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Development of Explosive-Free Method for the Breakage of Hard Rock Using Soundless Chemical Demolition Agents.

紀錄類型:	書目-電子資源 : Monograph/item
正題名/作者:	Development of Explosive-Free Method for the Breakage of Hard Rock Using Soundless Chemical Demolition Agents./
作者:	Habib, Kelly-Meriam.
面頁冊數:	1 online resource (195 pages)
附註:	Source: Dissertations Abstracts International, Volume: 85-01, Section: B.
Contained By:	Dissertations Abstracts International85-01B.
標題:	Load. -
電子資源:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=30548946click for full text (PQDT)
ISBN:	9798379864637

Development of Explosive-Free Method for the Breakage of Hard Rock Using Soundless Chemical Demolition Agents.
Habib, Kelly-Meriam.

Development of Explosive-Free Method for the Breakage of Hard Rock Using Soundless Chemical Demolition Agents. - 1 online resource (195 pages)

Source: Dissertations Abstracts International, Volume: 85-01, Section: B.

Thesis (Ph.D.)--McGill University (Canada), 2022.

Includes bibliographical references

Drilling and blasting with explosives is a widely used technique for rock fragmentation in the mining industry for mine development and ore production. However, the use of explosives is associated with rigorous safety and environmental constraints as blasting generates greenhouse gas emissions, ground vibrations and dust. As a result, interest in developing explosive-free technologies as safer alternatives for rock fragmentation in underground mines has emerged. This thesis focuses on Soundless Chemical Demolitions Agents (SCDA) as an environmentally friendly method for rock breakage and a potential replacement of explosives. SCDA, also commonly known as expansive cement, are cementitious powdery substances with quicklime (CaO) as a primary ingredient that expands during the moist curing process which results in high expansive pressure if this hydration reaction happens in a confined condition such as in a borehole. SCDA are commercially available and are being used for block splitting in dimension stone quarries and rehabilitation projects for the demolition of concrete foundations. Although, expansive cement has been on the market for 30 years, it has not been implemented in underground hard rock mines. This is primarily due to the presence of high in-situ stress which would highly limit the initiation and propagation of rock fractures.This thesis is part of a multi-phase project which aims to develop a sound methodology for rock fragmentation in underground mines. More specifically, it is the first phase of the project which focuses on laboratory tests to investigate and optimize the mechanical performance of SCDA in various conditions. A comprehensive state-of-the-art critical review is first conducted to situate the importance and feasibility of SCDA with respect to other explosive-free rock breakage technologies which include thermal fragmentation, plasma blasting, controlled foam injection, radial-axial splitter, and supercritical carbon dioxide. The merits and limitations of each technology are discussed in detail to emphasize the potential of using SCDA as an alternative to blasting with explosives in underground excavation applications. Following the literature review, a series of laboratory tests was conducted on thick-walled steel cylinders filled SCDA to quantify its expansive pressure. Various steel configurations were built to examine expansive pressure variation with borehole size and radial rigidities of the host medium. An axisymmetric finite element model was developed and validated with the steel cylinder experimental results, then used to discern the evolution of elastic modulus of the SCDA with time. A second series of experiments was conducted on prismatic blocks of Stanstead granite with a central horizontal borehole. The blocks are 152.4 mm (6'') wide x 406.44 mm (16") high x 203.2 mm (8") thick. The first set investigates the effect of SCDA on breakage of granite under no load. The influence of borehole size on the time to fracturing with SCDA for borehole sizes of 25.4 mm (1''), 31.75 mm (1.25''), and 38.1 mm (1.5'') is examined. The second set investigates the effect of confinement by applying a uniaxial stress of 5 MPa to the block whereby the time to and length of fracture was monitored. Based on test results, a suitable borehole spacing-to-diameter ratio is suggested to ensure block fracturing for practical applications.

