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Article: A hypothesis for crack free interior surfaces of Longyou caverns caved in argillaceous siltstone 2000 years ago

TitleA hypothesis for crack free interior surfaces of Longyou caverns caved in argillaceous siltstone 2000 years ago
Authors
KeywordsArgillaceous siltstone
Crack
Environment
Grotto
Longyou
Rock cavern
Self-healing
Water
Issue Date2010
PublisherGaodeng Jiaoyu Chubanshe. The Journal's web site is located at http://www.springer.com/engineering/journal/11709
Citation
Frontiers Of Architecture And Civil Engineering In China, 2010, v. 4 n. 2, p. 165-177 How to Cite?
AbstractFive complete caverns were discovered in Longyou in 1992. They were manually caved in argillaceous siltstone at shallow depths more than 2000 years ago. When they were un-watered, their integrity was maintained completely, and their interior rock surfaces were free of old cracks. Since then, however, the rock's interior faces have initiated and propagated more and more cracks. This paper attempts to address the question of why the rock interior faces were free of old cracks once they were unearthed. To address this question, this paper proposes a hypothesis that the argillaceous siltstone has the ability of self-healing its cracks over a short period of time under weak acid water environment. Data and evidence are presented herewith to prove the hypothesis. They include observations and measurements in the field and test results in the laboratory. Specifically, a three-point bending test is used to form a tensile crack in a rectangular rock specimen and a dead load test for the specimen immersed in initially weak acid water is used for self-healing its crack. The results have shown that the argillaceous siltstone is in a state of weak alkalinity and the rain water at the site is in a state of weak acidity. Therefore, when it is immersed in weak acid water for some time, the argillaceous siltstone would be able to make chemical reactions to generate new minerals such as calcite. The new minerals would be able to infill the cracks and then heal the crack within a few years. Once the crack is self-healed, the rock can regain its strength and integrity. Consequently, the rock interior surfaces could be free of old cracks when the water was pumped out of the caverns. © 2010 Higher Education Press and Springer-Verlag Berlin Heidelberg.
Persistent Identifierhttp://hdl.handle.net/10722/124539
ISSN
References

 

DC FieldValueLanguage
dc.contributor.authorYue, ZQen_HK
dc.contributor.authorFan, Sen_HK
dc.contributor.authorYang, Zen_HK
dc.contributor.authorLi, Len_HK
dc.contributor.authorZhang, Len_HK
dc.contributor.authorZhang, Zen_HK
dc.date.accessioned2010-10-31T10:40:14Z-
dc.date.available2010-10-31T10:40:14Z-
dc.date.issued2010en_HK
dc.identifier.citationFrontiers Of Architecture And Civil Engineering In China, 2010, v. 4 n. 2, p. 165-177en_HK
dc.identifier.issn1673-7407en_HK
dc.identifier.urihttp://hdl.handle.net/10722/124539-
dc.description.abstractFive complete caverns were discovered in Longyou in 1992. They were manually caved in argillaceous siltstone at shallow depths more than 2000 years ago. When they were un-watered, their integrity was maintained completely, and their interior rock surfaces were free of old cracks. Since then, however, the rock's interior faces have initiated and propagated more and more cracks. This paper attempts to address the question of why the rock interior faces were free of old cracks once they were unearthed. To address this question, this paper proposes a hypothesis that the argillaceous siltstone has the ability of self-healing its cracks over a short period of time under weak acid water environment. Data and evidence are presented herewith to prove the hypothesis. They include observations and measurements in the field and test results in the laboratory. Specifically, a three-point bending test is used to form a tensile crack in a rectangular rock specimen and a dead load test for the specimen immersed in initially weak acid water is used for self-healing its crack. The results have shown that the argillaceous siltstone is in a state of weak alkalinity and the rain water at the site is in a state of weak acidity. Therefore, when it is immersed in weak acid water for some time, the argillaceous siltstone would be able to make chemical reactions to generate new minerals such as calcite. The new minerals would be able to infill the cracks and then heal the crack within a few years. Once the crack is self-healed, the rock can regain its strength and integrity. Consequently, the rock interior surfaces could be free of old cracks when the water was pumped out of the caverns. © 2010 Higher Education Press and Springer-Verlag Berlin Heidelberg.en_HK
dc.languageengen_HK
dc.publisherGaodeng Jiaoyu Chubanshe. The Journal's web site is located at http://www.springer.com/engineering/journal/11709en_HK
dc.relation.ispartofFrontiers of Architecture and Civil Engineering in Chinaen_HK
dc.subjectArgillaceous siltstoneen_HK
dc.subjectCracken_HK
dc.subjectEnvironmenten_HK
dc.subjectGrottoen_HK
dc.subjectLongyouen_HK
dc.subjectRock cavernen_HK
dc.subjectSelf-healingen_HK
dc.subjectWateren_HK
dc.titleA hypothesis for crack free interior surfaces of Longyou caverns caved in argillaceous siltstone 2000 years agoen_HK
dc.typeArticleen_HK
dc.identifier.openurlhttp://library.hku.hk:4550/resserv?sid=HKU:IR&issn=1673-7407&volume=4&issue=2&spage=165&epage=177&date=2010&atitle=A+hypothesis+for+crack+free+interior+surfaces+of+Longyou+caverns+caved+in+argillaceous+siltstone+2000+years+agoen_HK
dc.identifier.emailYue, ZQ:yueqzq@hkucc.hku.hken_HK
dc.identifier.authorityYue, ZQ=rp00209en_HK
dc.description.naturelink_to_subscribed_fulltext-
dc.identifier.doi10.1007/s11709-010-0018-1en_HK
dc.identifier.scopuseid_2-s2.0-77953123285en_HK
dc.identifier.hkuros179408en_HK
dc.relation.referenceshttp://www.scopus.com/mlt/select.url?eid=2-s2.0-77953123285&selection=ref&src=s&origin=recordpageen_HK
dc.identifier.volume4en_HK
dc.identifier.issue2en_HK
dc.identifier.spage165en_HK
dc.identifier.epage177en_HK
dc.publisher.placeChinaen_HK
dc.identifier.scopusauthoridYue, ZQ=7102782735en_HK
dc.identifier.scopusauthoridFan, S=36096470300en_HK
dc.identifier.scopusauthoridYang, Z=8288205900en_HK
dc.identifier.scopusauthoridLi, L=36096942100en_HK
dc.identifier.scopusauthoridZhang, L=25623890300en_HK
dc.identifier.scopusauthoridZhang, Z=36097302900en_HK
dc.identifier.citeulike7193101-

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