Abstract
In covered karst areas, there are precursory signs of a preparing sinkhole formation. These signs are features of the overburden structure. In particular, they include suffosion decompaction zones of noncohesive soils over fissures and cavities in soluble rocks. The existence of such zones in a geological cross-section can be considered as a precursor of a karst-piping sinkhole formation. This paper presents a detailed description of this phenomenon studied using a laboratory physical modeling and in the natural conditions. The authors consider the principles of search and identification of suffosion decompaction zones on the basis of analyzing the spatial distribution of granulometric composition parameters of noncohesive soils in the lower part of the overburden.
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