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Keywords: initiation
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Proceedings Papers

Paper presented at the ISRM Regional Symposium - 11th Asian Rock Mechanics Symposium, October 21–25, 2021
Paper Number: ISRM-ARMS11-2021-310
... that the spalling strength in low-porosity rocks can be associated with the initiation of internal cracks in the sample. However, very limited studies are available that looks at the effect of all the principal stresses on rock crack initiation stress threshold. This paper investigates the previously ignored effect...
Proceedings Papers

Paper presented at the ISRM Regional Symposium - 11th Asian Rock Mechanics Symposium, October 21–25, 2021
Paper Number: ISRM-ARMS11-2021-410
... conducted and a high-speed camera was employed to capture the cracking behaviour. With the experimental-numerical method, the dynamic initial stress intensity factors KI and KII were calculated by the finite element method. The AUTODYN was applied to study mixed-mode crack propagation numerically...
Proceedings Papers

Paper presented at the ISRM Regional Symposium - 11th Asian Rock Mechanics Symposium, October 21–25, 2021
Paper Number: ISRM-ARMS11-2021-032
... and evolution of two types of cracks on rocks. The macroscopic damage variable expressed by the stress intensity factor was derived on the basis of damage mechanics and fracture mechanics and regarded as a piecewise function with initiation stress as the dividing point. The rock was divided into two parts based...
Proceedings Papers

Paper presented at the ISRM Regional Symposium - 11th Asian Rock Mechanics Symposium, October 21–25, 2021
Paper Number: ISRM-ARMS11-2021-630
... geology geological subdiscipline initiation contour geologist reservoir characterization conference blasthole society iop publishing iop conf environmental science 861 diameter university lateral initiation journal modeling & simulation vibration experiment boundary...
Proceedings Papers

Paper presented at the ISRM Regional Symposium - 11th Asian Rock Mechanics Symposium, October 21–25, 2021
Paper Number: ISRM-ARMS11-2021-060
... of 5 m and depth of 400 m in the slope. The bedding fault was the groundwater channel in the slope with saturated rock mass, according to the latest survey. To reveal the initiation mechanism of Daguangbao landslide (hereinafter short for DGB landslide) related to groundwater, a kind of simplified...
Proceedings Papers

Paper presented at the ISRM Regional Symposium - 11th Asian Rock Mechanics Symposium, October 21–25, 2021
Paper Number: ISRM-ARMS11-2021-090
... geomechanics geologist rock type geological subdiscipline gneiss figure 2 development environmental science 861 initiation propagation society iop publishing iop conf strength initiator interaction nrc conference applicability simulation 11th Conference of Asian Rock Mechanics Society IOP...
Proceedings Papers

Paper presented at the ISRM Regional Symposium - 11th Asian Rock Mechanics Symposium, October 21–25, 2021
Paper Number: ISRM-ARMS11-2021-136
... time were measured by uniaxial compression test, and then, the shear box tests with loading angles of 0°, 15°, 30°, 45°, 60°, and 70° were carried out on gypsum specimens with initial double edge cut cracks. Finally, the strain field was monitored by the DIC method to analyze and summarize...
Proceedings Papers

Paper presented at the ISRM Regional Symposium - 11th Asian Rock Mechanics Symposium, October 21–25, 2021
Paper Number: ISRM-ARMS11-2021-252
... considered the performance of these criteria under Mode I loading, namely, K I ≠ 0, K II ≠ 0. The analytical solution for fracture initiation angle under each of the three mixed-mode criteria were presented, where the results demonstrated that only the elliptical form yielded accurate results...
Proceedings Papers

Paper presented at the ISRM International Symposium - 10th Asian Rock Mechanics Symposium, October 29–November 3, 2018
Paper Number: ISRM-ARMS10-2018-211
... hydraulic fracturing Einstein wellbore integrity Upstream Oil & Gas wing crack initiation asian rock mechanics symposium 29 Reservoir Characterization Wellbore Design tensile microstructure tensile specimen mechanical property shear microstructure construction materials damage...
Proceedings Papers

Paper presented at the ISRM International Symposium - 10th Asian Rock Mechanics Symposium, October 29–November 3, 2018
Paper Number: ISRM-ARMS10-2018-213
... Upstream Oil & Gas initiation complex reservoir isrm international symposium fracture propagation injection hydraulic fracturing cohesive zone model fluid flow Modeling & Simulation propagation permeability fracture fracture mechanics asian rock mechanics symposium 29...
Proceedings Papers

