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Article: In situ rainfall infiltration studies at a hillside in Hubei Province, China

TitleIn situ rainfall infiltration studies at a hillside in Hubei Province, China
Authors
KeywordsGroundwater
Infiltration Test
Landslides
Slope Failure
Soil Suction
Unsaturated Flow
Issue Date2000
PublisherElsevier BV. The Journal's web site is located at http://www.elsevier.com/locate/enggeo
Citation
Engineering Geology, 2000, v. 57 n. 1-2, p. 31-38 How to Cite?
AbstractField infiltration tests were conducted at a hillside near the ship lock of the Three Gorges Dam in Hubei Province, China. The test site consists of residual soil and decomposed granite. The infiltration rate is estimated from the in situ tests to be 1.465-2.778 x 10-6 m s-1, depending on the initial water content. The rate at which the infiltration front moves down through the soil matrix within 2 m of the ground surface is estimated to be ca. 0.26 m day-1 on average. At the end of the in situ tests, the matric suction profiles show that the soil below a depth of 80 cm remained unsaturated, while the zone above was almost fully saturated. This finding was unexpected. The site was excavated after the test to examine the abnormal behaviour of the matric suction profiles in the depth. A relic joint was identified at a depth of 78 cm at an attitude almost parallel to the slope surface. It is surmised that the joint transmitted water laterally and limited further penetration of the wetting front. The water in the zone above the joint appeared to be 'perched'. This experiment indicates that, to describe thoroughly the infiltration process within a weathered jointed granite profile for slope engineering design purposes, a model based on the assumption of a uniform porous media is inadequate. The model should include the discontinuities. This is challenging since it requires field studies to identify the pattern and distribution of the joints. The implications of the experimental results on slope stability are discussed. The in situ tests provide important information for further studying groundwater seepage under rainfall conditions and a dewatering system design for the slope above the ship lock of the Three Gorges Dam in China. (C) 2000 Elsevier Science B.V. All rights reserved. | Field infiltration tests were conducted at a hillside near the ship lock of the Three Gorges Dam in Hubei Province, China. The test site consists of residual soil and decomposed granite. The infiltration rate is estimated from the in situ tests to be 1.465-2.778 × 10-6 m s-1, depending on the initial water content. The rate at which the infiltration front moves down through the soil matrix within 2 m of the ground surface is estimated to be ca. 0.26 m day-1 on average. At the end of the in situ tests, the matric suction profiles show that the soil below a depth of 80 cm remained unsaturated, while the zone above was almost fully saturated. This finding was unexpected. The site was excavated after the test to examine the abnormal behaviour of the matric suction profiles in the depth. A relic joint was identified at a depth of 78 cm at an attitude almost parallel to the slope surface. It is surmised that the joint transmitted water laterally and limited further penetration of the wetting front. The water in the zone above the joint appeared to be 'perched'. This experiment indicates that, to describe thoroughly the infiltration process within a weathered jointed granite profile for slope engineering design purposes, a model based on the assumption of a uniform porous media is inadequate. The model should include the discontinuities. This is challenging since it requires field studies to identify the pattern and distribution of the joints. The implications of the experimental results on slope stability are discussed. The in situ tests provide important information for further studying groundwater seepage under rainfall conditions and a dewatering system design for the slope above the ship lock of the Three Gorges Dam in China.
Persistent Identifierhttp://hdl.handle.net/10722/151038
ISSN
2015 Impact Factor: 2.196
2015 SCImago Journal Rankings: 1.810
ISI Accession Number ID
References

 

