The role of crosshole seismic tomography for site characterization and grout injection evaluation on Carmo convent foundations
Autor(a) principal: | |
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Data de Publicação: | 2004 |
Outros Autores: | , |
Tipo de documento: | Artigo |
Idioma: | eng |
Título da fonte: | Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) |
Texto Completo: | http://repositorio.lnec.pt:8080/jspui/handle/123456789/1003702 |
Resumo: | The Carmo convent (XIV century) is founded on a silty-sand formation subjected to several negative impacts that have weakened the stiffness and strength characteristics of the local soils. A previous finite element analysis was carried out to assess the stability conditions for constructing a new underground railroad passing 20 meters below the convent foundations. The results indicated that upper soils might be, in some areas, highly uncompressed and very close to failure or in a plastic state. To confirm these and to try mapping the higher uncompressed zones, various instrumental measurements and in situ tests were carried out, including an extensive crosshole seismic tomography survey on 26 crosshole sections to obtain their P-wave velocity field. In general, the seismic tomographies obtained validated the finite element results. A jet grout treatment test was carried out at a zone under the convent foundations where the seismic tomography had revealed very low P-wave velocity. Afterwards, the crosshole seismic test was repeated and the corresponding tomography showed that upper soil velocities had increased to values near the velocities for deeper (and less disturbed) soils. Additionally, three crosshole seismic tomographies were performed at a control site with a geological setting similar to the convent foundations, but not subjected to the same negative impacts. The P-wave velocities obtained for these undisturbed soils are about the same as the velocities for the convent foundations after the grout treatment, which confirms the test injection efficiency in improving soil characteristics below the Carmo convent foundations. |
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The role of crosshole seismic tomography for site characterization and grout injection evaluation on Carmo convent foundationsSeismic tomographyP-wave velocityUncompressed soilsGrout injection evaluationThe Carmo convent (XIV century) is founded on a silty-sand formation subjected to several negative impacts that have weakened the stiffness and strength characteristics of the local soils. A previous finite element analysis was carried out to assess the stability conditions for constructing a new underground railroad passing 20 meters below the convent foundations. The results indicated that upper soils might be, in some areas, highly uncompressed and very close to failure or in a plastic state. To confirm these and to try mapping the higher uncompressed zones, various instrumental measurements and in situ tests were carried out, including an extensive crosshole seismic tomography survey on 26 crosshole sections to obtain their P-wave velocity field. In general, the seismic tomographies obtained validated the finite element results. A jet grout treatment test was carried out at a zone under the convent foundations where the seismic tomography had revealed very low P-wave velocity. Afterwards, the crosshole seismic test was repeated and the corresponding tomography showed that upper soil velocities had increased to values near the velocities for deeper (and less disturbed) soils. Additionally, three crosshole seismic tomographies were performed at a control site with a geological setting similar to the convent foundations, but not subjected to the same negative impacts. The P-wave velocities obtained for these undisturbed soils are about the same as the velocities for the convent foundations after the grout treatment, which confirms the test injection efficiency in improving soil characteristics below the Carmo convent foundations.Millpress, Rotterdam2012-08-20T14:34:39Z2014-10-10T11:18:31Z2017-04-12T14:53:47Z2004-09-01T00:00:00Z2004-09info:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/articleapplication/pdfhttp://repositorio.lnec.pt:8080/jspui/handle/123456789/1003702engISBN 90 5966 009 9Coelho, M. J.Salgado, F. M.Rodrigues, Linfo:eu-repo/semantics/openAccessreponame:Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos)instname:Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informaçãoinstacron:RCAAP2024-01-13T03:02:24Zoai:localhost:123456789/1003702Portal AgregadorONGhttps://www.rcaap.pt/oai/openaireopendoar:71602024-03-20T01:38:32.943757Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) - Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informaçãofalse |
dc.title.none.fl_str_mv |
The role of crosshole seismic tomography for site characterization and grout injection evaluation on Carmo convent foundations |
