Modeling Micro-crack Coalescence in Marble Containing a Single Flaw Under Uniaxial Compression

2018 ◽  
pp. 242-253
Author(s):  
Dan Huang ◽  
Xiao-qing Li
Keyword(s):  
Uniaxial Compression ◽  
Crack Coalescence ◽  
Single Flaw

scholarly journals Investigation on Crack Coalescence Behaviors for Granite Containing Two Flaws Induced by Cyclic Freeze-Thaw and Uniaxial Deformation in Beizhan Iron Mining, Xinjing, China

Geofluids ◽  
2020 ◽  
Vol 2020 ◽  
pp. 1-19 ◽  
Author(s):  
Y. Wang ◽  
C. H. Li
Keyword(s):  
Uniaxial Compression ◽  
Shear Failure ◽  
Ct Imaging ◽  
Crack Coalescence ◽  
Tensile Failure ◽  
Shear Cracks ◽  
Growth Trend ◽  
Rock Bridge ◽  
Freeze Thaw ◽  
Approach Angle

This work is aimed at investigating the effect of freeze-thaw (F-T) cycle on the crack coalescence behavior for granite samples containing two unparallel flaws under uniaxial compression. The flaw geometry in the samples was a combination of an upper inclined flaw with a horizontal flaw underneath. After the uniaxial compression experiments, macroscopic crack pattern description and the mesoscopic posttest CT imaging were used to reveal the effects of F-T cycle on the crack coalescence morphology at the rock bridge area. Results show that the stress–strain curves present a fluctuating growth trend and stress drop phenomenon becomes weaker with increasing F-T cycles. In addition, three different kinds of cracks (tensile-wing cracks, oblique shear cracks, and antiwing cracks) were observed, and the crack coalescence pattern was influenced by the F-T cycles and approach angle. A mix of tensile and shear failure occurs for the sample subjected to weak F-T treatment, and simple tensile failure occurs for the sample subjected to high F-T treatment. Moreover, CT imaging reveals a crack network pattern at the rock bridge area, and it is found that the fracture degree deceases with increasing F-T cycles and increases with the increasing approach angle. It suggests that the rock bridge area can be easily fractured for the sample subjected to high F-T cycles. Results of this study can provide theoretical foundation for the instability predication of fractured rock structures in cold regions.

scholarly journals Crack coalescence in rock-like specimens with two dissimilar layers and pre-existing double parallel joints under uniaxial compression

2021 ◽  
Vol 139 ◽  
pp. 104621
Author(s):  
Qibin Lin ◽  
Ping Cao ◽  
Guanping Wen ◽  
Jingjing Meng ◽  
Rihong Cao ◽  
...  
Keyword(s):  
Uniaxial Compression ◽  
Crack Coalescence

Numerical Study on Uniaxial Compression Failure of Brittle Material with a Single Flaw

2015 ◽  
Vol 1119 ◽  
pp. 683-687
Author(s):  
Jia Shen Tian ◽  
Cheng Zhao
Keyword(s):  
Uniaxial Compression ◽  
Numerical Study ◽  
Failure Process ◽  
Fracture Analysis ◽  
Two Dimensions ◽  
Analysis Software ◽  
Numerical Investigations ◽  
Compression Failure ◽  
Single Flaw ◽  
Good Agreement

Numerical investigations on failure process of rock-like materials with a single flaw were carried out under uniaxial compression based on the fracture analysis software: Fracture Analysis Code in Two Dimensions (FRANC2D/L). The change of the displacements and stress distribution were recorded around the crack. Comparative analysis is made among samples containing different angled flaw, which has great influnce on the process of crack initiation and propagetion, and with the increase of flaw angle from 30° to 75°, peak strength of the specimen increases linearly, basically. Which are in good agreement with those of experiments.

scholarly journals Study on the Interaction of Collinear Cracks and Wing Cracks and Cracking Behavior of Rock under Uniaxial Compression

2018 ◽  
Vol 2018 ◽  
pp. 1-10 ◽  
Author(s):  
Chaolin Wang ◽  
Yu Zhao ◽  
Yanlin Zhao ◽  
Wen Wan
Keyword(s):  
Uniaxial Compression ◽  
Inclination Angle ◽  
Shear Crack ◽  
Crack Coalescence ◽  
Crack Interaction ◽  
Shear Cracks ◽  
Collinear Cracks ◽  
Wing Crack ◽  
Cracking Behavior ◽  
Initiation And Propagation

This paper investigates the crack interaction, initiation, and propagation rules of rock-like materials containing two collinear cracks. Based on the Kachanov method, the formulations for stress intensity factors (SIFs) of two collinear cracks and two winged cracks are derived, respectively. The influences of bridge ligament and crack length on the crack interaction are analyzed theoretically. The results show that the propagation of a long crack is independent of crack interaction when d≥a2 and the same rule applies for a short crack when d≥a1. With the growth of wing cracks, the SIF of wings first remarkably decreases and then it tends toward a steady value. Subsequently, the propagation of collinear cracks and cracking processes under uniaxial compression are analyzed experimentally and numerically. Both the experimental results and simulation results demonstrate that shear cracks tend to initiate and propagate at higher inclination angle. The crack coalescence is affected by the inclination angle of bridge ligament. For increasing the inclination angle, the crack coalescence varies from wing crack failure to shear crack coalescence. As bridge ligament increases, the crack coalescence varies from shear crack coalescence to shear-wing crack coalescence and then to wing crack failure.

Sign in / Sign up

Export Citation Format

Share Document