基于晶粒织构模型的花岗岩矿物晶粒形状及朝向对其力学特性影响研究

doi:10.13722/j.cnki.jrme.2022.1300

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Abstract Granite and other crystalline rocks exhibit heterogeneous properties such as discontinuity and anisotropy due to the microstructure such as mineral shape，mineral orientation and mineral composition. However，existing numerical methods are not able to quantitatively study the influence of mineral grain shape and orientation. In this paper，in order to investigate the influence of inhomogeneities such as shape and orientation of mineral grains on rock properties，the grain texture model(GTM) based on the particle discrete element method is proposed，GTM can investigate the influence of mineral grain shape and orientation and study the evolution of intra- and inter-grain crack of minerals by generating a random irregular shaped Cluster representing real mineral grains. By comparing with the results of experimental tests，the GTM can mimic the macroscopic mechanical properties and failure mode of LdB granite under different mechanical conditions with good agreement after the calibration of micro-parameters. By modeling GTM with various grain aspect ratios and rotation angles to investigate the influence of mineral grain shape and orientation，it is found that the change of grain shape and orientation will lead to the change of intra- and inter-grain contact ratios and orientations，which in turn affects the macroscopic mechanical properties and failure mode of the rock. The GTM can study the mechanical properties and failure mechanism of rocks more comprehensively from the perspective of microstructure of rocks，which provides an effective method to reveal the influence of heterogeneous properties on the macroscopic mechanical properties and intra- and inter-grain crack propagation.

Key words： rock mechanics granite grain texture model grain shape grain orientation mechanical properties

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	Articles by authors
	WANG Suifeng1
	ZHAO Xianyu1
	ZHANG Liping1
	CUI Zhen2
	WANG Tao1

Cite this article:

WANG Suifeng1,ZHAO Xianyu1,ZHANG Liping1, et al. Influence of grain shape and orientation of granite on mechanical property#br# based on the grain texture model[J]. , 2023, 42(10): 2515-2527.

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https://rockmech.whrsm.ac.cn/EN/10.13722/j.cnki.jrme.2022.1300 OR https://rockmech.whrsm.ac.cn/EN/Y2023/V42/I10/2515

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