Jiunnren Lai*, Shu-Tzu Yang, and Tzyy-Shiou Chang

Department of Construction Engineering, Chaoyang University of Technology, Wufeng District, Taichung, Taiwan

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ABSTRACT

In recent years, failures of several earth retaining structures caused severe damage in property and loss of life in Taiwan. Therefore, evaluating the safety condition of existing earth retaining structures becomes an important task for the civil engineers. The objective of this research is to investigate the feasibility of applying Sonic Echo non-destructive testing technique for the evaluation of the height of existing cantilever earth retaining structures.  Numerical modeling was performed to study the 3-dimensional (3D) effects on the measured signal.  Field tests were also performed on two earth retaining walls to verify the correctness of numerical modeling. Results of this study indicate that, in comparison to 1-dimensional structure such as piles, 3D effects reduce the intensity of signal reflected from the bottom of the structure, thus increase difficulty in determining the arrival time of the reflected wave.  However, the error resulting from these 3D effects is less than 10%.  Therefore, it is concluded that the sonic echo method is a promising technique for the evaluation of the height of existing earth retaining structures.


Keywords: Diacetone alcohol; refractive indices; surface tension.


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REFERENCES

  1. [1] Baker, C.N. Jr., Drumright, E.E., Mensah, F.D., Parikh, G., and Ealy, C.D. 1991. Integrity Testing of Foundations. Transportation Research Record, 1331: 28-35.

  2. [2] Likins, G. and Rausche, F. 2000. Recent Advances and Proper Use of PDI Low Strain Pile Integrity Testing. Proceedings of the Sixth International Conference on the Application of Stress Wave Theory to Piles, S. Niyama and J. Beim Editors, A.A. Balkema, 211-218.

  3. [3] Rix, J.R., Jacobs, L.J., and Reichert, C.D. 1993. Evaluation of Nondestructive Test Methods for Length, Diameter, and Stiffness Measurements on Drilled Shafts, Field Performance of Structure and Nondestructive Evaluation of Subsurface Infrastructure. Transp- ortation Research Record, 1415: 69-77.

  4. [4] Finno, R.J. and Gassman S. L. 1998. Impulse   Response Evaluation of Drilled Shafts. Journal of Geotechnical and Geoenviromental Engineering, ASCE, 124, 10: 965-975.

  5. [5] Lai, J., Yu, C.P., and Liao, S.T. 2006.Assessment of the Integrity of Piles by Impedance Log Technique. Key Engineering Material, 321-323: 340-343.

  6. [6] ASTM, 2000. Standard Test Method for Low Strain Integrity Testing of Pile. Annual Book of ASTM Standards D-5882, Vol. 04.09.


ARTICLE INFORMATION

Received: 2012-01-18
Revised: 2012-06-02
Accepted: 2012-06-05
Available Online: 2020-12-10


Cite this article:

Lai, J., Yang, S.-T., Chang, T.-S. 2012. Evaluating the height of cantilever earth retaining walls by sonic echo non-destructive testing method. International Journal of Applied Science and Engineering, 10, 145–154. https://doi.org/10.6703/IJASE.2012.10(2).145

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