Chemically dependent mechanical properties of natural andesite rock fractures
Different engineering rock works are affected by chemical–mechanical coupling phenomena in rock mass. Friction, strength of fracture walls, shape of asperities, and roughness control hydraulic and mechanical behaviors of fractures, which are all affected by chemical solutions. In addition, the effic...
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| Veröffentlicht in: | Canadian geotechnical journal 2018-06, Vol.55 (6), p.881-893 |
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| container_title | Canadian geotechnical journal |
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| creator | Mohtarami, E Baghbanan, A Akbariforouz, M Hashemolhosseini, H Asadollahpour, E |
| description | Different engineering rock works are affected by chemical–mechanical coupling phenomena in rock mass. Friction, strength of fracture walls, shape of asperities, and roughness control hydraulic and mechanical behaviors of fractures, which are all affected by chemical solutions. In addition, the efficiency of some operations such as leaching depend on the fracture conductivity in a confined condition. To evaluate the effects of leaching agents on the mechanical and geometrical properties of andesite rock fractures, a set of laboratory-scale experiments were conducted on three types of andesite in a sulfate medium with different pH values. Although the cohesion and shear strength reduced by decreasing the pH value, the roughness and shear stiffness of fractures did not follow a unique trend. Scanning electron microscope images indicated that the reason is mainly due to the selective chemical dissolution of the more reactive minerals in acidic solution. It is shown that fracture conductivity is a strong function of confining stress, asperities resistance, and aperture in such a way that confining pressure decreases the conductivity appreciably and the reduction rate depends on the mineralogy of fracture surfaces. |
| doi_str_mv | 10.1139/cgj-2016-0626 |
| format | Article |
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Friction, strength of fracture walls, shape of asperities, and roughness control hydraulic and mechanical behaviors of fractures, which are all affected by chemical solutions. In addition, the efficiency of some operations such as leaching depend on the fracture conductivity in a confined condition. To evaluate the effects of leaching agents on the mechanical and geometrical properties of andesite rock fractures, a set of laboratory-scale experiments were conducted on three types of andesite in a sulfate medium with different pH values. Although the cohesion and shear strength reduced by decreasing the pH value, the roughness and shear stiffness of fractures did not follow a unique trend. Scanning electron microscope images indicated that the reason is mainly due to the selective chemical dissolution of the more reactive minerals in acidic solution. It is shown that fracture conductivity is a strong function of confining stress, asperities resistance, and aperture in such a way that confining pressure decreases the conductivity appreciably and the reduction rate depends on the mineralogy of fracture surfaces.</description><identifier>ISSN: 0008-3674</identifier><identifier>EISSN: 1208-6010</identifier><identifier>DOI: 10.1139/cgj-2016-0626</identifier><language>eng</language><publisher>Ottawa: NRC Research Press</publisher><subject>Andesite ; chemical degradation ; chemical–mechanical coupling ; coefficient de rugosité de joint ; Conductivity ; Confinement ; Confining ; couplage chimio mécanique ; Dissolution ; Dissolving ; dégradation chimique ; Engineering models ; fracture de roche ; Fracture surfaces ; Fractures ; Friction ; joint roughness coefficient ; Leaching ; Mechanical properties ; microscope électronique à balayage ; Mineralogy ; Minerals ; Organic chemistry ; pH effects ; rock fracture ; Rock mechanics ; Rocks ; Roughness ; scanning electron microscope ; Scanning electron microscopy ; Shear stiffness ; Shear strength ; Solutions ; Sulfates</subject><ispartof>Canadian geotechnical journal, 2018-06, Vol.55 (6), p.881-893</ispartof><rights>COPYRIGHT 2018 NRC Research Press</rights><rights>2018 Published by NRC Research Press</rights><lds50>peer_reviewed</lds50><woscitedreferencessubscribed>false</woscitedreferencessubscribed><citedby>FETCH-LOGICAL-a529t-7303d7d78d73f7adcac2d9991217ba5735a2545448dc3207f38e50e659260eaa3</citedby><cites>FETCH-LOGICAL-a529t-7303d7d78d73f7adcac2d9991217ba5735a2545448dc3207f38e50e659260eaa3</cites></display><links><openurl>$$Topenurl_article</openurl><openurlfulltext>$$Topenurlfull_article</openurlfulltext><thumbnail>$$Tsyndetics_thumb_exl</thumbnail><linktopdf>$$Uhttps://cdnsciencepub.com/doi/pdf/10.1139/cgj-2016-0626$$EPDF$$P50$$Gnrcresearch$$H</linktopdf><linktohtml>$$Uhttps://cdnsciencepub.com/doi/full/10.1139/cgj-2016-0626$$EHTML$$P50$$Gnrcresearch$$H</linktohtml><link.rule.ids>314,780,784,2932,27924,27925,64428,65234</link.rule.ids></links><search><creatorcontrib>Mohtarami, E</creatorcontrib><creatorcontrib>Baghbanan, A</creatorcontrib><creatorcontrib>Akbariforouz, M</creatorcontrib><creatorcontrib>Hashemolhosseini, H</creatorcontrib><creatorcontrib>Asadollahpour, E</creatorcontrib><title>Chemically