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      • Karst Sinkholes and Subsidence: the Problem of Predicting Diameters

        ( Sergey Shcherbakov ) 대한지질공학회 2019 대한지질공학회 학술발표회논문집 Vol.2019 No.2

        Today's methods of direct investigations of soil massifs (drilling, geophysics) in conditions of covered karst are not allow with high precision determine age and mechanism of establishment of surface karst forms and also places of occurrence and dimensions of underground karst features (cavities, fractured zones). Such limitations in the ways of studying surface and subsurface karst forms essentially affects on the quality of prognosis of sizes of sinkholes and subsidence inherent at the moment of their occurrence. For increasing of authenticity of such prognosis should be simultaneously used different methods of estimations, based on both an investigation of dimensions of observed surface karst forms in situ and on studying of soil massifs behavior above karst cavity. The present practice of karst prognosis in different degrees applies next methods for estimation of sizes of surface deformations: a) expert method; b) probabilistic method; c) deterministic method; d) method of physical modeling. All of mentioned above methods has their own advantages and disadvantages and need to be fully integrated each other during karst deformations prognosis. In combination of prognostic methods should be maximum concerned natural and technogene conditions of karst development, such as: a) surficial karst distribution within researched territory; b) tectonic structures, geological and hydrogeological conditions of site with engineering zoning of geological section; c) project stage and level of responsibility of construction object. In the research has been offered the block-scheme of optimal integration of different methods for solution of engineering-karstological tasks in construction.

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