Scholarly record

THE SLIP SURFACE LOCATIONS OF DEEP BLOCK LANDSLIDES

Andrey Kazeev, German Postoev, Marat Kuchukov, Ksenia Fedotova

Abstract

The identification of the landslide preparation and development mechanisms is the key to the sustainable development of landslide and landslide-prone urban and mining areas. The understanding of the landslide preparation mechanism is necessary for landslide hazard and risk assessments and designing proper protection measures and monitoring. A new equation for calculation of a slip surface depth (of a landslide basis) was obtained, using slope morphological and soil strength parameters. A new elaborated approach for identification of critical states of native soil masses during the preparation of a landslide on natural and man-made slopes [3] is considered. The cases were considered with the landslide basis located below the toe of the slope (below the erosion basis) and when the slip surface comes out on the slope (so-called "hanging" landslides). The results of calculations were compared with the monitoring data (inclinometric), showing a good agreement. For example, the calculated depths of slip surfaces for deep landslide sites in Moscow coincide with depths identified by inclinometer measurements with accuracy of 1 m. The same results were obtained for the slope of Sura River with a «hanging» landslide. The elaborated equation can be implemented for deep block landslides, occurring in different engineering geological conditions, from weak soils (such as loams) to rocks (calcareous clays, limestone, etc.).

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