Development of the landslide risk classification for natural and man-made slopes based on soil watering and deformation extent

Oleksandr Kovrov¹, Valerii Kolesnyk¹, Yurii Buchavyi¹

¹Dnipro University of Technology, Dnipro, 49005, Ukraine

Min. miner. depos. 2020, 14(4):105-112

https://doi.org/10.33271/mining14.04.105

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ABSTRACT

Purpose. To summarize and formalize the estimates of landslide risk levels based on the proposed classification of relevant environmental or man-made risks in the regions of Ukraine and local territories, including a gully-ravine network and man-made slopes of technology-related objects that represent certain environmental or man-made risk for residential areas.

Methods. To achieve the objective, the following methodological approaches have been applied: analysis of the literature regarding state-of-the-art research on the issues of landslide phenomena assessment and prediction at regional and local levels, zonal-statistical analysis of orographic data for the each region of Ukraine with calculations of the relief integral coefficients, methods for comprehensive evaluation of natural and man-made slopes stability with the con-sideration of their geometry, water saturation, geoclimatic conditions and technogenic impacts; methods of geomechanical assessment, environmental evaluation and forecasting of landslide risk in natural geosystems and man-made slopes based on the stability factor, and scientific generalization of landslide risks using mathematical models developed by the authors and proposed criteria for watering extent and soil deformation in natural and man-made slopes.

Findings. The five-level scale for evaluating landslide risk for natural and man-made slopes has been substantiated in terms of their stability control. The proposed landslide risk scale makes it possible to forecast reliably the geomechanical state of the rock mass depending on the values of the slope stability factor in changing geoclimatic conditions and substantiate effective anti-landslide engineering measures. Landslide risk classification of natural slopes according to the stability factor value has been proposed. The scale is recommended for assessing the stability of man-made slopes comprised of solid and bulk rocks and for forecasting the environmental risk from landslides resulting from emergency situations.

Originality.It has been proved that the number of landslides per unit of precipitation in a region with certain relief is a constant value. The dependences for determining the critical amount of precipitation that will cause a single landslide within the gully-ravine network depending on the specific area of the landslide- prone site and on the relief have been obtained.

Practical implications. The five-level classification scale of landslide risk for natural and technogenic slopes in respect to annual precipitations and relief coefficient has been substantiated. That helps forecast landslides and determine the level of environmental and technogenic risk inflicted therefrom.

Keywords: landslide, landslide risk, natural slopes, man-made slopes, classification of landslide risk levels

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