Assessment of stress concentration in neighborhood of karst voids during ore mining

The studies on karst are reviewed. The mechanisms of rock failure in neighborhood of karst voids and the procedures of the stability assessment in rock mass enclosing a karst void are discussed. Some investigations using the analytical, numerical and physical simulation methods using equivalent materials consider the interaction between a single roadway and a karst void. This article focuses on the stress–strain behavior of rock mass enclosing karst voids. The problem is formulated so that to assess the influence of karst on the stress–strain behavior of the enclosing rock mass. The karst void under analysis is large and has an irregular surface. The ore and rock mass enclosing the karst void is described using the linearly elastic isotropic model. The physical and mechanical properties of the disturbed rock mass are determined empirically. The analytical domain is a 3D space with a karst void, subjected to the action of the natural stress field. In this investigation, the irregular surface of the karst is simplified to an ellipsoid of the equivalent geometry. The investigation reveals the patterns of stresses from the surface irregularities of the karst void and equivalent ellipsoids in three mutually orthogonal cross-sections.

Keywords: karst void, karst, stress concentration factor, ore deposit, elastic model of medium, natural stress state, finite element method, numerical modeling, Abaqus CAE.
For citation:

Protosenya A. G., Veselova A. V., Kotikov D. A. Assessment of stress concentration in neighborhood of karst voids during ore mining. MIAB. Mining Inf. Anal. Bull. 2024;(2): 5-22. [In Russ]. DOI: 10.25018/0236_1493_2024_2_0_5.

Acknowledgements:
Issue number: 2
Year: 2024
Page number: 5-22
ISBN: 0236-1493
UDK: 622.2
DOI: 10.25018/0236_1493_2024_2_0_5
Article receipt date: 24.07.2023
Date of review receipt: 04.08.2023
Date of the editorial board′s decision on the article′s publishing: 10.01.2024
About authors:

A.G. Protosenya1, Dr. Sci. (Eng.), Professor, e-mail: Protosenya_AG@pers.spmi.ru, ORCID ID: 0000-0001-7829-6743,
A.V. Veselova1, Graduate Student, e-mail: veselova.nastia2015@yandex.ru, ORCID ID: 0009-0004-6450-183X,
D.A. Kotikov1, Cand. Sci. (Eng.), Head of Laboratory, e-mail: hromokot@list.ru, ORCID ID: 0009-0006-8445-2689, 
1 Empress Catherine II Saint-Petersburg Mining University, 199106, Saint-Petersburg, Russia.

 

For contacts:

A.V. Veselova, e-mail: veselova.nastia2015@yandex.ru.

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