Influence of Pressure and Water Content on Loess Collapsibility of the Xixian New Area in Shaanxi Province, China

More than 40% area of the Xixian New Area is a loess deposit region, and most of the loess landform is tableland and terrace where the thickness of loess is very large. Therefore, loess collapsibility will be the most important geotechnical problem in future foundation investigation and construction...

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Autores:
Wang, Jiading
Ma, Yan
Guo, Qianyi
Chu, Di
Tipo de recurso:
Article of journal
Fecha de publicación:
2017
Institución:
Universidad Nacional de Colombia
Repositorio:
Universidad Nacional de Colombia
Idioma:
spa
OAI Identifier:
oai:repositorio.unal.edu.co:unal/63570
Acceso en línea:
https://repositorio.unal.edu.co/handle/unal/63570
http://bdigital.unal.edu.co/64016/
Palabra clave:
55 Ciencias de la tierra / Earth sciences and geology
Xixian New Area
loess collapsibility
wetting
pressure
initial collapse water content
Distrito especial de Xixian (China)
colapsabilidad de loess
humectación
presión
contenido de agua incial de colapso.
Rights
openAccess
License
Atribución-NoComercial 4.0 Internacional
id UNACIONAL2_49202d8399a58210bbf107eb3f093d43
oai_identifier_str oai:repositorio.unal.edu.co:unal/63570
network_acronym_str UNACIONAL2
network_name_str Universidad Nacional de Colombia
repository_id_str
dc.title.spa.fl_str_mv Influence of Pressure and Water Content on Loess Collapsibility of the Xixian New Area in Shaanxi Province, China
title Influence of Pressure and Water Content on Loess Collapsibility of the Xixian New Area in Shaanxi Province, China
spellingShingle Influence of Pressure and Water Content on Loess Collapsibility of the Xixian New Area in Shaanxi Province, China
55 Ciencias de la tierra / Earth sciences and geology
Xixian New Area
loess collapsibility
wetting
pressure
initial collapse water content
Distrito especial de Xixian (China)
colapsabilidad de loess
humectación
presión
contenido de agua incial de colapso.
title_short Influence of Pressure and Water Content on Loess Collapsibility of the Xixian New Area in Shaanxi Province, China
title_full Influence of Pressure and Water Content on Loess Collapsibility of the Xixian New Area in Shaanxi Province, China
title_fullStr Influence of Pressure and Water Content on Loess Collapsibility of the Xixian New Area in Shaanxi Province, China
title_full_unstemmed Influence of Pressure and Water Content on Loess Collapsibility of the Xixian New Area in Shaanxi Province, China
title_sort Influence of Pressure and Water Content on Loess Collapsibility of the Xixian New Area in Shaanxi Province, China
dc.creator.fl_str_mv Wang, Jiading
Ma, Yan
Guo, Qianyi
Chu, Di
dc.contributor.author.spa.fl_str_mv Wang, Jiading
Ma, Yan
Guo, Qianyi
Chu, Di
dc.subject.ddc.spa.fl_str_mv 55 Ciencias de la tierra / Earth sciences and geology
topic 55 Ciencias de la tierra / Earth sciences and geology
Xixian New Area
loess collapsibility
wetting
pressure
initial collapse water content
Distrito especial de Xixian (China)
colapsabilidad de loess
humectación
presión
contenido de agua incial de colapso.
dc.subject.proposal.spa.fl_str_mv Xixian New Area
loess collapsibility
wetting
pressure
initial collapse water content
Distrito especial de Xixian (China)
colapsabilidad de loess
humectación
presión
contenido de agua incial de colapso.
description More than 40% area of the Xixian New Area is a loess deposit region, and most of the loess landform is tableland and terrace where the thickness of loess is very large. Therefore, loess collapsibility will be the most important geotechnical problem in future foundation investigation and construction. To explore loess collapsibility in the Xixian New Area, we conducted the K0 compression test, based on the collapsibility mechanism, which has different combinations of pressure (0~1.2 MPa) and water content (4%~Sat). Based on the σ-ε curve under different water content, we calculated the generalised collapse settlement and collapsibility coefficient of every water content under every pressure by subtracting the relevant curve from the saturated curve, and analysed the cross action of pressure and water on loess compressibility. The results show that the average collapsibility level of the northern Xixian New Area is self-weight collapsible level Ⅱ, with a lower limit of 14 m. Compressibility of loess is proportional to pressure and water content. Under low water content, the collapsibility coefficient δs increased while the pressure increased, but under medium and high water content, δs will reach peak with increasing pressure and after that, δs will decrease until its value is close to constant. When under the same pressure, δs decreases when water content increases. If set the additional strain 1.5% as collapse start criterion, then the initial collapse pressure Pi will linear proportional to water content. The initial collapse water content wi will increase sharply when pressure increases under low pressure, but wi will reach a constant value of 26% when pressure is larger than 200 kPa. This consequence will be meaningful for future geotechnical investigation and design in the Xixian New Area.