dependent mechanical properties of natural andesite rock fractures</title><title>Canadian geotechnical journal</title><description>Different engineering rock works are affected by chemical–mechanical coupling phenomena in rock mass. Friction, strength of fracture walls, shape of asperities, and roughness control hydraulic and mechanical behaviors of fractures, which are all affected by chemical solutions. In addition, the efficiency of some operations such as leaching depend on the fracture conductivity in a confined condition. To evaluate the effects of leaching agents on the mechanical and geometrical properties of andesite rock fractures, a set of laboratory-scale experiments were conducted on three types of andesite in a sulfate medium with different pH values. Although the cohesion and shear strength reduced by decreasing the pH value, the roughness and shear stiffness of fractures did not follow a unique trend. Scanning electron microscope images indicated that the reason is mainly due to the selective chemical dissolution of the more reactive minerals in acidic solution. It is shown that fracture conductivity is a strong function of confining stress, asperities resistance, and aperture in such a way that confining pressure decreases the conductivity appreciably and the reduction rate depends on the mineralogy of fracture surfaces.</description><subject>Andesite</subject><subject>chemical degradation</subject><subject>chemical–mechanical coupling</subject><subject>coefficient de rugosité de joint</subject><subject>Conductivity</subject><subject>Confinement</subject><subject>Confining</subject><subject>couplage chimio mécanique</subject><subject>Dissolution</subject><subject>Dissolving</subject><subject>dégradation chimique</subject><subject>Engineering models</subject><subject>fracture de roche</subject><subject>Fracture surfaces</subject><subject>Fractures</subject><subject>Friction</subject><subject>joint roughness coefficient</subject><subject>Leaching</subject><subject>Mechanical properties</subject><subject>microscope électronique à balayage</subject><subject>Mineralogy</subject><subject>Minerals</subject><subject>Organic chemistry</subject><subject>pH effects</subject><subject>rock fracture</subject><subject>Rock mechanics</subject><subject>Rocks</subject><subject>Roughness</subject><subject>scanning electron microscope</subject><subject>Scanning electron microscopy</subject><subject>Shear stiffness</subject><subject>Shear strength</subject><subject>Solutions</subject><subject>Sulfates</subject><issn>0008-3674</issn><issn>1208-6010</issn><fulltext>true</fulltext><rsrctype>article</rsrctype><creationdate>2018</creationdate><recordtype>article</recordtype><recordid>eNqVkstr3DAQxkVoodukx95Nc-rBiR6WZR_DkiaBPKCPs5hK411vd2VH0kLz32dMCknAUIJAEh-_Gc2MPsY-C34ihGpP3WpTSi7qkteyPmALIXlT1lzwd2zBOd1VbaoP7GNKG85FVUm5YDfLNe56B9vtQ-FxxOAx5GKHbg1hkosxDiPG3GMqhq4IkPeRVCAu9RmLOLg_RRfBkY7piL3vYJvw07_zkP36dv5zeVle311cLc-uS9CyzaVRXHnjTeON6gx4B076tm2FFOY3aKM0SF3pqmq8U5KbTjWoOda6lTVHAHXIjp_yUnX3e0zZboZ9DPSklUJWWtGunqkVbNH2oRsyFbrrk7NnupINzUBKosoZaoUBqdEhYNeT_Ir_MsO7sb-3L6GTGYiWn6Y9m_XrqwBiMv7NK9inZK9-fH8DezvbnYtDShE7O8Z-B_HBCm4n11hyjZ1cYyfXEM-f-BAdfShCdOv_hDwCVyy_Yw</recordid><startdate>20180601</startdate><enddate>20180601</enddate><creator>Mohtarami, E</creator><creator>Baghbanan, A</creator><creator>Akbariforouz, M</creator><creator>Hashemolhosseini, H</creator><creator>Asadollahpour, E</creator><general>NRC Research Press</general><general>Canadian Science Publishing NRC Research Press</general><scope>AAYXX</scope><scope>CITATION</scope><scope>ISN</scope><scope>ISR</scope><scope>7TG</scope><scope>7UA</scope><scope>8FD</scope><scope>C1K</scope><scope>F1W</scope><scope>FR3</scope><scope>H96</scope><scope>KL.