title |
The role of crosshole seismic tomography for site characterization and grout injection evaluation on Carmo convent foundations |
spellingShingle |
The role of crosshole seismic tomography for site characterization and grout injection evaluation on Carmo convent foundations Coelho, M. J. Seismic tomography P-wave velocity Uncompressed soils Grout injection evaluation |
title_short |
The role of crosshole seismic tomography for site characterization and grout injection evaluation on Carmo convent foundations |
title_full |
The role of crosshole seismic tomography for site characterization and grout injection evaluation on Carmo convent foundations |
title_fullStr |
The role of crosshole seismic tomography for site characterization and grout injection evaluation on Carmo convent foundations |
title_full_unstemmed |
The role of crosshole seismic tomography for site characterization and grout injection evaluation on Carmo convent foundations |
title_sort |
The role of crosshole seismic tomography for site characterization and grout injection evaluation on Carmo convent foundations |
author |
Coelho, M. J. |
author_facet |
Coelho, M. J. Salgado, F. M. Rodrigues, L |
author_role |
author |
author2 |
Salgado, F. M. Rodrigues, L |
author2_role |
author author |
dc.contributor.author.fl_str_mv |
Coelho, M. J. Salgado, F. M. Rodrigues, L |
dc.subject.por.fl_str_mv |
Seismic tomography P-wave velocity Uncompressed soils Grout injection evaluation |
topic |
Seismic tomography P-wave velocity Uncompressed soils Grout injection evaluation |
description |
The Carmo convent (XIV century) is founded on a silty-sand formation subjected to several negative impacts that have weakened the stiffness and strength characteristics of the local soils. A previous finite element analysis was carried out to assess the stability conditions for constructing a new underground railroad passing 20 meters below the convent foundations. The results indicated that upper soils might be, in some areas, highly uncompressed and very close to failure or in a plastic state. To confirm these and to try mapping the higher uncompressed zones, various instrumental measurements and in situ tests were carried out, including an extensive crosshole seismic tomography survey on 26 crosshole sections to obtain their P-wave velocity field. In general, the seismic tomographies obtained validated the finite element results. A jet grout treatment test was carried out at a zone under the convent foundations where the seismic tomography had revealed very low P-wave velocity. Afterwards, the crosshole seismic test was repeated and the corresponding tomography showed that upper soil velocities had increased to values near the velocities for deeper (and less disturbed) soils. Additionally, three crosshole seismic tomographies were performed at a control site with a geological setting similar to the convent foundations, but not subjected to the same negative impacts. The P-wave velocities obtained for these undisturbed soils are about the same as the velocities for the convent foundations after the grout treatment, which confirms the test injection efficiency in improving soil characteristics below the Carmo convent foundations. |
publishDate |
2004 |
dc.date.none.fl_str_mv |
2004-09-01T00:00:00Z 2004-09 2012-08-20T14:34:39Z 2014-10-10T11:18:31Z 2017-04-12T14:53:47Z |
dc.type.status.fl_str_mv |
info:eu-repo/semantics/publishedVersion |
dc.type.driver.fl_str_mv |
info:eu-repo/semantics/article |
format |
article |
status_str |
publishedVersion |
dc.identifier.uri.fl_str_mv |
http://repositorio.lnec.pt:8080/jspui/handle/123456789/1003702 |
url |
http://repositorio.lnec.pt:8080/jspui/handle/123456789/1003702 |
dc.language.iso.fl_str_mv |
eng |
language |
eng |
dc.relation.none.fl_str_mv |
ISBN 90 5966 009 9 |
dc.rights.driver.fl_str_mv |
info:eu-repo/semantics/openAccess |
eu_rights_str_mv |
openAccess |
dc.format.none.fl_str_mv |
application/pdf |
dc.publisher.none.fl_str_mv |
Millpress, Rotterdam |
publisher.none.fl_str_mv |
Millpress, Rotterdam |
dc.source.none.fl_str_mv |
reponame:Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) instname:Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informação instacron:RCAAP |
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Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informação |
instacron_str |
RCAAP |
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RCAAP |
reponame_str |
Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) |
collection |
Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) |
repository.name.fl_str_mv |
Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) - Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informação |
repository.mail.fl_str_mv |
|
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1799136869722619904 |