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	Effect of heterogeneity of brittle rock on micromechanical extensile behavior during compression loading
	Lan H. X. ; Martin C. D. ; Hu B.
	2010
关键词	westerly granite grain-size propagation thresholds statistical techniques fracture-toughness surface energies particle model failure microcracks deformation
英文摘要	A grain-based Universal Distinct Element Code model was developed to generate a deformable polygonal grain-like structure to simulate the microstructure of brittle rock. It takes into account grain-scale heterogeneity including microgeometric heterogeneity, grain-scale elastic heterogeneity, and microcontact heterogeneity. The microgeometric heterogeneity can be used to match the grain size distribution of the rock. The discrete element approach is able to simulate the microheterogeneity caused by elastic variation and contact stiffness anisotropy. The modeling approach was evaluated using Lac du Bonnet granite and A "Aspo" Diorite. The microheterogeneity played an important role in controlling both the micromechanical behavior and the macroscopic response when subjected to uniaxial compression loading. The crack-initiation stress was found to be controlled primarily by the microscale geometric heterogeneity, while the microcontact heterogeneity controlled the strength characteristics. The effect of heterogeneity on the distribution and evolution of tensile stresses and associated extension cracks was also examined.
出处	Journal of Geophysical Research-Solid Earth
卷	115
收录类别	SCI
ISSN号	0148-0227
内容类型	SCI/SSCI论文
源URL	[http://ir.igsnrr.ac.cn/handle/311030/23706]
专题	地理科学与资源研究所_历年回溯文献
推荐引用方式 GB/T 7714	Lan H. X.,Martin C. D.,Hu B.. Effect of heterogeneity of brittle rock on micromechanical extensile behavior during compression loading. 2010.

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