</scope><scope>KR7</scope><scope>L.G</scope></search><sort><creationdate>20180601</creationdate><title>Chemically dependent mechanical properties of natural andesite rock fractures</title><author>Mohtarami, E ; Baghbanan, A ; Akbariforouz, M ; Hashemolhosseini, H ; Asadollahpour, E</author></sort><facets><frbrtype>5</frbrtype><frbrgroupid>cdi_FETCH-LOGICAL-a529t-7303d7d78d73f7adcac2d9991217ba5735a2545448dc3207f38e50e659260eaa3</frbrgroupid><rsrctype>articles</rsrctype><prefilter>articles</prefilter><language>eng</language><creationdate>2018</creationdate><topic>Andesite</topic><topic>chemical degradation</topic><topic>chemical–mechanical coupling</topic><topic>coefficient de rugosité de joint</topic><topic>Conductivity</topic><topic>Confinement</topic><topic>Confining</topic><topic>couplage chimio mécanique</topic><topic>Dissolution</topic><topic>Dissolving</topic><topic>dégradation chimique</topic><topic>Engineering models</topic><topic>fracture de roche</topic><topic>Fracture surfaces</topic><topic>Fractures</topic><topic>Friction</topic><topic>joint roughness coefficient</topic><topic>Leaching</topic><topic>Mechanical properties</topic><topic>microscope électronique à balayage</topic><topic>Mineralogy</topic><topic>Minerals</topic><topic>Organic chemistry</topic><topic>pH effects</topic><topic>rock fracture</topic><topic>Rock mechanics</topic><topic>Rocks</topic><topic>Roughness</topic><topic>scanning electron microscope</topic><topic>Scanning electron microscopy</topic><topic>Shear stiffness</topic><topic>Shear strength</topic><topic>Solutions</topic><topic>Sulfates</topic><toplevel>peer_reviewed</toplevel><toplevel>online_resources</toplevel><creatorcontrib>Mohtarami, E</creatorcontrib><creatorcontrib>Baghbanan, A</creatorcontrib><creatorcontrib>Akbariforouz, M</creatorcontrib><creatorcontrib>Hashemolhosseini, H</creatorcontrib><creatorcontrib>Asadollahpour, E</creatorcontrib><collection>CrossRef</collection><collection>Gale In Context: Canada</collection><collection>Gale In Context: Science</collection><collection>Meteorological & Geoastrophysical Abstracts</collection><collection>Water Resources Abstracts</collection><collection>Technology Research Database</collection><collection>Environmental Sciences and Pollution Management</collection><collection>ASFA: Aquatic Sciences and Fisheries Abstracts</collection><collection>Engineering Research Database</collection><collection>Aquatic Science & Fisheries Abstracts (ASFA) 2: Ocean Technology, Policy & Non-Living Resources</collection><collection>Meteorological & Geoastrophysical Abstracts - Academic</collection><collection>Civil Engineering Abstracts</collection><collection>Aquatic Science & Fisheries Abstracts (ASFA) Professional</collection><jtitle>Canadian geotechnical journal</jtitle></facets><delivery><delcategory>Remote Search Resource</delcategory><fulltext>fulltext</fulltext></delivery><addata><au>Mohtarami, E</au><au>Baghbanan, A</au><au>Akbariforouz, M</au><au>Hashemolhosseini, H</au><au>Asadollahpour, E</au><format>journal</format><genre>article</genre><ristype>JOUR</ristype><atitle>Chemically dependent mechanical properties of natural andesite rock fractures</atitle><jtitle>Canadian geotechnical journal</jtitle><date>2018-06-01</date><risdate>2018</risdate><volume>55</volume><issue>6</issue><spage>881</spage><epage>893</epage><pages>881-893</pages><issn>0008-3674</issn><eissn>1208-6010</eissn><abstract>Different engineering rock works are affected by chemical–mechanical coupling phenomena in rock mass. Friction, strength of fracture walls, shape of asperities, and roughness control hydraulic and mechanical behaviors of fractures, which are all affected by chemical solutions. In addition, the efficiency of some operations such as leaching depend on the fracture conductivity in a confined condition. To evaluate the effects of leaching agents on the mechanical and geometrical properties of andesite rock fractures, a set of laboratory-scale experiments were conducted on three types of andesite in a sulfate medium with different pH values. Although the cohesion and shear strength reduced by decreasing the pH value, the roughness and shear stiffness of fractures did not follow a unique trend. Scanning electron microscope images indicated that the reason is mainly due to the selective chemical dissolution of the more reactive minerals in acidic solution. It is shown that fracture conductivity is a strong function of confining stress, asperities resistance, and aperture in such a way that confining pressure decreases the conductivity appreciably and the reduction rate depends on the mineralogy of fracture surfaces.</abstract><cop>Ottawa</cop><pub>NRC Research Press</pub><doi>10.1139/cgj-2016-0626</doi><tpages>13</tpages></addata></record> |
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| subjects | Andesite chemical degradation chemical–mechanical coupling coefficient de rugosité de joint Conductivity Confinement Confining couplage chimio mécanique Dissolution Dissolving dégradation chimique Engineering models fracture de roche Fracture surfaces Fractures Friction joint roughness coefficient Leaching Mechanical properties microscope électronique à balayage Mineralogy Minerals Organic chemistry pH effects rock fracture Rock mechanics Rocks Roughness scanning electron microscope Scanning electron microscopy Shear stiffness Shear strength Solutions Sulfates |
| title | Chemically dependent mechanical properties of natural andesite rock fractures |
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