›› 2009, Vol. 30 ›› Issue (11): 3548-3552.

• Testing Technology • Previous Articles    

Application of ultrasonic computerized tomography to diagnosis of pile construction integrity

ZHANG Yong-le1, 2，TANG De-gao1   

  1. 1. Engineering Institute of Engineering Corps, PLA Univ. of Sci. & Tech., Nanjing 210007, China; 2. Jianyuan Geotechnical and Surveying Institute Co.,Ltd, Jiangsu Province, Nanjing 210029, China
  • Received:2008-05-27 Online:2009-11-10 Published:2010-01-07

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Abstract:

The article tries to carry out the image reconstruction of pile body based on the principle of ray tracing with grid, and by using the method of ultrasonic tomography, which combines successive linearization iteration with least square QR decomposition with damping. According to test results of model piles with defects to be pre-set, ultrasonic tomography method is used to analyze the ultrasonic velocity and its characteristic impedance. The results show that the ultrasonic tomography method can be applied to the integrity testing of pile foundation, and to identify the position, shape and size of defects of pile body in the cast-in-place pile. Moreover, it can reach the higher precision. Especially, for analyzing the characteristic impedance, it can provide the exact data for the quantitative testing of integrity of pile foundation. Therefore, it will have higher application value in the integrity testing of pile foundation and geoengineering treatment of defects.

Key words: pile foundation, ultrasonic tomography, characteristic impedance, ray tracing

CLC Number: 

  • TU 443
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