Comparative assessment of slope stability along road-cuts through rock slope classification systems in Kullu Himalayas,
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ORIGINAL PAPER
Comparative assessment of slope stability along road-cuts through rock slope classification systems in Kullu Himalayas, Himachal Pradesh, India Rahul Khanna 1,2 & R. K. Dubey 1 Received: 18 May 2020 / Accepted: 22 October 2020 # Springer-Verlag GmbH Germany, part of Springer Nature 2020
Abstract Evaluation of stability of artificial slopes created due to road construction in the mountainous terrain is very important but often a neglected aspect. The safe execution of road-cut slopes depends upon the level of understanding achieved in defining the engineering behaviour of rock masses with respect to its deformation and mechanical attributes. Understanding the realistic response of the rock mass to excavation of rock strata requires proper analysis related to influence of structural elements on their continuous characterization for facilitating safe and economical development of cut slopes along the road sections. In this paper structurally and non-structurally controlled rock slope classification systems are implemented to undertake comprehensive evaluation of stability of road-cut slopes. The work carried out involves collection of various inputs in form of rock mass and discontinuity characteristics from ten cut slopes along a road section in Kullu area, Himachal Pradesh, India. Rock samples were collected from site and laboratory testing has been undertaken to determine the intact rocks strength. Beside these, the kinematic analysis was performed to illustrate the geometrical relationship between various joint sets and the slope face so as to determine their failure mechanism. Several rock mass classification systems developed for rock slope stability assessment are evaluated for known slope conditions. The stability assessment for all identified cut slopes is compared using slope mass rating (SMR), Qslope and slope stability rating (SSR) methods. Design charts proposed for various factor of safety values have been utilized to evaluate the stability of studied road-cut slopes. Finally, a slope wise comparison is made between the stable angles predicted by SSR with those recommended by Q-slope method. Keywords Slope stability . Rock mass classification . Slope mass rating (SMR) . Slope stability rating (SSR) . Q-slope . Kinematic analysis . Kullu Himalayas (India)
Introduction Likewise other mountainous terrains of the world, Himalayan region also constitute a complex network of roads which form a major mode of communication in the region. In India, with major infrastructure boast coming up during last few years, road network is rapidly growing in this highly vulnerable and
* R. K. Dubey [email protected] Rahul Khanna [email protected] 1
Indian Institute of Technology (Indian School of Mines), Dhanbad, India
2
NHPC, Faridabad, India
undulatory terrain. Road construction in mountainous regions requiring excavation for new alignment and widening purpose decline the stability of the slopes (Janardhana et al., 2018). With this fast growing network, problems of slope stability and slope
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