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The processes and mechanism of failure and debris flow initiation for gravel soil with different clay content
Chen, N. Sh.1,3; Zhou, W.1,2,3; Yang, Ch. L.1,2,3; Hu, G. Sh.1,2,3; Gao, Y. Ch.4; Han, D.5
Corresponding AuthorChen, NS
2010
Source PublicationGEOMORPHOLOGY
ISSN0169-555X
EISSN1872-695X
Volume121Issue:3-4Pages:222-230
SubtypeArticle
AbstractClay content can influence gravel soil mass failure and debris flow initiation significantly. But quantification of the clay content influence in the published literature is lacking. This paper describes the experiments carried out to explore soil mass failure and debris flow initiation with different clay contents. The whole process of gravel soil mass failure and debris flow initiation can be grouped into five phases: (i) infiltration excess runoff, (ii) fracture extending, (iii) initial slip, (iv) large-scale slip, (v) debris-flow triggering. In the experiments, when the clay content of soil mass is lower than 2.5%, no soil failure and debris flow are triggered. Only the soil masses with moderate clay contents (5-10%) show the clear processes of the five phases that need the shortest rainfall duration among different clay contents. Soil masses with high clay content (>10%) and low clay content (2.5-5%) need longer rainfall duration to cover the five phases for partially triggering soil failure and debris flows. Clay content is closely linked with the soil failure and debris flow initiation under rainfall. The key mechanism can be grouped into two reasons: (i) the clay particles absorb the moisture and dilate to fill the soil pores, and the content of the clay has a direct link with the filled pores, (ii) the gravel soil masses with different clay content differ in their structure. For the low clay content soil mass group (2.5-5%), the coarse grains of the gravel soil form large pores and saturated clay particles are too few to block most soil pores. As a result, pore water pressure of soil mass is released easily in the raining process. Therefore, inner friction holds strong and soil mass is hard to mobilize into slip and debris flows. On the other hand, for soil masses with high (>10%) clay contents, soil failure and debris flow are triggered under the aid of surface runoff flux to reduce the cohesion of the soil. Whereas, only for the soil masses with moderate clay contents (5-10%), large-scale soil failure and debris flow can be triggered within the shortest duration. In this case, the debris flow is of the form of "soil mechanics," which is triggered after soil masses slip and liquefaction. The others are of the form of "hydraulic mechanics." The experiments provide valuable evidence for quantifying clay content impact on gravel soil failure and debris flow initiation. Because they were carried out in a flume, the research results are applicable to the soil failure and debris flow initiation in bedrock gully situations. (C) 2010 Elsevier B.V. All rights reserved.
KeywordGravel Soil Mass Clay Content Pore Water Pressure Soil Mass Failure Debris Flow Slip
WOS HeadingsScience & Technology ; Physical Sciences
DOI10.1016/j.geomorph.2010.04.017
WOS Subject ExtendedPhysical Geography ; Geology
Indexed BySCI
Language英语
Quartile2区
TOP
WOS SubjectGeography, Physical ; Geosciences, Multidisciplinary
WOS IDWOS:000280915400007
Funding OrganizationChinese Academy of Sciences(KZCX2-YW-332) ; National Natural Science Foundation of China(40471012) ; West Light Foundation of the Chinese Academy of Sciences
Citation statistics
Cited Times:38[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://ir.imde.ac.cn/handle/131551/5582
Collection山地灾害与地表过程重点实验室
Affiliation1.Chinese Acad Sci, Inst Mt Hazards & Environm, Chengdu 610041, Peoples R China
2.Chinese Acad Sci, Grad Univ, Beijing 100093, Peoples R China
3.Chinese Acad Sci, Mt Hazard & Earths Surface Proc Key Lab, Chengdu 610041, Peoples R China
4.Minist Land & Resources, Chengdu Inst Geol & Mineral Resources, Chengdu 610041, Peoples R China
5.Univ Bristol, Dept Civil Engn, Bristol BS8 1TH, Avon, England
First Author Affilication中国科学院水利部成都山地灾害与环境研究所
Recommended Citation
GB/T 7714
Chen, N. Sh.,Zhou, W.,Yang, Ch. L.,et al. The processes and mechanism of failure and debris flow initiation for gravel soil with different clay content[J]. GEOMORPHOLOGY,2010,121(3-4):222-230.
APA Chen, N. Sh.,Zhou, W.,Yang, Ch. L.,Hu, G. Sh.,Gao, Y. Ch.,&Han, D..(2010).The processes and mechanism of failure and debris flow initiation for gravel soil with different clay content.GEOMORPHOLOGY,121(3-4),222-230.
MLA Chen, N. Sh.,et al."The processes and mechanism of failure and debris flow initiation for gravel soil with different clay content".GEOMORPHOLOGY 121.3-4(2010):222-230.
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