publishDate 2017
dc.date.issued.spa.fl_str_mv 2017-10-01
dc.date.accessioned.spa.fl_str_mv 2019-07-02T21:54:38Z
dc.date.available.spa.fl_str_mv 2019-07-02T21:54:38Z
dc.type.spa.fl_str_mv Artículo de revista
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dc.type.driver.spa.fl_str_mv info:eu-repo/semantics/article
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dc.type.content.spa.fl_str_mv Text
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dc.identifier.issn.spa.fl_str_mv ISSN: 2339-3459
dc.identifier.uri.none.fl_str_mv https://repositorio.unal.edu.co/handle/unal/63570
dc.identifier.eprints.spa.fl_str_mv http://bdigital.unal.edu.co/64016/
identifier_str_mv ISSN: 2339-3459
url https://repositorio.unal.edu.co/handle/unal/63570
http://bdigital.unal.edu.co/64016/
dc.language.iso.spa.fl_str_mv spa
language spa
dc.relation.spa.fl_str_mv https://revistas.unal.edu.co/index.php/esrj/article/view/66106
dc.relation.ispartof.spa.fl_str_mv Universidad Nacional de Colombia Revistas electrónicas UN Earth Sciences Research Journal
Earth Sciences Research Journal
dc.relation.references.spa.fl_str_mv Wang, Jiading and Ma, Yan and Guo, Qianyi and Chu, Di (2017) Influence of Pressure and Water Content on Loess Collapsibility of the Xixian New Area in Shaanxi Province, China. Earth Sciences Research Journal, 21 (4). pp. 197-202. ISSN 2339-3459
dc.rights.spa.fl_str_mv Derechos reservados - Universidad Nacional de Colombia
dc.rights.coar.fl_str_mv http://purl.org/coar/access_right/c_abf2
dc.rights.license.spa.fl_str_mv Atribución-NoComercial 4.0 Internacional
dc.rights.uri.spa.fl_str_mv http://creativecommons.org/licenses/by-nc/4.0/
dc.rights.accessrights.spa.fl_str_mv info:eu-repo/semantics/openAccess
rights_invalid_str_mv Atribución-NoComercial 4.0 Internacional
Derechos reservados - Universidad Nacional de Colombia
http://creativecommons.org/licenses/by-nc/4.0/
http://purl.org/coar/access_right/c_abf2
eu_rights_str_mv openAccess
dc.format.mimetype.spa.fl_str_mv application/pdf
dc.publisher.spa.fl_str_mv Universidad Nacional de Colombia - Sede Bogotá - Facultad de Ciencias - Departamento de Geociencia
institution Universidad Nacional de Colombia
bitstream.url.fl_str_mv https://repositorio.unal.edu.co/bitstream/unal/63570/1/66106-369755-1-PB.pdf
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spelling Atribución-NoComercial 4.0 InternacionalDerechos reservados - Universidad Nacional de Colombiahttp://creativecommons.org/licenses/by-nc/4.0/info:eu-repo/semantics/openAccesshttp://purl.org/coar/access_right/c_abf2Wang, Jiadingedcb07e5-3e75-4971-83cd-29ed3ac9534c300Ma, Yan289f9637-1236-48d2-b1ee-3957be63ed6d300Guo, Qianyiff86ab2f-3e25-4647-8c18-317bf938727b300Chu, Di4d8cd5ff-fd3a-486b-bf2f-d130e8a1fdae3002019-07-02T21:54:38Z2019-07-02T21:54:38Z2017-10-01ISSN: 2339-3459https://repositorio.unal.edu.co/handle/unal/63570http://bdigital.unal.edu.co/64016/More than 40% area of the Xixian New Area is a loess deposit region, and most of the loess landform is tableland and terrace where the thickness of loess is very large. Therefore, loess collapsibility will be the most important geotechnical problem in future foundation investigation and construction. To explore loess collapsibility in the Xixian New Area, we conducted the K0 compression test, based on the collapsibility mechanism, which has different combinations of pressure (0~1.2 MPa) and water content (4%~Sat). Based on the σ-ε curve under different water content, we calculated the generalised collapse settlement and collapsibility coefficient of every water content under every pressure by subtracting the relevant curve from the saturated curve, and analysed the cross action of pressure and water on loess compressibility. The results show that the average collapsibility level of the northern Xixian New Area is self-weight collapsible level Ⅱ, with a lower limit of 14 m. Compressibility of loess is proportional to pressure and water content. Under low