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Energies 2017, 10(12), 2082; doi:10.3390/en10122082

Modelling the Small Throw Fault Effect on the Stability of a Mining Roadway and Its Verification by In Situ Investigation

1
Faculty of Mining and Geoengineering, AGH University of Science and Technology, 30-059 Kraków, Poland
2
Tytan sp. z O.O. Mining Company, 41-400 Mysłowice, Poland
*
Author to whom correspondence should be addressed.
Received: 7 September 2017 / Revised: 27 November 2017 / Accepted: 30 November 2017 / Published: 7 December 2017
(This article belongs to the Section Energy Sources)
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Abstract

The small throw fault zones cause serious problems for mining engineers. The knowledge about the range of fractured zone around the roadway and about roadway’s contour deformations helps a lot with the right support design or its reinforcement. The paper presents the results of numerical analysis of the effect of a small throw fault zone on the convergence of the mining roadway and the extent of the fracturing induced around the roadway. The computations were performed on a dozen physical models featuring various parameters of rock mass and support for the purpose to select the settings that reflects most suitably the behavior of tectonically disturbed and undisturbed rocks around the roadway. Finally, the results of the calculations were verified by comparing them with in situ convergence measurements carried out in the maingate D-2 in the “Borynia-Zofiówka-Jastrzębie” coal mine. Based on the results of measurements it may be concluded that the rock mass displacements around a roadway section within a fault zone during a year were four times in average greater than in the section tectonically unaffected. The results of numerical calculations show that extent of the yielding zone in the roof reaches two times the throw of the fault, in the floor 3 times the throw, and horizontally approx. 1.5 to 1.8 times the width of modelled fault zone. Only a few elasto-plastic models or models with joints between the rock beds can be recommended for predicting the performance of a roadway which is within a fault zone. It is possible, using these models, to design the roadway support of sufficient load bearing capacity at the tectonically disturbed section. View Full-Text
Keywords: fault; roadway stability; roadway convergence; numerical calculations; in situ measurements fault; roadway stability; roadway convergence; numerical calculations; in situ measurements
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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Piotr, M.; Łukasz, O.; Piotr, B. Modelling the Small Throw Fault Effect on the Stability of a Mining Roadway and Its Verification by In Situ Investigation. Energies 2017, 10, 2082.

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