Electronic reproduction.
Ann Arbor, Mich. :
ProQuest,
2023

Mode of access: World Wide Web

ISBN: 9798379864637Subjects--Topical Terms:

3562902
Load.
Index Terms--Genre/Form:

542853
Electronic books.

Development of Explosive-Free Method for the Breakage of Hard Rock Using Soundless Chemical Demolition Agents.
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502 $a Thesis (Ph.D.)--McGill University (Canada), 2022.
504 $a Includes bibliographical references
520 $a Drilling and blasting with explosives is a widely used technique for rock fragmentation in the mining industry for mine development and ore production. However, the use of explosives is associated with rigorous safety and environmental constraints as blasting generates greenhouse gas emissions, ground vibrations and dust. As a result, interest in developing explosive-free technologies as safer alternatives for rock fragmentation in underground mines has emerged. This thesis focuses on Soundless Chemical Demolitions Agents (SCDA) as an environmentally friendly method for rock breakage and a potential replacement of explosives. SCDA, also commonly known as expansive cement, are cementitious powdery substances with quicklime (CaO) as a primary ingredient that expands during the moist curing process which results in high expansive pressure if this hydration reaction happens in a confined condition such as in a borehole. SCDA are commercially available and are being used for block splitting in dimension stone quarries and rehabilitation projects for the demolition of concrete foundations. Although, expansive cement has been on the market for 30 years, it has not been implemented in underground hard rock mines. This is primarily due to the presence of high in-situ stress which would highly limit the initiation and propagation of rock fractures.This thesis is part of a multi-phase project which aims to develop a sound methodology for rock fragmentation in underground mines. More specifically, it is the first phase of the project which focuses on laboratory tests to investigate and optimize the mechanical performance of SCDA in various conditions. A comprehensive state-of-the-art critical review is first conducted to situate the importance and feasibility of SCDA with respect to other explosive-free rock breakage technologies which include thermal fragmentation, plasma blasting, controlled foam injection, radial-axial splitter, and supercritical carbon dioxide. The merits and limitations of each technology are discussed in detail to emphasize the potential of using SCDA as an alternative to blasting with explosives in underground excavation applications. Following the literature review, a series of laboratory tests was conducted on thick-walled steel cylinders filled SCDA to quantify its expansive pressure. Various steel configurations were built to examine expansive pressure variation with borehole size and radial rigidities of the host medium. An axisymmetric finite element model was developed and validated with the steel cylinder experimental results, then used to discern the evolution of elastic modulus of the SCDA with time. A second series of experiments was conducted on prismatic blocks of Stanstead granite with a central horizontal borehole. The blocks are 152.4 mm (6'') wide x 406.44 mm (16") high x 203.2 mm (8") thick. The first set investigates the effect of SCDA on breakage of granite under no load. The influence of borehole size on the time to fracturing with SCDA for borehole sizes of 25.4 mm (1''), 31.75 mm (1.25''), and 38.1 mm (1.5'') is examined. The second set investigates the effect of confinement by applying a uniaxial stress of 5 MPa to the block whereby the time to and length of fracture was monitored. Based on test results, a suitable borehole spacing-to-diameter ratio is suggested to ensure block fracturing for practical applications.
