Fracture Characteristics of Sliding Crack in Brittle Rock: Analysis Based on an Improved Equivalent Crack Model
نویسندگان
چکیده
Under low confinement axial compression, the failure of brittle rock is mainly caused by tensile fracture. Many scholars adopt sliding crack as an idealized model to present intrinsic mechanism but due complex configuration crack, its stress intensity factor (SIF) calculation has always been a difficult problem. In this study, improved proposed; in context linear elastic fracture mechanics (LEFM) and weight function method, expression derived. The propagation manners under loading lateral unloading conditions have further analyzed. extended finite element method (XFEM) employed verify correctness theoretical SIF formulation inferences. formula shows that highly sensitive change stress, which theoretically explains compressive characteristics follows: 1) condition increasing very strong no-linear impact on strength rock; 2) unloading, destruction more abrupt ferocious than case. order confirm micro-fractures rocks are notably influenced confining pressure, former analysis predicted, tri-axial compression test combined with acoustic emission monitoring technique conducted basalt samples. According waveform parameter it pressure will greatly reduce proportion tension-type fractures, indirectly proves hypothesis analysis.
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ژورنال
عنوان ژورنال: Frontiers in Earth Science
سال: 2022
ISSN: ['2296-6463']
DOI: https://doi.org/10.3389/feart.2022.893549