The local variation of the overlying soils geotechnical properties in the karst susceptibility assessment
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ORIGINAL ARTICLE
The local variation of the overlying soils geotechnical properties in the karst susceptibility assessment Elena Drobinina1 · Tatyana Kovaleva2 · Anna Koriakina1 Accepted: 28 June 2020 © Springer-Verlag GmbH Germany, part of Springer Nature 2020
Abstract The technique of karst susceptibility assessment in the territory of Ust-Kishert village is presented. The environmental conditions of predominantly gypsum and carbonate–gypsum karst area are analyzed. The zonation map of karst cavities and crushed zones density is created. The distribution of the overlying soil geotechnical property values within the classes of different subterranean karst form density is carried out and presented in the form of histograms and distribution curves. The computer simulation of the soil stress condition is used to demonstrate that karst cavity affects the mechanical properties of the overlying soils and alters the initial stress in the soils. In our research, the anomalous values of the overlying soil geotechnical properties are applied as the indicators of the karst cavities and crushed zones location. The anomalous value intervals are determined by one-dimensional statistical analysis. The analysis of the overlying soil geotechnical properties is resulted in the integral model of karst susceptibility in the research area. Keywords Geotechnical properties · Susceptibility · Sinkhole · Subsidence · Cavity · Crushed zone · Overlying soil · Sulfate karst · Ust-kisert village
Introduction According to Gutiérrez et al. (2014), there are two types of predictive model of sinkhole formation: hazard models and susceptibility models. The hazard models represent quantitative probability estimation for a given zone and time interval of being affected by a sinkhole event. The relative probability of a sinkhole occurring in any specific place is provided by susceptibility models. Varnes (1984) holds a similar opinion relating to hazard. According to him, natural hazard means the probability of occurrence within a specified period of time and within a given area of a potentially damaging phenomenon. In the research, susceptibility models are represented. The study area is categorized by degree of danger of a sinkhole formation based on changes of the overlying soil geotechnical properties, such as soil density, friction angle * Elena Drobinina [email protected] 1
Laboratory of Prognostic Modeling in Geosystems, Perm State University (PSU), Perm, Russia
Faculty of Geology, Perm State University (PSU), Perm, Russia
2
and cohesion. In terms of this research, the changes of the soil properties are believed to be indicators karst cavities and crushed zones existence in bedrock.
Theoretical statements and geological model of research Karst landforms develop especially in carbonate rocks, but also in gypsum (Gutiérrez and Cooper 2013). The rate of limestone dissolution is negligible at a human time scale. Sinkholes are associated with old pre-existing cavities formed in the geological past that have become unstable
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