北山花岗岩细观非均质性对单轴压缩力学特性影响的FDEM数值研究

doi:10.13722/j.cnki.jrme.2021.0284

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Abstract In order to study the influence of the meso-heterogeneity on the initiation，propagation and coalescence of microcracks in Beishan granite，three types of meso-structure characterization models(cluster uniform model，Voronoi grain model and cluster tessellation model) were constructed based the combined finite-discrete element method(FDEM)、digital image processing(DIP) and grain based model(GBM). Based on the three types of models，uniaxial compression tests were carried out to study the influence of heterogeneity on the mechanics characteristics，acoustic emission(AE) characteristics and grain-scale crack propagation law. The research results show that three types of models can capture the evolution from micro-damage to macro-failure，intergranular tension cracks were firstly generated，then intragranular cracks were generated，and the cracks were mainly tensile cracks. The meso-structure characterizations effect significantly crack initiation stress(CI) and crack damage stress (CD). The AE characteristics of Voronoi grain model and cluster tessellation model were more consistent with the laboratory tests than cluster uniform model. With the increase of hard mineral content，the uniaxial compressive strength(UCS)，elastic modulus，CI and CD increased，but Poisson?s ratio decreased. With the increase of grain size，UCS and CD decreased. With the increase of stiffness heterogeneity factor，UCS，CI and CD decreased.

Key words： rock mechanics granite heterogeneity the combined finite-discrete element method(FDEM) multiscale grain-based model digital image processing

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	Articles by authors
	ZHANG Shirui1
	2
	QIU Shili1
	2
	LI Shaojun1
	2
	LI Ping3
	WANG Xu1
	2
	HU Xunjian1
	2

Cite this article:

ZHANG Shirui1,2,QIU Shili1, et al. Study on mechanical properties of Beishan granite meso-heterogeneity under uniaxial compression with FDEM[J]. , 2022, 41(S1): 2658-2672.

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https://rockmech.whrsm.ac.cn/EN/10.13722/j.cnki.jrme.2021.0284 OR https://rockmech.whrsm.ac.cn/EN/Y2022/V41/IS1/2658

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