基于灰度方差统计的冰水堆积体细观建模与力学特性研究

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Abstract Based on digital image processing technology，a new method which can generate particle flow model from digital image is proposed to simulate mechanical behavior of outwash deposits. First of all，it implements preprocessing of digital image according to denoising method of images based on their decomposed bit planes. And then，Otsu is used to gain the adaptive threshold to accomplish the binarization of image so that soil and rock can be divided. Finally，it is the two dimensional particle flow code(PFC2D) compartment dislocation model of the real microstructure that can be built up by the proximate pixel interpolation algorithm. As an example，a outwash deposit case located at the front of Gushui hydropower station in Yunnan province is used，and the numerical simulation of biaxial compression tests are applied according to above-mentioned method. The results show that this new method overcomes the shortcomings of the axial compression compared with that builds up directly according to the position of pixel. The relationship between the stress and strain of outwash deposits has a feature of hardening under biaxial compression，and it also enhances the elastic modulus and peak strength because of the existing of rock mass. The increasing of bonding strength between soil particles has a greater impact on peak strength of the outwash deposits，while it isn′t obvious on initial elastic modulus. The outwash deposits meet Mohr-Coulomb strength theory approximately under low stresses. The angle of friction increases from 0°to 90°and the bonding strength also increases about 300 kPa compared with soil material excluding the impact of rock mass. Anyway，this method provides the basis of theory for the field outwash deposits in determination of parameters.

Key words： soil mechanics outwash deposits digital image processing(DIP) particle flow method compartment dislocation model micromechanical property

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	Articles by authors
	SHI Chong 1
	2
	WANG Shengnian 1
	2
	LIU Lin1
	2
	XU Anquan1
	2

Cite this article:

SHI Chong 1,2,WANG Shengnian 1, et al. MICROSCOPIC MODELING AND MECHANICAL PROPERTIES OF OUTWASH DEPOSITS BASED ON OTSU STATISTIC OF IMAGE GRAY[J]. , 2012, 31(S1): 2997-3005.

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https://rockmech.whrsm.ac.cn/EN/Y2012/V31/IS1/2997

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