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Field monitoring of soil-moisture to understand the hydrological response of a road-cut slope.

Pradhan, S. and Toll, D.J. and Rosser, N.J. and Brain, M.J. (2020) 'Field monitoring of soil-moisture to understand the hydrological response of a road-cut slope.', in 4th European Conference on Unsaturated Soils (E-UNSAT 2020). , 01029. Field studies and engineering applications., 195

Abstract

Rainfall and slope-cutting for road construction are two key landslide causative factors in Nepal, but how they interact to cause failures is poorly understood. To improve understanding of the effects of cut slopes during rainfall, geotechnical investigations and field monitoring were conducted in a mountainous district, Sindhupalchowk, located in central Nepal. This paper presents the results of the field-investigations and the measurements of volumetric water content obtained from the sensors installed in the study-site. Field-based evidence suggests that the slope that was cut for road construction during the dry period remained stable due to the presence of soil suction, which imparted additional strength to the soil. At the start of the monsoon, infiltration of rainwater caused saturation of the soil at shallow depth, consequently causing loss of suction and reduction of the soil strength. The presence of the road-cut in the hillslope resulting in steeper slopes then promoted the failure. These observations suggest that the presence of road-cuts in the hillslopes can cause landslides even during non-exceptional rainfall events.

Item Type:Book chapter
Full text:(VoR) Version of Record
Available under License - Creative Commons Attribution.
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Status:Peer-reviewed
Publisher Web site:https://doi.org/10.1051/e3sconf/202019501029
Publisher statement:© The Authors, published by EDP Sciences. This is an open access article distributed under the terms of the Creative Commons Attribution License 4.0 (http://creativecommons.org/licenses/by/4.0/).
Date accepted:No date available
Date deposited:21 October 2020
Date of first online publication:16 October 2020
Date first made open access:21 October 2020

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