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Hill slope instability of Nainital City,Kumaun Lesser Himalaya,Uttarakhand,India

Journal of Rock Mechanics and Geotechnical Engineering 2018年第2期10卷 280-289页

作者： nirvan sah Mohit Kumar Rajeev Upadhyay Som Dutt Department of Geology(CAS) Kumaun UniversityNainital263001India Wadia Institute of Himalayan Geology 33 General Mahadeo Singh RoadDehradun248001India

Nainital City of Kumaun Lesser Himalaya is prone to mass wasting processes during monsoon season,which mischievously triggers the hill slope instability in this region. Slate, dolomitic limestone, silty sandstone and rhythmite of the Krol Formation are the main rock types. The present study focuses on the investigation of slope stability in the region in terms of potential seismicity and landslide. Geological and geotechnical mapping indicates that the major portion of the area is characterized by slope wash materials and buildings. The combination of 3-4 joint sets with one random joint is the main structure at *** major geological structures of this area are Nainital lake fault passing from the center of the lake, Main Boundary Thrust at SW, and Khuriya Fault passing from the SE direction of Nainital City. This work finds that different types of discontinuities(e.g. joints and faults), overburden due to unplanned civil structures,and neotectonic activity in the vicinity of this ara affect the stability of the city. The slate forms the base of the city, dipping slightly towards the lake side along the NW direction, thus accelerating the instability of this area. Rock mass rating(RMR), slope mass rating, factor of safety(FOS) and graphical analysis of the discontinuity for slope kinematics indicate that the study area is a landslide-prone zone. This study can facilitate reducing the risk of human life, and contribute to the ongoing construction works in the area.

关键词： Hill slope instability Himalaya region Wedge failure Rock mass rating(RMR) Factor of safety(FOS)

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