Three dimensional high precision imaging method of Karst below large diameter pile
In Karst areas,large-diameter pile foundations are threatened by Karst below the pile,and traditional methods such as drilling and geophysical exploration are difficult to achieve three-dimensional fine detection of Karst below the pile bottom.This paper proposes a method for detecting Karst below the pile bottom based on ultrasonic imaging principle,using ultrasonic phased array sensor to collect full matrix data at the pile bottom,and using full focusing method to image Karst below the pile bottom.In order to solve the problem of low lateral resolution of ultrasonic far-field imaging,full matrix data are collected at multiple measurement points at the pile bottom,and multi-array synthetic aperture full focusing technique is used for far-field imaging,realizing large-range,large-depth and high-precision imaging below the pile bottom.A 1:1 full-scale physical model of pile foundation Karst was made and detection experiments were carried out,which confirmed the effectiveness of this method.The practicality of this method was verified by combining with engineering examples.The results show that this method can achieve three-dimensional high-precision imaging of Karst within 10 m depth below the pile bottom,with a detection resolution of 0.1 m.This method provides a new and effective detection technology and means for Karst below large-diameter pile bottom,which has important significance for ensuring the construction safety and quality control of pile foundation in Karst area.
Large diameter pileKarst detectionUltrasonic phase controlFar-field imagingHigh precision
万方数据
维普
