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Keywords: Coalescence
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Proceedings Papers

Paper presented at the 53rd U.S. Rock Mechanics/Geomechanics Symposium, June 23–26, 2019
Paper Number: ARMA-2019-0371
... fracturing fluid front fluid pressure flow in porous media prefabricated flaw experiment reservoir geomechanics fluid diffusivity Fluid Dynamics diffusivity Coalescence Injection Rate fracture enclosure flaw pressure unit propagation low injection rate crack coalescence inner tip GonÃ...
Proceedings Papers

Paper presented at the 53rd U.S. Rock Mechanics/Geomechanics Symposium, June 23–26, 2019
Paper Number: ARMA-2019-0388
... paper discusses experimental observations about the influence of different flaw geometries on crack propagation and coalescence through the interface, as well as the role that a frictional interface has in generating new cracks or affecting the cracks that initiate from the flaws. equation of...
Proceedings Papers

Paper presented at the 53rd U.S. Rock Mechanics/Geomechanics Symposium, June 23–26, 2019
Paper Number: ARMA-2019-1776
... geothermal reservoir data acquisition system international journal Upstream Oil & Gas acoustic emission initiation Einstein triaxial loading condition experiment Gonçalves da Silva Coalescence propagation loading condition specimen fracture 1. INTRODUCTION Hydraulic fracturing has been...
Proceedings Papers

Paper presented at the 53rd U.S. Rock Mechanics/Geomechanics Symposium, June 23–26, 2019
Paper Number: ARMA-2019-1762
... sensor while a high resolution camera is used for the implementation of the Digital Image Correlation analysis, in order to monitor the fracturing process. The initiation, interaction and coalescence of the cracks developed during loading is examined. Two wing-cracks are normally nucleated at each flaw...
Proceedings Papers

Paper presented at the 52nd U.S. Rock Mechanics/Geomechanics Symposium, June 17–20, 2018
Paper Number: ARMA-2018-629
... flow rate increase through the propagation and coalescence of pre-existing fractures in granites under triaxial conditions. Results show that the pre-existing fractures can be propagated and coalesced at treatment pressures lower than the minimum principal stress during water injection. Also...
Proceedings Papers

Paper presented at the 51st U.S. Rock Mechanics/Geomechanics Symposium, June 25–28, 2017
Paper Number: ARMA-2017-0784
... ABSTRACT: Investigations on fracturing (cracking) processes in shale, specifically crack initiation, -propagation, and -coalescence contribute to the understanding of shale behavior. This is important for stability and deformability problems encountered in civil and mining engineering. It is...
Proceedings Papers

Paper presented at the 51st U.S. Rock Mechanics/Geomechanics Symposium, June 25–28, 2017
Paper Number: ARMA-2017-0411
... image correlation (DIC) was used to monitor the damage evolution on the specimen surface by measuring full-field displacements. The shear cracks that initiated from the flaws tips that ultimately produced coalescence were observed to propagate roughly parallel to the loading direction such that the...
Proceedings Papers

Paper presented at the 51st U.S. Rock Mechanics/Geomechanics Symposium, June 25–28, 2017
Paper Number: ARMA-2017-0504
... propagation on the specimen surface by measuring displacements during loading. The experimental results indicate that specimens with the smooth interface have lower initiation and coalescence stresses than with the rough interface. Also, a smooth interface seems to arrest tensile cracks reaching the interface...
Proceedings Papers

Paper presented at the 50th U.S. Rock Mechanics/Geomechanics Symposium, June 26–29, 2016
Paper Number: ARMA-2016-283
... case of petroleum source rock development, stimulation is often accomplished by multiple hydraulic fracturing of horizontal wells whereas geothermal reservoir stimulation relies upon injection induced shear on pre-existing fractures and their coalescence. Maximizing facture permeability generation and...
Proceedings Papers

Paper presented at the 50th U.S. Rock Mechanics/Geomechanics Symposium, June 26–29, 2016
Paper Number: ARMA-2016-569
... thought to be related to additional damage induced to the kink due to the loading-unloading cycles. Introduction The mechanical behavior of geomaterials is strongly affected by the presence of micro-cracks. A large number of experiments have been done on crack initiation, propagation, and coalescence...
Proceedings Papers

