Integral Pattern of Bench Stability on all Adjacent Rock Of Open-Pit Mine in Solid Rocks

Author Name(s): Nikolay A. Godovnikov, Aleksander V. Konovalov, Vladimir A. Dunaev, Ignat M. Ignatenko
Author Email: godovnikov_na@geomix.ru

Abstract

The article presents the integrated image of bench stability across the entire adjacent pit area on the basis of a probabilistic method to predict the azimuth-angular parameters of cracks that limit the potential prisms of the pit bench collapse that are put in the final position, as well as those planned to be set to the limiting contour in the form of a software component as the part of the specialized geoinformation GIS system “Stability”.

The computer technology for the probabilistic prediction of the most frequently encountered types of the quarry pit deformation is developed: a wedge and a flat one. The efficiency of this technology is proved by the example of the Kovdorsky MPP (Russia, Murmansk region) by the means of the comparative analysis concerning the actual and probabilistic location of these types of deformations, which showed the confinement of bench deformations to the sections of the quarry, limited by the isolines of such deformations occurrence probability within 80-100%. This technology is applicable to any quarries in rock massifs.

Introduction

The main cause of quarry bench deformations in rock massifs are differently oriented fracture disruptions (cracks), which form potential prisms of collapse by themselves or in combination with each other at certain spatial relationships with the slopes and the berms of ledges. A prompt and a reliable prediction of potential collapse prisms is the basis for a safe conduct of open-cast mining.

The forecast of quarry ledge deformations consists in the obtaining of an integral picture of ledge stability along the adjacent pit area of ​​the quarry in the form of isolines for the probability of deformation manifestation. The development of sets for potential collapse prisms to develop the contours along them is carried out by the probabilistic method of forecasting in respect of their azimuthal-angular parameters [1, 2] realized as a software component of PF Stability as the part of the specialized geoinformation system GIS Stability [3, 4], developed on the basis of mining and geological GIS GEOMIX [5] and inheriting its functional possibilities. This computer technology is based on the following algorithm (Fig. 1).

Conclusions

  1. The authors of the article have developed and tested the technique and the computer technology of probabilistic forecasting concerning the position of potential deformations of ledges in rock massifs on the current quarry.
  2. The positive results of such approbation make it possible to recommend the use of this technology at any quarries in rock massifs.

References

[1] Dunaev V.A., Godovnikov N.A. Estimation and prognosis of quarry ledge stability in rock massifs on the basis of geoinformation technologies. – Mining information analytical bulletin-2014. – № 4. – pp. 134-137.

[2] Godovnikov A.N., Dunaev V.A. Probabilistic method for the prediction of pit ledge potential deformations in rock massifs. – Mining information analytic. bull. – 2015. – №5. – pp. 81-83.

[3] Certificate of state registration for the computer program № 2014619048 “Specialized geoinformation system Stability” (GIS Stability). 8.09.2014.

[4] Certificate of the database state registration №2014621557. The database of the specialized geoinformation system Stability. 18.11.2014.

[5] State registration certificate of the computer program №2004612469 “Mining and geological information system GEOMIX” (GIS GEOMIX). 9.11.2004.

[6] Godovnikov N.A., Dunaev V.A. Simulation modeling of pit ledge collapse prisms. – Scientific bulletins of the BelSU, series “Natural Sciences”, 2014, No. 17 (188), issue 28, pp. 148-153.

[7] Whitman RV (1984). Evaluating and calculated risk in geotechnical engineering: 7th Terzaghi Lecture. Journal of Geotechnical Engineering 110 (2), 145–188.

[8] Priest SD & Brown ET (1983). Probabilistic stability analysis of variable rock slopes. Transactions of Institution of Mining and Metallurgy, Section A: Mining Industry 92, A1–12.

[9] Kirsten HAD (1983). Significance of the probability of ailure in slope engineering. The Civil Engineer in South Africa 25(1).

[10] Swan G & Sepulveda R (2000). Slope stability at Сollahausi. In Slope Stability in Surface Mining (eds WA Hustrulid, KM McCarter & DJA Van Zyl), pp. 163–170. SME, Colorado.

[11] Sullivan TD (2006). Pit slope design and risk – a view of the current state of the art. In Proceedings of International Symposium on Stability of Rock Slopes in Open Pit Mining and Civil Engineering, Cape Town. South African Institute of Mining and Metallurgy, Johannesburg.

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