Journal ArticleDOI
Mechanical behavior and failure analysis of brittle sandstone specimens containing combined flaws under uniaxial compression
TLDR
Based on the axial stress-axial strain curves, the effect of fissure angle on the strength and deformation behavior of sandstone specimens containing combined flaws is analyzed in this paper.Abstract:
Based on the axial stress-axial strain curves, the effect of fissure angle on the strength and deformation behavior of sandstone specimens containing combined flaws is analyzed. The mechanical parameters of sandstone specimens containing combined flaws are all lower than that of intact specimen, but the reduction extent is distinctly related to the fissure angle. The results of sandstone specimens containing combined flaws are obtained by the acoustic emission, which can be used to monitor the crack initiation and propagation. The ultimate failure mode and crack coalescence behavior are evaluated for brittle sandstone specimens containing combined flaws. Nine different crack types are identified on the basis of their geometry and crack coalescence mechanism (tensile crack, hole collapse, far-field crack and surface spalling) for combined flaws. The photographic monitoring was also adopted for uniaxial compression test in order to confirm the sequence of crack coalescence in brittle sandstone specimens containing combined flaws, which recorded the real-time crack coalescence process during entire deformation. According to the monitored results, the effect of crack coalescence process on the strength and deformation behavior is investigated based on a detailed analysis for brittle sandstone specimens containing combined flaws by using digital photogrammetry.read more
Citations
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Modeling rock specimens through 3D printing: Tentative experiments and prospects
TL;DR: In this article, the serviceability of 3D-printing products as substitutes for rock specimens and rock-type materials in experimental analysis of deformation and failure in the laboratory is investigated.
Journal ArticleDOI
Cracking Process and Stress Field Evolution in Specimen Containing Combined Flaw Under Uniaxial Compression
TL;DR: Wang et al. as discussed by the authors investigated the relationship among the mechanical properties, flaw parameters, and crack propagation patterns of coal after hydraulic slotting and found that the crack propagation pattern is quantitatively described by the fractal dimension, which is inversely proportional to the uniaxial compressive strength and elastic modulus of the specimen.
Journal ArticleDOI
Experimental study on the strength and fracture mechanism of sandstone containing elliptical holes and fissures under uniaxial compression
TL;DR: A series of uniaxial compression tests on sandstone specimens containing elliptical holes and fissures were carried out using acoustic emission (AE) monitoring and digital image correlation (DIC) system.
Journal ArticleDOI
Physical Model Test on the Deformation Behavior of an Underground Tunnel Under Blasting Disturbance
TL;DR: In this article, a physical model test is carried out to simulate the blasting disturbance on the underground tunnel, including four blasting events with different blasting locations, where two blasting angles and two blasting distances are designed.
Journal ArticleDOI
Effects of size and strain rate on the mechanical behaviors of rock specimens under uniaxial compression
TL;DR: In this article, the effects of size and strain rate on measured rocks were tested at six different strain rates under uniaxial compression using the MTS 815 Rock Mechanics Test System.
References
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Compression-induced nonplanar crack extension with application to splitting, exfoliation, and rockburst
Sia Nemat-Nasser,H. Horii +1 more
TL;DR: In this article, the authors analyzed the growth process of a pre-existing straight crack, induced by overall far-field compression, and quantified various parameters which characterize its growth process, including the rate of increase of the length of the extended portion with respect to increasing axial compression.
Journal ArticleDOI
Systematic evaluation of cracking behavior in specimens containing single flaws under uniaxial compression
TL;DR: In this paper, the results of an experimental study in which molded gypsum and Carrara marble specimens containing a pre-existing flaw were tested in uniaxial compression were presented.
Journal ArticleDOI
Crack coalescence in a rock-like material containing two cracks
Robina H.C. Wong,Kam Tim Chau +1 more
TL;DR: In this paper, the authors investigated the pattern of crack coalescence and strength of a sandstone-like material containing two parallel inclined frictional cracks under uniaxial compression, with changing values of inclination of preexisting cracks α, bridge angle β (inclination between the inner tips of the two existing cracks), and the frictional coefficient μ on the surfaces of the preexexisting cracks.
Journal ArticleDOI
Crack coalescence in specimens with open and closed flaws: A comparison
C.H. Park,Antonio Bobet +1 more
TL;DR: In this article, a comparison between experimental observations made from gypsum specimens loaded in uniaxial compression, with open and closed flaws, is presented, and a unified conceptual framework and a common terminology for fracturing phenomena in brittle materials with open or with frictional pre-existing discontinuities.
Journal ArticleDOI
Strength failure and crack coalescence behavior of brittle sandstone samples containing a single fissure under uniaxial compression
Sheng-Qi Yang,Hong-Wen Jing +1 more
TL;DR: In this article, the influence of single fissure geometry on the strength and deformation behavior of brittle sandstone samples is analyzed in detail based on the experimental results of axial stress-axial strain curves.
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