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Keywords: coalescence
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Proceedings Papers

Paper presented at the 57th U.S. Rock Mechanics/Geomechanics Symposium, June 25–28, 2023
Paper Number: ARMA-2023-0364
... by nucleation, expansion, and coalescence of joints, resulting in a large number of deaths and huge losses of material wealth. For example, the typical wedge-shaped destruction along the fault on the steep slope of the Three Gorges Project and the step-type destruction of the rock slope at the Xiaowan...
Proceedings Papers

Paper presented at the 55th U.S. Rock Mechanics/Geomechanics Symposium, June 18–25, 2021
Paper Number: ARMA-2021-1131
... ABSTRACT: Fracture coalescence is of great significance in the damage and fragmentation behavior of brittle materials. To better and thoroughly study the process of fracture coalescence, numerical investigation of gypsum specimens with different pre-existing flaws under different loading...
Proceedings Papers

Paper presented at the 55th U.S. Rock Mechanics/Geomechanics Symposium, June 18–25, 2021
Paper Number: ARMA-2021-1223
... ABSTRACT: Crack growth and coalescence from discontinuities is the fundamental process that underlies the majority of rock mass failures. Still, however, numerical simulation of this process remains a formidable challenge. The main reasons include that tensile and shear fractures are often...
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 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 specimen fracture Einstein Coalescence propagation triaxial loading condition experiment loading condition Gonçalves da Silva ARMA 19 1776 Effect of the state of stress...
Proceedings Papers

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

Paper presented at the 53rd U.S. Rock Mechanics/Geomechanics Symposium, June 23–26, 2019
Paper Number: ARMA-2019-0388
.... The 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...
Proceedings Papers

Paper presented at the 52nd U.S. Rock Mechanics/Geomechanics Symposium, June 17–20, 2018
Paper Number: ARMA-2018-629
... of 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-2017-0411
... 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...
Proceedings Papers

Paper presented at the 51st U.S. Rock Mechanics/Geomechanics Symposium, June 25–28, 2017
Paper Number: ARMA-2017-0504
... 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, while shear...
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...
Proceedings Papers

Paper presented at the 50th U.S. Rock Mechanics/Geomechanics Symposium, June 26–29, 2016
Paper Number: ARMA-2016-283
.... In the 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...
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 (FDEM...
Proceedings Papers

Paper presented at the 50th U.S. Rock Mechanics/Geomechanics Symposium, June 26–29, 2016
Paper Number: ARMA-2016-569
... is 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-2016-851
... 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 coalescence...
Proceedings Papers

Paper presented at the 49th U.S. Rock Mechanics/Geomechanics Symposium, June 28–July 1, 2015
Paper Number: ARMA-2015-179
.... Subsequently, Particle Flow Code 2D (PFC2D) is adopted to simulate the fracture behavior. The crack initiation, propagation and coalescence with a hole are investigated. The propagating cracks contain first cracks and secondary cracks. Both first cracks and secondary cracks will disturb the stress field...
Proceedings Papers

Paper presented at the 49th U.S. Rock Mechanics/Geomechanics Symposium, June 28–July 1, 2015
Paper Number: ARMA-2015-245
... Abstract Crack initiation, propagation and coalescence, from pre-cracked rock specimens, were detected in the laboratory using elastic wave transmission and reflection signals. The experiments were conducted on prismatic Indiana limestone specimens with two parallel pre-existing flaws...
Proceedings Papers

Paper presented at the 49th U.S. Rock Mechanics/Geomechanics Symposium, June 28–July 1, 2015
Paper Number: ARMA-2015-229
... Abstract The dynamic behavior of crack propagation and coalescence in rock is investigated using the distinct lattice spring model (DLSM). Discontinuum based element model has been proven as a promising tool in the study of dynamic fracture in brittle materials like rock. As a newly developed...
Proceedings Papers

Paper presented at the 49th U.S. Rock Mechanics/Geomechanics Symposium, June 28–July 1, 2015
Paper Number: ARMA-2015-313
... Abstract Fracture coalescence has been identified as one of the factors playing an important role in the behavior of brittle materials. In this paper this phenomena is simulated by using an in-house implementation of the Combined Finite-Discrete Element method (FDEM). Key aspects of FDEM...
Proceedings Papers

Paper presented at the 49th U.S. Rock Mechanics/Geomechanics Symposium, June 28–July 1, 2015
Paper Number: ARMA-2015-488
... loading, applying tensile stress for rock breakage is the premise for new cutters. Moreover, rock initial flaws and cracks are locations for stress concentration, and play an important role for further fracturing and damage by coalescence and propagation. In brittle fracture mechanics, stress intensity...

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