ANALYSIS OF ENGINEERING GEOLOGICAL CONDITIONS AND VARIABILITY OF FINE-GRAINED DEPOSITS NEAR SINKHOLES IN THE CARBONATE-SULFATE KARST AREAS 

E. V. Drobinina ^1,*, D. R. Zolotarev ^2,**

¹ Perm State University, ul. Bukireva, 15, Perm, 614068 Russia

² Karst-Control and Bank ProtectionLLC, ul. Sushchevskiival, 5, str. 3, Moscow, 3127018 Russia

*E-mail: alenadrobinina@yandex.ru
**E-mail: zolotarevdr@mail.ru

The paper deals with the analysis of engineering geological conditions in the carbonate and sulfate karst region with widespread surface karst landforms. Engineering geological conditions in the study area (Dobryanskii region, Perm krai) are scrutinized in detail. The areal variability of soil state within the karst fields is assessed on the basis of the analysis of two-dimensional point clouds describing the relationship between the considered property and the density of karst landforms. Special attention is paid to the sites not subjected directly to collapses. Groundwater discharge to fractured karstic horizon is controlled by karst sinkholes in the study area. The higher the amount of sinkholes per square unit (density) is, the more intensely infiltration goes, and also the post-sedimentation alteration of soil properties related to groundwater percolation to discharge areas. It is shown that with rising density of karst landforms immediately beyond the limits of these areas, variability of properties of the uppermost soil layer manifests the increasing soil density and decreasing the porosity coefficient, the natural moisture and the fine-grained fraction content. The ground moisture decreases with the rising density of sinkholes, which is due to high infiltration by fractures and high ground massif permeability.

Key words: overlying soil massif, variability of properties, physical properties, grain-size distribution, sinkholes, carbonate and sulfate karst

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