water content, the collapsibility coefficient δs increased while the pressure increased, but under medium and high water content, δs will reach peak with increasing pressure and after that, δs will decrease until its value is close to constant. When under the same pressure, δs decreases when water content increases. If set the additional strain 1.5% as collapse start criterion, then the initial collapse pressure Pi will linear proportional to water content. The initial collapse water content wi will increase sharply when pressure increases under low pressure, but wi will reach a constant value of 26% when pressure is larger than 200 kPa. This consequence will be meaningful for future geotechnical investigation and design in the Xixian New Area.Para estimar la colapsabilidad en Xixian se realizó el test de compresión (K0), de acuerdo con el mecanismo de colapsabilidad, con diferentes combinaciones de presión (0~1.2 MPa) y contenido de agua (4%~Sat). Basado en la curva σ-ε con diferentes contenidos de agua se calcularon los coeficientes de asentamiento y colapsabilidad a partir de substracción de la curva en condiciones de saturación y analizando los efectos de presión y contenido de agua. Los resultados muestran que el promedio de colapsabilidad por su propio peso para el área de Xixian es de nivel II, con un límite bajo de hasta 14 m. La compresibilidad de loess es proporcional a la presión y al contenido de agua. Con un bajo contenido de agua, el coeficiente de colapsabilidad (δs) se incrementó mientras la presión se aumentó; pero, con contenidos medios y altos de agua, el coeficiente de colapsabilidad alcanzó su pico con el incremento de la presión, y luego bajó para prácticamente estabilizarse. Bajo presión constante, la colapsabilidad descendió al aumentar el contenido de agua. Si se asume como criterio inicial de colapso (Pi) una deformación adicional de 1.5%, Pi es linealmente proporcional al contenido de agua. El contenido de agua inicial de colapso (wi) se incrementa drásticamente cuando la presión se eleva a baja presión, sin embargo, el contenido de agua alcanza un valor constante de 26 % cuando la presión es de más de 200 kPa. Estos resultados son significativos para la investigación geotécnica y el diseño estructural en Xixian.application/pdfspaUniversidad Nacional de Colombia - Sede Bogotá - Facultad de Ciencias - Departamento de Geocienciahttps://revistas.unal.edu.co/index.php/esrj/article/view/66106Universidad Nacional de Colombia Revistas electrónicas UN Earth Sciences Research JournalEarth Sciences Research JournalWang, Jiading and Ma, Yan and Guo, Qianyi and Chu, Di (2017) Influence of Pressure and Water Content on Loess Collapsibility of the Xixian New Area in Shaanxi Province, China. Earth Sciences Research Journal, 21 (4). pp. 197-202. ISSN 2339-345955 Ciencias de la tierra / Earth sciences and geologyXixian New Arealoess collapsibilitywettingpressureinitial collapse water contentDistrito especial de Xixian (China)colapsabilidad de loesshumectaciónpresióncontenido de agua incial de colapso.Influence of Pressure and Water Content on Loess Collapsibility of the Xixian New Area in Shaanxi Province, ChinaArtículo de revistainfo:eu-repo/semantics/articleinfo:eu-repo/semantics/publishedVersionhttp://purl.org/coar/resource_type/c_6501http://purl.org/coar/resource_type/c_2df8fbb1http://purl.org/coar/version/c_970fb48d4fbd8a85Texthttp://purl.org/redcol/resource_type/ARTORIGINAL66106-369755-1-PB.pdfapplication/pdf981803https://repositorio.unal.edu.co/bitstream/unal/63570/1/66106-369755-1-PB.pdff883d640cd499e67908775c5ba0de3ddMD51THUMBNAIL66106-369755-1-PB.pdf.jpg66106-369755-1-PB.pdf.jpgGenerated Thumbnailimage/jpeg7722https://repositorio.unal.edu.co/bitstream/unal/63570/2/66106-369755-1-PB.pdf.jpg7145aa61b3a5609fd92fab79c6cd4784MD52unal/63570oai:repositorio.unal.edu.co:unal/635702024-04-29 23:11:13.934Repositorio Institucional Universidad Nacional de Colombiarepositorio_nal@unal.edu.co