The study of stress state and nechanism of rock massif deformation upon the formation of technonatural karst collapses

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Abstract

The paper deals with the assessment of stress-strain state variation in rock massifs upon the formation of displacement moulds and surface sinkholes in the undermined areas of Verkhnekamskoe potassium salt deposit in Perm krai, Russia. Engineering geological conditions, as well as natural and technogenic factors influencing the development of hazardous geological processes are described by the example of one typical site of the deposit. Methodical issues of the development of geomechanical model for this site and compilation of finite-element calculation scheme with selecting calculation parameters of rock properties and boundary conditions of the calculation area are considered. Regularities in the variation of stress fields and rock massif deformations upon cutting mines at one depth are considered. The possible mechanisms of deformation and destruction of karstified rock massifs upon the formation of technonatural sinkholes on the earth surface are described. The results of the study are significant for predicting hazardous processes and undertaking protective measures.

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About the authors

Yu. A. Mamaev

Sergeev Institute of Environmental Geoscience, Russian Academy of Sciences

Author for correspondence.
Email: mamaev47ya@mail.ru
Russian Federation, Ulanskii per., 13, str.2, Moscow, 101000

A. N. Vlasov

Institute of Applied Mechanics, Russian Academy of Sciences

Email: iam@iam.ras.ru
Russian Federation, Leningradskii pr., 7, Moscow, 125040

M. G. Mnushkin

Sergeev Institute of Environmental Geoscience, Russian Academy of Sciences

Email: mamaev47ya@mail.ru
Russian Federation, Ulanskii per., 13, str.2, Moscow, 101000

A. A. Yastrebov

Sergeev Institute of Environmental Geoscience, Russian Academy of Sciences
 

Email: mamaev47ya@mail.ru
Russian Federation, Ulanskii per., 13, str.2, Moscow, 101000

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2. Fig. 1. Geomechanical model (in circles there are numbers of IGE): a - a geological section on the calculated area; b - the composition of the rocks of the Yuzhno-Yurchuksky area of the potassium salt deposit (compiled from materials of PJSC Uralkali and LLC Lukoil-Perm).

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3. Fig. 2. The finite element calculation scheme and its fragment for the Yuzhno-Yurchuksky part of the field (in circles, the local numbering of rocks).

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4. Fig. 3. Vertical displacements (precipitation) at different lengths of the horizon of salt workings (chambers): a - 2 chambers; b - 6 cameras; in - 8 cameras; g - 13 cameras.

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5. Fig. 4. Diagram of the mechanism and the dynamics of the formation of a dip in the mine BKPRU-1 (option 1).

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6. Fig. 5. Diagram of the mechanism and dynamics of the formation of a dip at the mine BKPRU-1 (option 2).

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