520 $a Le forage et le dynamitage avec des explosifs est une technique largement utilisee pour la fragmentation de la roche dans l'industrie maniere pour le developpement minier et la production de minerai. Pourtant, l'utilisation d'explosifs est associee a des risques securitaires et contraintes environnementales rigoureuses tel que le dynamitage genere des emissions de gaz a effet de serre, des vibrations du sol et de la poussiere. En consequence, l'interet pour le developpement de technologies sans explosifs comme alternatives a augmente pour la fragmentation de la roche dans les mines souterraines. Cette these se concentre sur les agents de demolitions chimique silencieux (SCDA) en tant que methode sure de l'environnement pour la fragmentation de roche et un remplacement potentiel des explosifs. Les SCDA egalement connus sous le nom de ciment expansif sont des substances pulverulentes cimentaires avec la chaux vive (oxyde de calcium ou CaO) comme ingredient principal qui se dilate pendant le processus de durcissement humide ce qui entraine une pression expansive elevee si cette reaction d'hydratation se produit dans un etat confine comme e.g. trou de forage. Les SCDA sont disponibles dans le commerce et sont utilises pour la fragmentation de roche dans les carrieres de pierre de taille et les projets de rehabilitation pour la demolition des fondations en beton. Malgre que le ciment expansif ait ete mis en oeuvre dans les mines souterraines de roche dure. Cela est principalement du a la presence de fortes contraintes in-situ qui limiteraient fortement l'initiation et la propagation des fractures de la roche. Cette these fait partie d'un projet en plus phases qui vise a developper une methodologie solide pour la fragmentation des roches dans les mines souterraines. Plus precisement, il s'agit de la premiere phase du projet qui se concentre sur des essais en laboratoire pour etudier et optimiser les performances mecaniques du SCDA dans diverses conditions. Une revue de litterature complet de l'etat de l'art est d'abord effectuee pour situer l'importance et la faisabilite de la SCDA par rapport a d'autres technologies de rupture de roche sans explosifs notamment la fragmentation thermique, le sablage au plasma, l'injection de mousse controlee, le separateur radial-axial et dioxyde de carbon supercritique. Les merites et les limites de chaque technologie sont discutes en detail pour souligner le potentiel de l'utilisation de SCDA comme alternative au dynamitage avec des explosifs dans les applications d'excavation souterraine. Pour donner suite a la revue de la litterature, une serie d'essais en laboratoire a ete menee sur des cylindres en acier a paroi epaisse remplis de SCDA pour quantifier la pression expansive. Diverses configurations en acier ont ete construites pour examiner la pression expansive avec la taille de trou de forage et les rigidites radiales du milieu hote. Un modele d'elements finis axisymetrique a ete developpe et valide avec les resultats experimentaux du cylindre en acier, puis utiliser pour discerner l'evolution du module d'elasticite du SCDA avec le temps. Une deuxieme serie de tests a ete realisee sur des blocs prismatiques de granite de Stansteadavec un trou de forage centrale. Les blocs mesurent 152.4 mm de large x 404.44 mm de haut x 203.2 mm d'epaisseur. La premiere serie etudie l'effet du SCDA sur la rupture du granite sans charge. L'influence de la taille du trou de forage sur le temps de fragmentation avec SCDA pour les tailles de trous de forage de 25,4 mm (1''), 31,75 mm (1,25'') et 38,1 mm (1,5'') sont examinee.
533 $a Electronic reproduction. $b Ann Arbor, Mich. : $c ProQuest, $d 2023
538 $a Mode of access: World Wide Web
650 4 $a Load. $3 3562902
650 4 $a Mines. $3 3693480
650 4 $a Plasma. $3 877619
650 4 $a Humidity. $3 3559498
650 4 $a Microclimate. $3 3686558
650 4 $a Crack initiation. $3 3564902
650 4 $a Heat. $3 573595
650 4 $a Environmental impact. $3 3564810
650 4 $a Mining. $3 3544442
650 4 $a Demolition. $3 3694296
650 4 $a Carbon dioxide. $3 587886
650 4 $a Cement. $3 862625
650 4 $a Curing. $3 3681399
650 4 $a Concrete cutting. $3 3704319
650 4 $a Drilling. $3 3563985
650 4 $a Drilling & boring machinery. $3 3704320
650 4 $a Underground construction. $3 1061609
650 4 $a Explosives. $3 750429
650 4 $a Atmospheric sciences. $3 3168354
650 4 $a Civil engineering. $3 860360
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773 0 $t Dissertations Abstracts International $g 85-01B.
856 4 0 $u http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=30548946 $z click for full text (PQDT)