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Analysis of rainstorm-induced slide-debris flows on natural terrain of Lantau Island, Hong Kong
Fuchu, D; Lee, CF; Wang, SJ
1999-02-01
Source PublicationENGINEERING GEOLOGY
Volume51Issue:4Pages:279-290
AbstractLantau Island, the largest outlying island of the territory of Hong Kong, experienced a severe rainstorm on 4-5 November 1993, which induced > 800 slope failures on natural terrain there. Detailed field investigations were carried out to study the failure modes, in relation with various influencing factors, It was found that the occurrence of slide-debris flows has a dose relationship with bedrock geology, slope gradient, vegetation cover and micro landform. The failure modes of slide-debris flows may be classified into translational slides and rotational slides, and the former are predominant. Analysis of the hydrological response of colluvial slopes during the rainstorm indicated that the majority of the failures were caused by the development of a perched water table in the thin surface layer of colluvium of volcanic origin due to infiltration during the heavy rain. Undisturbed soil samples from south Lantau have been subjected to anisotropically consolidated undrained compression tests at comparatively low stress levels. Constant deviatoric stress path tests (CQD) simulating the stress path in the field at in situ stress levels have been performed to investigate soil behavior. The CQD test results indicate that the material of slopes at undisturbed state is brought to dilation because of the increase in pore water pressure caused by infiltration of rain water. For a translational slide, the displacement, resulting from dilation, may destroy cohesion along the failure surface and locally within the interior of the slide. The surplus water during the intense rainstorm was able to equilibrate the reduction in pore pressure caused by dilation, and the dilation and displacement may be further increased. The strain-softening after significant strains triggered debris flow mobilization. However, for a rotational slide, the increase in pore water pressure caused by surplus water infiltration during the intense rainstorm could not equilibrate the reduction in pore pressure caused by dilation, much or even all of the sliding block could not mobilize into a debris flow. (C) 1999 Elsevier Science B.V. All rights reserved.
SubtypeArticle
KeywordColluvium Debris Flows Hong Kong Infiltration Landslides Rainfall
WOS HeadingsScience & Technology ; Technology ; Physical Sciences
WOS Subject ExtendedEngineering ; Geology
WOS KeywordSOILS
Indexed BySCI
Language英语
WOS SubjectEngineering, Geological ; Geosciences, Multidisciplinary
WOS IDWOS:000078814800003
PublisherELSEVIER SCIENCE BV
Citation statistics
Cited Times:87[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://ir.igsnrr.ac.cn/handle/311030/68200
Collection中国科学院地理科学与资源研究所
Corresponding AuthorFuchu, D
AffiliationChinese Acad Sci, State Key Lab Resources, Inst Geog, Beijing 100101, Peoples R China
Recommended Citation
GB/T 7714
Fuchu, D,Lee, CF,Wang, SJ. Analysis of rainstorm-induced slide-debris flows on natural terrain of Lantau Island, Hong Kong[J]. ENGINEERING GEOLOGY,1999,51(4):279-290.
APA Fuchu, D,Lee, CF,&Wang, SJ.(1999).Analysis of rainstorm-induced slide-debris flows on natural terrain of Lantau Island, Hong Kong.ENGINEERING GEOLOGY,51(4),279-290.
MLA Fuchu, D,et al."Analysis of rainstorm-induced slide-debris flows on natural terrain of Lantau Island, Hong Kong".ENGINEERING GEOLOGY 51.4(1999):279-290.
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