Temporal and Spatial Evolution of Non-Elastic Strain Accumulation in Stanstead Granite During Brittle Creep

Imani, Mehrdad; Walton, Gabriel; Moradian, Omid; Hedayat, Ahmadreza

doi:10.1007/s00603-024-04170-4

Temporal and Spatial Evolution of Non-Elastic Strain Accumulation in Stanstead Granite During Brittle Creep

Journal Article · Thu Sep 26 00:00:00 EDT 2024 · Rock Mechanics and Rock Engineering

DOI:https://doi.org/10.1007/s00603-024-04170-4· OSTI ID:2465111

^[1]; Walton, Gabriel ^[2]; Moradian, Omid ^[3]; Hedayat, Ahmadreza ^[2]

Colorado School of Mines, Golden, CO (United States); Colorado School of Mines
Colorado School of Mines, Golden, CO (United States)
Colorado School of Mines, Golden, CO (United States); New Mexico Institute of Mining and Technology, Socorro, NM (United States)

Understanding the long-term behavior of brittle rocks requires fundamental consideration of time-dependent strain evolution and brittle creep processes. Previous studies have evaluated sub-critical crack growth during time-dependent deformation and damage evolution in brittle rocks; however, there is an incomplete knowledge of how damage evolves spatially and temporally within the body of intact rocks, where distributed regions of damage interact and coalesce during creep. This paper presents laboratory research focusing on evaluating brittle creep damage processes in Stanstead granite (SG) using 2-dimensional digital image correlation (2D-DIC). In the laboratory, the prismatic SG specimens were loaded beyond an estimated Crack Damage stress threshold (CD) level and then maintained a constant stress to initiate the creep process. DIC was used to characterize full-field spatiotemporal strain evolution, which was then interpreted in the context of local regions of “damage”, determined according to a strain-based criterion. Here, a method was proposed for identifying “existing” and “new” damage regions over specified intervals during the test, followed by spatial clustering of these regions to assess their spatiotemporal evolution. The clustering analysis results demonstrated the extension of existing damage regions was the main damage process during brittle creep, which is consistent with existing models of sub-critical crack growth. In addition, temporal analysis of tensile and shear strains on a point-by-point basis revealed both new damage formation and the strain concentration within existing damaged regions significantly contribute to overall specimen strain during primary creep. In contrast, during secondary creep, increases in specimen deformation are influenced by the accumulation of strains within already damaged regions.

View Accepted Manuscript (DOE)

Research Organization:: Colorado School of Mines, Golden, CO (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES)

Grant/Contract Number:: SC0019117

OSTI ID:: 2465111

Journal Information:: Rock Mechanics and Rock Engineering, Journal Name: Rock Mechanics and Rock Engineering Vol. 58; ISSN 0723-2632

Publisher:: SpringerCopyright Statement

Country of Publication:: United States

Language:: English

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58 GEOSCIENCES
Brittle creep
Spatiotemporal strain evolution
Stanstead granite
Sub-critical crack growth
Time-dependent behavior

Temporal and Spatial Evolution of Non-Elastic Strain Accumulation in Stanstead Granite During Brittle Creep

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