DC FieldValueLanguage
dc.contributor.authorZhang, Jen_US
dc.contributor.authorJiao, JJen_US
dc.contributor.authorYang, Jen_US
dc.date.accessioned2012-06-26T06:16:24Z-
dc.date.available2012-06-26T06:16:24Z-
dc.date.issued2000en_US
dc.identifier.citationEngineering Geology, 2000, v. 57 n. 1-2, p. 31-38en_US
dc.identifier.issn0013-7952en_US
dc.identifier.urihttp://hdl.handle.net/10722/151038-
dc.description.abstractField infiltration tests were conducted at a hillside near the ship lock of the Three Gorges Dam in Hubei Province, China. The test site consists of residual soil and decomposed granite. The infiltration rate is estimated from the in situ tests to be 1.465-2.778 x 10-6 m s-1, depending on the initial water content. The rate at which the infiltration front moves down through the soil matrix within 2 m of the ground surface is estimated to be ca. 0.26 m day-1 on average. At the end of the in situ tests, the matric suction profiles show that the soil below a depth of 80 cm remained unsaturated, while the zone above was almost fully saturated. This finding was unexpected. The site was excavated after the test to examine the abnormal behaviour of the matric suction profiles in the depth. A relic joint was identified at a depth of 78 cm at an attitude almost parallel to the slope surface. It is surmised that the joint transmitted water laterally and limited further penetration of the wetting front. The water in the zone above the joint appeared to be 'perched'. This experiment indicates that, to describe thoroughly the infiltration process within a weathered jointed granite profile for slope engineering design purposes, a model based on the assumption of a uniform porous media is inadequate. The model should include the discontinuities. This is challenging since it requires field studies to identify the pattern and distribution of the joints. The implications of the experimental results on slope stability are discussed. The in situ tests provide important information for further studying groundwater seepage under rainfall conditions and a dewatering system design for the slope above the ship lock of the Three Gorges Dam in China. (C) 2000 Elsevier Science B.V. All rights reserved. | Field infiltration tests were conducted at a hillside near the ship lock of the Three Gorges Dam in Hubei Province, China. The test site consists of residual soil and decomposed granite. The infiltration rate is estimated from the in situ tests to be 1.465-2.778 × 10-6 m s-1, depending on the initial water content. The rate at which the infiltration front moves down through the soil matrix within 2 m of the ground surface is estimated to be ca. 0.26 m day-1 on average. At the end of the in situ tests, the matric suction profiles show that the soil below a depth of 80 cm remained unsaturated, while the zone above was almost fully saturated. This finding was unexpected. The site was excavated after the test to examine the abnormal behaviour of the matric suction profiles in the depth. A relic joint was identified at a depth of 78 cm at an attitude almost parallel to the slope surface. It is surmised that the joint transmitted water laterally and limited further penetration of the wetting front. The water in the zone above the joint appeared to be 'perched'. This experiment indicates that, to describe thoroughly the infiltration process within a weathered jointed granite profile for slope engineering design purposes, a model based on the assumption of a uniform porous media is inadequate. The model should include the discontinuities. This is challenging since it requires field studies to identify the pattern and distribution of the joints. The implications of the experimental results on slope stability are discussed. The in situ tests provide important information for further studying groundwater seepage under rainfall conditions and a dewatering system design for the slope above the ship lock of the Three Gorges Dam in China.en_US
dc.languageengen_US
dc.publisherElsevier BV. The Journal's web site is located at http://www.elsevier.com/locate/enggeoen_US
dc.relation.ispartofEngineering Geologyen_US
dc.rightsEngineering Geology. Copyright © Elsevier BV.-
dc.subjectGroundwateren_US
dc.subjectInfiltration Testen_US
dc.subjectLandslidesen_US
dc.subjectSlope Failureen_US
dc.subjectSoil Suctionen_US
dc.subjectUnsaturated Flowen_US
dc.titleIn situ rainfall infiltration studies at a hillside in Hubei Province, Chinaen_US
dc.typeArticleen_US
dc.identifier.emailJiao, JJ:jjiao@hku.hken_US
dc.identifier.authorityJiao, JJ=rp00712en_US
dc.description.naturelink_to_subscribed_fulltexten_US
dc.identifier.doi10.1016/S0013-7952(99)00126-Xen_US
dc.identifier.scopuseid_2-s2.0-0034124489en_US
dc.identifier.hkuros55455-
dc.relation.referenceshttp://www.scopus.com/mlt/select.url?eid=2-s2.0-0034124489&selection=ref&src=s&origin=recordpageen_US
dc.identifier.volume57en_US
dc.identifier.issue1-2en_US
dc.identifier.spage31en_US
dc.identifier.epage38en_US
dc.identifier.isiWOS:000087678900003-
dc.publisher.placeNetherlandsen_US
dc.identifier.scopusauthoridZhang, J=7601337251en_US
dc.identifier.scopusauthoridJiao, JJ=7102382963en_US
dc.identifier.scopusauthoridYang, J=8871818900en_US

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