Scholarly record

ABOUT THE MECHANISM OF A LIMIT STATE PREPARING IN A LANDSLIDE-PRONE MASS AND THE DISPLACEMENT OF A LANDSLIDE BLOCK AS AN ELEMENT OF A DISSIPATIVE STRUCTURE

German Postoev

Abstract

The landslide cycle of development of deep-seated landslides begins when a new landslide block is being separated from the bedrock mass. It completes when this landslide block is displaced to the level of a landslide terrace, situated on the landslide slope. The initial stress state in the bedrock mass with horizontal earth surface (before the landslide block forms) is regulated by the Mohr-Coulomb criterion. The appearing of a landslide cirque as well as the sliding basis causes the change in the initial stress state. The horizontally oriented dissipative block-structures appear. The concentration of principal stresses takes place along the boundary surfaces (of cylindrical shape) of these structures. The limit state is formed along these boundary surfaces of the appropriate block in the local zone of a soil mass (on the contact with the landslide cirque). The displacement occurs along the same surfaces, when the equilibrium is disturbed. In the process of formation of the limit state of a bedrock mass, the adjacent landslide mass (earlier separated landslide blocks) acts as an additional load (creates an active vertical stress from the landslide masses) to the horizon of the landslide basis. An interaction of the bedrock mass with the landslide slope takes place at the stage of preparing to a new block displacement. The limit state of a new landslide block occurs when the head scarp height on the slope reaches the critical value (Hcr). Under the weight of soil masses of a new landslide block, separated from the bedrock mass, the soil is being crushed at the bottom part of the block (along the slip surface) as it subsides. The paper considers the conditions of a new landslide block forming, the beginning of the process of a new landslide block displacement, the mechanism of interaction between the landslide block with the bedrock mass and the landslide body, which consists of earlier displaced landslide blocks. The paper also provides the explanation of the soil strength changes in the process of displacement and its significance in the landslide cycle completing, with comparing the results of theoretical and experimental researches.

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DOI resolver: doi.org/10.5593/sgem2019/1.2/s02.002

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