Paper presented at the ISRM International Symposium - 10th Asian Rock Mechanics Symposium, October 29–November 3, 2018
Paper Number: ISRM-ARMS10-2018-023
... Abstract Re-fracturing is a necessary and efficient way to improve the stimulated reservoir volume, enlarge the drainage area and enhance production again. The initiation and propagation mechanism of re-fracture, whereas, still maintain unclear due to complex in-situ stresses distribution...
Proceedings Papers

Paper presented at the ISRM International Symposium - 8th Asian Rock Mechanics Symposium, October 14–16, 2014
Paper Number: ISRM-ARMS8-2014-025
... patches along similar trajectories to bound an elliptical rock bridge, while the linking coalescence cracks directly connect a flaw tip to the neighboring flaw tip to divide the elliptical rock bridge into two parts. A large relative sliding across the shear rupture is observable only after the initiation...
Proceedings Papers

Paper presented at the ISRM International Symposium - 8th Asian Rock Mechanics Symposium, October 14–16, 2014
Paper Number: ISRM-ARMS8-2014-072
... to characterize fracture propagation by freeze-thaw action. The fracture process was characterized by macroscopic observation by digital camera and changes in water absorption. Fracture initiation and propagation inside of the specimen were also observed using X-ray CT scanner. It was found that the fracture...
Proceedings Papers

Paper presented at the ISRM International Symposium - 8th Asian Rock Mechanics Symposium, October 14–16, 2014
Paper Number: ISRM-ARMS8-2014-091
.... For this purpose, application of numerical simulation is one of the most promising approaches. This paper proposed a method for the simulation of dynamic fracturing process through axisymmetric finite element formulation in which the initiation, propagation, branching and coalescence of fractures in heterogeneous...
Proceedings Papers

Paper presented at the ISRM International Symposium - 8th Asian Rock Mechanics Symposium, October 14–16, 2014
Paper Number: ISRM-ARMS8-2014-054
... containing a pre-existing flaw subjected to uniaxial compression. The initiation, propagation and coalescence of micro-cracks are presented; therefore we can understand the whole process of rock failure clearly. Numerical results show that anti-wing cracks can initiate at flaw tips, and they will approach...
Proceedings Papers

Paper presented at the ISRM Regional Symposium - 7th Asian Rock Mechanics Symposium, October 15–19, 2012
Paper Number: ISRM-ARMS7-2012-048
..., crack initiation sequences and overall crack pattern are found to vary with loading conditions. Under a relatively low loading rate or a small magnitude of maximum loading pressure, tensile cracks tend to initiate prior to shear cracks. In contrast, under a relatively high loading rate and a large...
Proceedings Papers

Paper presented at the ISRM Regional Symposium - 7th Asian Rock Mechanics Symposium, October 15–19, 2012
Paper Number: ISRM-ARMS7-2012-050
... ABSTRACT Failure in rocks is attributed to crack initiation and coalescence processes upon loading. Crack behavior study, which has been extensively conducted in various rock types containing artificially created flaws under a quasi-static loading condition over the past decades, is extended...
Proceedings Papers

Paper presented at the ISRM Regional Symposium - 7th Asian Rock Mechanics Symposium, October 15–19, 2012
Paper Number: ISRM-ARMS7-2012-051
... rock fragmentation experiment pressure ring Reservoir Characterization model 1 mechanism explosive energy utilization damage zone air deck crater blast formation mechanics Upstream Oil & Gas blast hole initiation rock mass fragmentation A study to simulate air deck crater blast...
Proceedings Papers

Paper presented at the ISRM International Symposium - 5th Asian Rock Mechanics Symposium, November 24–26, 2008
Paper Number: ISRM-ARMS5-2008-134
...ISRM International Symposium 2008 5th Asian Rock Mechanics Symposium (ARMS5), 24-26 November 2008 Tehran, Iran 1101 MODELING INITIATION OF HYDRAULIC FRACTURES FROM A WELLBORE A. Lakirouhani1, A. Bunger2 and E. Detournay3 1 Zanjan University, Iran ([email protected]) 2 CSIRO Petroleum, Melbourne...
Proceedings Papers

Paper presented at the ISRM International Symposium - 5th Asian Rock Mechanics Symposium, November 24–26, 2008
Paper Number: ISRM-ARMS5-2008-038
... by the sudden internal stress redistribution of the materials caused by the changes in the internal structure. Possible causes of the internal-structure changes are crack initiation and growth, crack opening and closure, dislocation movement, twinning, and phase transformation in monolithic materials and fiber...

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