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Proceedings Paper

Nondestructive testing of expansive soil by digital image method
Author(s): Wenwen Liu; Wei Wang; Renjun Xie; Xiaoyuan He
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Paper Abstract

A new digital image method for measuring soil landslide displacement is presented in this paper. First, the principle of surface fitting method to determine the sub-pixel gray value is introduced. Second, the optical experimental system and the specimen used in this experiment are described in detail. Then, the soil micro-displacement field can be measured by obtaining the clear image sequence of soil micro-slide of an expansive soil sample under water load and searching the gray value in sub-pixels by digital image surface fitting technology. The results show that through the optical system, this nondestructive testing method can improve the measurement accuracy, and has a very good prospect of application in the study of soil landslide. After getting a great deal of useful data, the principal of the displacement in different times and in different locations under different water load can be obtained by drawing displacement curves, consequently the experimentation can provide useful data for disaster prevention and mitigation research and actual construction. In addition, if using a CCD with higher resolution and more effective record area, or using synthetic aperture technology to increase effective record area, the accuracy of the experiment are expected to be further enhanced.

Paper Details

Date Published: 25 August 2009
PDF: 6 pages
Proc. SPIE 7375, ICEM 2008: International Conference on Experimental Mechanics 2008, 73753Q (25 August 2009); doi: 10.1117/12.839265
Show Author Affiliations
Wenwen Liu, Southeast Univ. (China)
Wei Wang, Southeast Univ. (China)
Renjun Xie, Nanjing Univ. of Aeronautics and Astronautics (China)
Xiaoyuan He, Southeast Univ. (China)

Published in SPIE Proceedings Vol. 7375:
ICEM 2008: International Conference on Experimental Mechanics 2008
Xiaoyuan He; Huimin Xie; YiLan Kang, Editor(s)

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