Paper presented at the 50th U.S. Rock Mechanics/Geomechanics Symposium, June 26–29, 2016
Paper Number: ARMA-2016-588
... in rock slopes. This paper investigates the importance of pre-existing discontinuities and rock bridges at the micro scale on rock strength. Mechanisms of rock crack initiation, coalescence and propagation in rock with an emphasis on rock bridge failure are analyzed using 2D finite-discrete element...
Proceedings Papers

Paper presented at the 50th U.S. Rock Mechanics/Geomechanics Symposium, June 26–29, 2016
Paper Number: ARMA-2016-851
... strength of the Mohr-Coulomb contact elements. The results show that injection into a single natural fracture may lead to the coalescence of multiple natural fracture which can be regarded as an important advantage of this stimulation technique. However, it was found that network connectivity and fracture...
Proceedings Papers

Paper presented at the 49th U.S. Rock Mechanics/Geomechanics Symposium, June 28–July 1, 2015
Paper Number: ARMA-2015-179
... and a crack under uniaxial compression are investigated in this paper. Experiments of specimens containing a hole and a crack are conducted. Subsequently, Particle Flow Code 2D (PFC2D) is adopted to simulate the fracture behavior. The crack initiation, propagation and coalescence with a hole are...
Proceedings Papers

Paper presented at the 49th U.S. Rock Mechanics/Geomechanics Symposium, June 28–July 1, 2015
Paper Number: ARMA-2015-229
...1. INTRODUCTION Crack propagation and coalescence in rock is a popular research topic especially in underground excavation projects or slope stability problems in which the dynamic fracture phenomena are in dominance. To reduce the scale of the problem, different models are designed for...
Proceedings Papers

Paper presented at the 49th U.S. Rock Mechanics/Geomechanics Symposium, June 28–July 1, 2015
Paper Number: ARMA-2015-245
...1. INTRODUCTION A large number of experimental studies have been conducted on crack initiation, propagation, and coalescence in pre-cracked brittle materials. In most of these studies, the pre-existing crack (flaw) has been subjected to mixed mode loading (mode I: opening or tensile and mode II: in...
Proceedings Papers

Paper presented at the 49th U.S. Rock Mechanics/Geomechanics Symposium, June 28–July 1, 2015
Paper Number: ARMA-2015-313
... experiment fracture pattern propagation simulation fdem fracture pattern complex reservoir crack coalescence rock mech flaw initiation interaction coalescence decomposition crack initiation hydraulic fracturing fracture coalescence element method munjiza rougier finite...
Proceedings Papers

Paper presented at the 49th U.S. Rock Mechanics/Geomechanics Symposium, June 28–July 1, 2015
Paper Number: ARMA-2015-488
... for further fracturing and damage by coalescence and propagation. In brittle fracture mechanics, stress intensity factor and critical fracture toughness are the most fundamental parameters used for determining fracture propagation, energy release rate, and crack extension driving forces. Typical...
Proceedings Papers

Paper presented at the 49th U.S. Rock Mechanics/Geomechanics Symposium, June 28–July 1, 2015
Paper Number: ARMA-2015-487
... compression strength simulation displacement reservoir geomechanics reference point wing crack flaw coalescence specimen crack initiation propagation rock mech einstein upstream oil & gas frock uniaxial compression hydraulic fracturing initiation fracture numerical simulation 1...
Proceedings Papers

Paper presented at the 48th U.S. Rock Mechanics/Geomechanics Symposium, June 1–4, 2014
Paper Number: ARMA-2014-7448
... Abstract Crack initiation, propagation and coalescence in rock material play an important role in geo-mechanics. Since, friction of rock joints surface is one of the most important phenomena in rock mechanics, consideration of crack surface friction in rock fracture mechanics is necessary. In...
Proceedings Papers

Paper presented at the 48th U.S. Rock Mechanics/Geomechanics Symposium, June 1–4, 2014
Paper Number: ARMA-2014-7528
... sensor initiation Coalescence construction materials coplanar flaw gypsum initiation point Reservoir Characterization Upstream Oil & Gas process zone crack initiation point ae energy rate gypsum specimen microcrack process zone white patch AE activity fracture crack initiation 1...

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