数字岩芯微观结构特征及其对岩石力学性能的影响研究

doi:10.13722/j.cnki.jrme.2017.1122

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Abstract Rock is essentially a kind of heterogeneous material and its mechanical properties are controlled by pore microstructures. In this paper，the fractal dimensions，pore size distributions and shape factor distributions of micro-CT images of different rocks were calculated using the image morphology algorithms. With the REV of digital images，the deformation simulation experiments were performed using FEM and the effects of microstructures on rock deformation were investigated. The results show that the pore size distributions differ significantly among these rocks of which both skeletons and pores have fractal characteristics，and the round pores account for little. Due to the restraint on the two ends of rock sample under uniaxial loading，rock failure does not firstly emerge at the sample end，but at the middle of rock sample where an X-shaped conjugated plastic shear zone emerges，and it develops continuously until the rock sample is destroyed. The highly uneven distribution of plastic deformation zones and the distinctly internal stress concentration occur due to the irregular pores. Along the loading direction，rock has a distinct displacement mode with large lateral deformation，and the displacement gradients of transition regions of the deformed belts are quite large. An arc-shaped elastic deformation zone below the X-shaped shear zone is produced. The effective elastic modulus of rock has a good correlation with the porosity and fractal dimension. With the increasing of porosity，the effective modulus decreases almost exponentially，indicating that porosity has a remarkable influence on the mechanical properties of rock. The larger the pore fractal dimension is，the smaller the elastic modulus.

Key words： rock mechanics digital core pore microstructure microdeformation effective modulus

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	Articles by authors
	CHENG Zhilin1
	2
	SUI Weibo3
	NING Zhengfu1
	2
	GAO Yanfang3
	HOU Yanan3
	CHANG Chunhui3
	LI Junjian1
	2

Cite this article:

CHENG Zhilin1,2,SUI Weibo3, et al. Microstructure characteristics and its effects on mechanical properties of digital core[J]. , 2018, 37(2): 449-460.

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http://www.rockmech.org/EN/10.13722/j.cnki.jrme.2017.1122 OR http://www.rockmech.org/EN/Y2018/V37/I2/449

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