Abstract
Landslide on a mountainous stretch of the National Highway is a serious concern because they hinder traffic. Anthropogenic activities in the large-scale excavation of the natural slope to expand the existing national highway can significantly alter the slope mass sliding properties. The present study examines the rock mass current geotechnical state and the locations of potential failures in the Imphal Jiribum national highway of (NH-37) in Manipur. Rock mass characterizations and uniaxial compression strength tests have been carried out for the entire study area. According to kinematic analysis and field observations, the study result reveals that the Nungkao landslide is unstable. Wedge collapses are dominant. The factor of safety for rock wedge failure mode has indicated stable conditions. Based on the plasticity index chart, soil samples collected from the site have lower moisture content, which indicates that the soil is of an inorganic origin. The negative (−ve) value of the liquidity index (−1.18) and the positive (+ve) value of the consistency index (3.03) infer that the slope materials remain in the solid-state or semi-solid state, which indicates the slope is stable. Safety factor calculation also shows stable soil slope conditions. However, frequent slides still occur in the area. Effective preventive measures are suggested to improve slope stability accordingly.
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Mohon Singh, K., Okendro, M. (2023). Geological and Geotechnical Studies of Nungkao Landslide Along Imphal-Jiribam National Highway, NH-37, Manipur, India. In: Thambidurai, P., Singh, T.N. (eds) Landslides: Detection, Prediction and Monitoring. Springer, Cham. https://doi.org/10.1007/978-3-031-23859-8_7
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