NDLI: Investigation on Mechanical Behaviors of Sandstone with Two Preexisting Flaws under Triaxial Compression

Content Provider	Springer Nature Link
Author	Huang, Da Gu, Dongming Yang, Chao Huang, Runqiu Fu, Guoyang
Copyright Year	2015
Abstract	Triaxial compression experiments on sandstone samples with two preexisting closed non-overlapping flaws were performed to investigate the deformation and strength behaviors. Three types of preexisting closed flaw pair in sandstone samples, i.e., parallel low-dip (type B), parallel high-dip (type C), and composite high- and low-dip (type D), were considered as the typical arrangements of the non-overlapping crack pair. A general rule has been found that the arrangement of the flaw pair has greater impact on the rock deformation, strength, and crack coalescence pattern than the confining pressure (5–20 MPa). Experimental results showed that, compared with intact sandstone samples, the postpeak stress–strain curves of flawed samples distinctly demonstrate stress fluctuation. In particular, the unique prepeak stress–strain curves of the specimens with a low-dip flaw pair (type B) present oblique Z-shape with a double-peak stress. The stress for crack initiation σ ci, the critical stress of dilation σ cd, and the peak strength σ c of precracked sandstone samples are significantly lower than those of intact rock. The present numerical study, which is an extension of the test analysis, focuses on identifying the crack nature (tensile or shear) and coalescence process. These simulated crack coalescence patterns are in good agreement with the laboratory test results. The cracks of the precracked samples that contained flaws with small inclination angle (associated with either type B or type D) generally initiate at the inner flaw tips and eventually lead to simple direct shear coalescence. However, complex indirect shear coalescence appears in the model containing a steep preexisting flaw pair (associated with type B specimen), even though no coalescence occurs when σ 3 = 5 MPa.
Starting Page	375
Ending Page	399
Page Count	25
File Format	PDF
ISSN	07232632
Journal	Rock Mechanics and Rock Engineering
Volume Number	49
Issue Number	2
e-ISSN	1434453X
Language	English
Publisher	Springer Vienna
Publisher Date	2015-04-29
Publisher Place	Vienna
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Sandstone Preexisting closed flaws Stress–strain Strength Crack coalescence Triaxial compression AUTODYN Geophysics/Geodesy Civil Engineering
Content Type	Text
Resource Type	Article
Subject	Geology Geotechnical Engineering and Engineering Geology Civil and Structural Engineering

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