NDLI: Effects of bedrock anisotropy on hillslope failure in the Darjeeling-Sikkim Himalaya: an insight from physical and numerical models

Content Provider	Springer Nature Link
Author	Roy, Sujit Baruah, Amiya Misra, Santanu Mandal, Nibir
Copyright Year	2014
Abstract	This study investigates the role of bed-material anisotropy in triggering landslides in metamorphic terrains of the Darjeeling-Sikkim Himalaya. The initial disposition of foliation (planar anisotropy) with respect to the hillslopes is found to be a crucial parameter in controlling the scale of landslides. Hillslopes with foliation dipping into the surface slope are mostly affected by deeper-seated larger-scale landslides, as compared with those occurring on hills with down slope-dipping foliations. To verify our field observations, we performed scaled slope–failure experiments in a tilted sandbox, simulating the foliation anisotropy in analogue models. Sand–mica beds with the anisotropy planes dipping into the surface slope developed shear localisation along deep-penetrating listric zones, leading to slope failure in the form of down-sliding blocks of large dimensions. In contrast, models with anisotropic planes dipping down slope produced failure zones restricted to the shallow level. The narrow failure zones in the latter case had little tendency to grow in depth but propagated up the hillslope direction. Using Drucker–Prager’s failure criterion, we also ran experiments with finite element models to substantiate the contrasting effects of bed anisotropy on hillslope failure processes.
Starting Page	927
Ending Page	941
Page Count	15
File Format	PDF
ISSN	1612510X
Journal	Landslides
Volume Number	12
Issue Number	5
e-ISSN	16125118
Language	English
Publisher	Springer Berlin Heidelberg
Publisher Date	2014-08-28
Publisher Place	Berlin, Heidelberg
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Landslide Metamorphic terrain Foliation dip Shear localisation Sandbox experiments Finite element modelling Natural Hazards Geography (general) Agriculture Civil Engineering
Content Type	Text
Resource Type	Article
Subject	Geotechnical Engineering and Engineering Geology

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