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Article: Stress-strain behaviour of a loosely compacted volcanic-derived soil and its significance to rainfall-induced fill slope failures

TitleStress-strain behaviour of a loosely compacted volcanic-derived soil and its significance to rainfall-induced fill slope failures
Authors
KeywordsResidual soil
Slope failures
Soil mechanics
Stress path
Triaxial tests
Issue Date1999
PublisherElsevier BV. The Journal's web site is located at http://www.elsevier.com/locate/enggeo
Citation
Engineering Geology, 1999, v. 53 n. 3-4, p. 359-370 How to Cite?
AbstractThe stress-strain behaviour of a soil is crucial to the recognition of the mechanism of slope failure. Triaxial tests, composed of isotropically consolidated drained (ICD) and undrained compression (ICU) tests and anisotropically consolidated constant deviatoric stress path (CQD) tests, were carried out with the aim of investigating the stress-strain behaviour of loosely compacted volcanic-derived soils. The fact that the critical states are the same for ICU, ICD and CQD tests may show that the critical state is independent of the above three stress paths. The critical state line, as defined in critical state soil mechanics, is obtained from the e-log p' and q-p' plots based on the results of the above tests. The initial state of the consolidated specimens at initiation of failure may be classified as dilative or contractive in the light of the locations of the soil state relative to the critical state line. For contractional soils, the increased pore water pressure generated by rainfall infiltration leads to a contractive failure in a drained manner, giving rise to high excess pore water pressure. The excess pore water pressure caused by contraction cannot be dissipated instantly, resulting in a decrease in the shear resistance of the soil. The failure process is rapid. The failed soil mass is prone to flow after failure under the action of gravity due to its high moisture content and inflow of surface runoff and rainwater. For dilational soils, the increased pore water pressure resulting from infiltration leads to dilation, which reduces pore water pressure and thus increases the shear resistance of the soil. However, continued rainfall infiltration may be able to equilibrate the reduction in pore water pressure caused by dilation and, therefore, the dilation or displacement can continue. In Hong Kong, volcanic-derived soil is characterized by high permeability. Both the high permeability of volcanic-derived soil and a shallow failure surface make it possible for the reduction in pore pressure to equilibrate relatively quickly. Therefore, the failure is also rapid, at least for poorly compacted fill slopes. | Triaxial tests, composed of isotropically consolidated drained (ICD) and undrained compression (ICU) tests and anisotropically consolidated constant deviatoric stress path (CQD) tests, were carried out with the aim of investigating the stress-strain behavior of loosely compacted volcanic-derived soils. The critical state line, as defined in critical state soil mechanics, is obtained from the e-log p′ and q-p′ plots based on the results of the tests. The initial state of the consolidated specimens at initiation of failure is classified as dilative or contractive in the light of the locations of the soil state relative to the critical state line.
Persistent Identifierhttp://hdl.handle.net/10722/71631
ISSN
2015 Impact Factor: 2.196
2015 SCImago Journal Rankings: 1.810
ISI Accession Number ID
References

 

