Nondestructive testing of expansive soil by digital image method

Wenwen Liu; Wei Wang; Renjun Xie; Xiaoyuan He

doi:10.1117/12.839265

25 August 2009 Nondestructive testing of expansive soil by digital image method

Wenwen Liu, Wei Wang, Renjun Xie, Xiaoyuan He

Proceedings Volume 7375, ICEM 2008: International Conference on Experimental Mechanics 2008; 73753Q (2009) https://doi.org/10.1117/12.839265
Event: International Conference on Experimental Mechanics 2008 and Seventh Asian Conference on Experimental Mechanics, 2008, Nanjing, China

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.

Citation Download Citation

Wenwen Liu, Wei Wang, Renjun Xie, and Xiaoyuan He "Nondestructive testing of expansive soil by digital image method", Proc. SPIE 7375, ICEM 2008: International Conference on Experimental Mechanics 2008, 73753Q (25 August 2009); https://doi.org/10.1117/12.839265

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KEYWORDS

Digital imaging

Soil science

Landslide (networking)

Image processing

CCD cameras

Nondestructive evaluation

Charge-coupled devices

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