基于细观组分实际分布的花岗岩宏细观参数关系

doi:10.13722/j.cnki.jrme.2014.1448

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Abstract Rock is generally composed of various meso-compositions. The type and interaction between these compositions may affect the macro mechanical properties. Taking the Beishan granite as an example，the video images photographed during the laboratory test and the threshold segmentation technique were used to determine the actual types and locations of the various compositions. The particles and cements of the compositions were then assumed as disks and parallel bonds in simulation. The meso-scale mechanical properties were characterized with seven parameters，including the elasticity modulus，stiffness ratio and frictional coefficient of the particles，and the elasticity modulus，stiffness ratio，average normal and tangential strengths of parallel bonds. Macro-scale mechanical properties were characterized with three parameters，including the elasticity modulus，Poisson's ratio，and peak stress of the specimen. The particle flow code and the pixel and particle loops were combined to establish the particle flow model based on the actual compositions. Thirty-two orthogonal simulation tests were then conducted using the seven meso-mechanical parameters in a four level. The macro-meso mechanical relations and the adjustment method in calibrating the meso-mechanical parameters were thereafter proposed. It shows that the digital image processing techniques may be efficiently used to develop a particle flow model reflecting the actual distributions of the multi-compositions；there are good agreements between the elasticity modulus-modulus，Poisson's ratio-stiffness ratio，and peak stress-strength respectively in the macro- and meso-scales. A good correlation exists in the elasticity modulus-stiffness ratio-Poisson's ratio in the macro- and meso-scales. Because the distributions and mechanical features of the meso-compositions control the deformation/failure process，the results presented herein may provide references both in determining the meso-parameters and in estimating the macro parameters of rock materials.

Key words： rock mechanics granite actual distribution particle flow model relation between macro-meso parameters

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	Articles by authors
	XU Jinming1
	HUANG Dayong1
	2
	ZHU Hongchang1

Cite this article:

XU Jinming1,HUANG Dayong1,2, et al. Relations between macro- and meso-scopic mechanical parameters of granite based on actual distributions of mesocompositions[J]. , 2016, 35(S1): 2635-2643.

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https://rockmech.whrsm.ac.cn/EN/10.13722/j.cnki.jrme.2014.1448 OR https://rockmech.whrsm.ac.cn/EN/Y2016/V35/IS1/2635

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