基于GB-DDA方法的岩石细观非均质性对其压缩力学特性影响研究

doi:10.3724/1000-6915.jrme.2024.0919

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Abstract Discontinuous deformation analysis (DDA) is an implicit discrete element method used to simulate the deformation of discrete block systems. To investigate the influence of mineral grains on the initiation, propagation, and coalescence of microcracks during rock loading, a Voronoi mineral grain model (GB-DDA) that adheres to statistical laws was established based on the DDA method. Compared to laboratory experiments, the GB-DDA, calibrated by meso parameters, can accurately simulate the mechanical response of Barre granite under tension and compression, enabling the quantitative analysis of intragranular and intergranular damage evolution processes. Using quasi-static uniaxial compression experiments, several GB-DDA numerical models with varying average grain sizes, grain roundness, and mineral content were developed to study the influence of mesoscopic heterogeneity on the compressive mechanical properties of Barre granite. Research findings indicate that during quasi-static uniaxial compression, the number of cracks in the numerical Barre granite samples, generated by different factors, follows the order: intergranular tensile cracks, transgranular tensile cracks, intergranular shear cracks, and transgranular shear cracks. The uniaxial compressive strength, elastic modulus, and Poisson's ratio of the rock are significantly affected by average grain size, grain roundness, and mineral content. An increase in average grain size and grain roundness promotes the initiation of shear cracks but has little effect on intergranular and transgranular cracks. Additionally, an increase in biotite content promotes the generation of intergranular cracks but has minimal impact on tensile and shear cracks.

Key words： rock mechanics discontinuous deformation analysis mesoscopic heterogeneity grain model rock failure granite

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	Articles by authors
	GAO Shanhua1
	2
	ZHANG Kaiyu1
	2
	3
	YANG Mei1
	2
	LIU Feng4
	ZHU Kanyuan5

Cite this article:

GAO Shanhua1,2,ZHANG Kaiyu1, et al. Study on the effect of rock mesoscopic heterogeneity on its compressive mechanical properties based on GB-DDA method[J]. , 2025, 44(6): 1612-1623.

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https://rockmech.whrsm.ac.cn/EN/10.3724/1000-6915.jrme.2024.0919 OR https://rockmech.whrsm.ac.cn/EN/Y2025/V44/I6/1612

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[32]	LI L，LEE P K K，TSUI Y，et al. Failure process of granite[J]. International Journal of Geomechanics，2003，3(1)：84-98.
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[34]	ZHOU J，ZHANG L Q，YANG D X，et al. Investigation of the quasi-brittle failure of Alashan granite viewed from laboratory experiments and grain-based discrete element modeling[J]. Materials，2017，10(7)：835.
[35]	PENG J，WONG L N Y，TEH C I. Influence of grain size on strength of polymineralic crystalline rock：New insights from DEM grain-based modeling[J]. Journal of Rock Mechanics and Geotechnical Engineering，2021，13(4)：755-766.
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[37]	PAN C，ZHAO G M，MENG X R，et al. Numerical investigation of the influence of mineral mesostructure on quasi-static compressive behaviors of granite using a breakable grain-based model[J]. Frontiers in Ecology and Evolution，2023，11：1288870.
[38]	YESILOGLU-GULTEKIN N，SEZER E A，GOKCEOGLU C，et al. An application of adaptive neuro fuzzy inference system for estimating the uniaxial compressive strength of certain granitic rocks from their mineral contents[J]. Expert Systems with Applications，2013，40(3)：921-928.
[39]	SAJID M，ARIF M. Reliance of physico-mechanical properties on petrographic characteristics：consequences from the study of Utla granites，north-west Pakistan[J]. Bulletin of Engineering Geology and the Environment，2015，74(4)：1 321-1 330.