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Advancing slope stability assessment in weathered metamorphic terrains: a probabilistic approach utilizing the SSPC method on Highland Complex, Sri Lanka

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Abstract

Rock slope failure along road cuts in weathered elevated terrains is a frequent geotechnical issue. The slope stability probability classification (SSPC) system is commonly employed as a reliable, systematic, quick, and probabilistic approach to analyze rock slope failures. The applicability of this technique on weathered metamorphic rock slopes, particularly in high-grade metamorphic terrains like Sri Lanka, has been poorly studied. This study utilized 22 road cuts made in metamorphic rock masses along Kandy-Randenigala and Kandy-Mahiyangana roads in Sri Lanka. The SSPC system was applied to evaluate the stability of cut slopes, and the geotechnical properties of the rock masses were calculated. The slope stability probabilities were validated against the actual stability conditions of the slopes. Rock mass rating (RMR) and Geological Strength Index (GSI) analyses were employed to compare the rock mass properties derived from SSPC. The orientation-dependent analysis of SSPC agreed with the actual stability conditions of the analyzed cut slopes by 91%, except for wedge failures. The rock mass cohesion values and friction angles were derived from SSPC aligned with the literature and were reliable for weathered metamorphic rock masses in Sri Lanka. The current study recommends the SSPC orientation-dependent analysis for conducting a rapid and preliminary assessment of slope stability in structurally controlled weathered metamorphic terrains.

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Authors and Affiliations

  1. Department of Civil Engineering, University of Peradeniya, Peradeniya, Sri Lanka

    H. S. Lasantha & A. M. R. G. Athapaththu

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  1. H. S. Lasantha
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  2. A. M. R. G. Athapaththu
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Correspondence to H. S. Lasantha.

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Lasantha, H.S., Athapaththu, A.M.R.G. Advancing slope stability assessment in weathered metamorphic terrains: a probabilistic approach utilizing the SSPC method on Highland Complex, Sri Lanka. Bull Eng Geol Environ 83, 54 (2024). https://doi.org/10.1007/s10064-024-03546-8

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