method has been analyzed and verified.