气候变化领域集成服务门户(CCPortal): Investigation of the Micromechanical Damage Process in a Granitic Rock Using an Inelastic Bonded Block Model (BBM)

CCPortal

DOI	10.1029/2019JB018844
	Investigation of the Micromechanical Damage Process in a Granitic Rock Using an Inelastic Bonded Block Model (BBM)
	Sinha S.; Shirole D.; Walton G.
发表日期	2020
ISSN	21699313
卷号	125 期号:3
英文摘要	This study numerically investigates the damage process in a granite using an inelastic multiminerallic block model in two-dimensional Universal Distinct Element Code. In addition to the commonly considered calibration targets like uniaxial and triaxial strengths, tensile strength, and Young's modulus, attention was paid to reproduce additional attributes such as postpeak response, residual strengths, and confinement-dependent dilatancy to minimize the nonuniqueness potential of the models. The fracture pattern transitioned from axial cracking to shear banding as the specimen confinement was increased from 0 to 60 MPa. Most notably, the model could exhibit the cohesion-weakening-frictional-strengthening behavior that is typically associated with brittle rocks. The progressive damage mechanism in the unconfined bonded block model (BBM) was subsequently studied using the 2-D digital image correlation (2-D-DIC) approach. To date, the application of the 2-D-DIC approach has been restricted only to real material testing; this study, therefore, is an attempt to extend its applicability to numerical models. It was found that 2-D-DIC is capable of imaging the simulated microcracking process very well and the results were similar to those observed from real testing on a different granitic rock. Lastly, the numerical-based DIC results were analyzed to clarify that even if the point of axial stress-axial strain nonlinearity does not coincide with the point of volumetric strain reversal in unconfined BBMs, the axial stress-axial strain nonlinearity approach should always be used for determining the crack damage threshold in BBMs. ©2020. American Geophysical Union. All Rights Reserved.
英文关键词	bonded block model; digital image correlation; rock fracture; Voronoi Tessellation
语种	英语
来源期刊	Journal of Geophysical Research: Solid Earth
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/187891
作者单位	Department of Geology and Geological Engineering, Colorado School of Mines, Golden, CO, United States; Department of Civil and Environmental Engineering, Colorado School of Mines, Golden, CO, United States
推荐引用方式 GB/T 7714	Sinha S.,Shirole D.,Walton G.. Investigation of the Micromechanical Damage Process in a Granitic Rock Using an Inelastic Bonded Block Model (BBM)[J],2020,125(3).
APA	Sinha S.,Shirole D.,&Walton G..(2020).Investigation of the Micromechanical Damage Process in a Granitic Rock Using an Inelastic Bonded Block Model (BBM).Journal of Geophysical Research: Solid Earth,125(3).
MLA	Sinha S.,et al."Investigation of the Micromechanical Damage Process in a Granitic Rock Using an Inelastic Bonded Block Model (BBM)".Journal of Geophysical Research: Solid Earth 125.3(2020).