DC FieldValueLanguage
dc.contributor.authorDai, Fen_HK
dc.contributor.authorLee, CFen_HK
dc.contributor.authorWang, Sen_HK
dc.contributor.authorFeng, Yen_HK
dc.date.accessioned2010-09-06T06:33:44Z-
dc.date.available2010-09-06T06:33:44Z-
dc.date.issued1999en_HK
dc.identifier.citationEngineering Geology, 1999, v. 53 n. 3-4, p. 359-370en_HK
dc.identifier.issn0013-7952en_HK
dc.identifier.urihttp://hdl.handle.net/10722/71631-
dc.description.abstractThe stress-strain behaviour of a soil is crucial to the recognition of the mechanism of slope failure. Triaxial tests, composed of isotropically consolidated drained (ICD) and undrained compression (ICU) tests and anisotropically consolidated constant deviatoric stress path (CQD) tests, were carried out with the aim of investigating the stress-strain behaviour of loosely compacted volcanic-derived soils. The fact that the critical states are the same for ICU, ICD and CQD tests may show that the critical state is independent of the above three stress paths. The critical state line, as defined in critical state soil mechanics, is obtained from the e-log p' and q-p' plots based on the results of the above tests. The initial state of the consolidated specimens at initiation of failure may be classified as dilative or contractive in the light of the locations of the soil state relative to the critical state line. For contractional soils, the increased pore water pressure generated by rainfall infiltration leads to a contractive failure in a drained manner, giving rise to high excess pore water pressure. The excess pore water pressure caused by contraction cannot be dissipated instantly, resulting in a decrease in the shear resistance of the soil. The failure process is rapid. The failed soil mass is prone to flow after failure under the action of gravity due to its high moisture content and inflow of surface runoff and rainwater. For dilational soils, the increased pore water pressure resulting from infiltration leads to dilation, which reduces pore water pressure and thus increases the shear resistance of the soil. However, continued rainfall infiltration may be able to equilibrate the reduction in pore water pressure caused by dilation and, therefore, the dilation or displacement can continue. In Hong Kong, volcanic-derived soil is characterized by high permeability. Both the high permeability of volcanic-derived soil and a shallow failure surface make it possible for the reduction in pore pressure to equilibrate relatively quickly. Therefore, the failure is also rapid, at least for poorly compacted fill slopes. | Triaxial tests, composed of isotropically consolidated drained (ICD) and undrained compression (ICU) tests and anisotropically consolidated constant deviatoric stress path (CQD) tests, were carried out with the aim of investigating the stress-strain behavior of loosely compacted volcanic-derived soils. The critical state line, as defined in critical state soil mechanics, is obtained from the e-log p′ and q-p′ plots based on the results of the tests. The initial state of the consolidated specimens at initiation of failure is classified as dilative or contractive in the light of the locations of the soil state relative to the critical state line.en_HK
dc.languageengen_HK
dc.publisherElsevier BV. The Journal's web site is located at http://www.elsevier.com/locate/enggeoen_HK
dc.relation.ispartofEngineering Geologyen_HK
dc.rightsEngineering Geology. Copyright © Elsevier BV.en_HK
dc.subjectResidual soilen_HK
dc.subjectSlope failuresen_HK
dc.subjectSoil mechanicsen_HK
dc.subjectStress pathen_HK
dc.subjectTriaxial testsen_HK
dc.titleStress-strain behaviour of a loosely compacted volcanic-derived soil and its significance to rainfall-induced fill slope failuresen_HK
dc.typeArticleen_HK
dc.identifier.openurlhttp://library.hku.hk:4550/resserv?sid=HKU:IR&issn=0013-7952&volume=53&spage=359 &epage= 370&date=1999&atitle=Stress-Strain+Behaviour+of+a+Loosely+Compacted+Volcanic-Derived+Soil+and+Its+Significance+to+Rainfall-Induced+Fill+Slope+Failuresen_HK
dc.identifier.emailLee, CF: leecf@hkucc.hku.hken_HK
dc.identifier.authorityLee, CF=rp00139en_HK
dc.description.naturelink_to_subscribed_fulltext-
dc.identifier.doi10.1016/S0013-7952(99)00016-2en_HK
dc.identifier.scopuseid_2-s2.0-0032781804en_HK
dc.identifier.hkuros49524en_HK
dc.relation.referenceshttp://www.scopus.com/mlt/select.url?eid=2-s2.0-0032781804&selection=ref&src=s&origin=recordpageen_HK
dc.identifier.volume53en_HK
dc.identifier.issue3-4en_HK
dc.identifier.spage359en_HK
dc.identifier.epage370en_HK
dc.identifier.isiWOS:000081602300010-
dc.publisher.placeNetherlandsen_HK
dc.identifier.scopusauthoridDai, F=7102055666en_HK
dc.identifier.scopusauthoridLee, CF=8068602600en_HK
dc.identifier.scopusauthoridWang, S=7410335510en_HK
dc.identifier.scopusauthoridFeng, Y=55184226000en_HK

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