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Abstract Based on the wavelet transform and Gamma correction，a new digital image processing technology (DIPT) is proposed. Then it is applied to the discrete element simulation of talus deposit；the numerical model can be established fast and correctly. As for the technology，the two-dimensional wavelet theory is used for the denoising of digital image，then the adaptive Gamma correction method is adopted to eliminate the impact of different lights and environments，and finally，the color space is conversed for the binary treatment. Based on the study of DIPT，a Wavelet-Gamma-Conversion(WGC) auto-modeling program is developed. It is able to realize the whole process：acquiring the information，analyzing and processing，establishing the micro-model files. A new modeling method is developed for the mechanical behavior simulation of talus deposit. As an example，some talus deposit data of Gushui hydropower station is used；and then the micromodel is established by the WGC from the digital photo on-site. The mechanical properties are studied by the numerical simulation of biaxial compression test. The results show that the gravels and soil mass compress with each other to form a corporate load-carrying body for sharing the external forces. The stress-strain curves show a strain-hardening stage evidently due to the impact of gravels. With the increasing of bond strength between soil particles，the initial elastic modulus and peak strength of talus deposit go up at a certain level. The law of the numerical simulation test is in agreement well with the results of laboratory test.
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Received: 22 December 2010
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2011, Vol. 30 
