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Support loading of assembly chamber in terms of Western Donbas plough longwall

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Category: Mining

Last Updated on 13 November 2014

Published on 13 November 2014

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Authors:

Ye.A. Sdvizhkova, Dr. Sci. (Tech.), Professor, State Higher Educational Institution “National Mining University”, Head of the Department of Higher Mathematics, Dnipropetrovsk, Ukraine

D.V. Babets, Cand. Sci. (Tech.), Assoc. Professor, State Higher Educational Institution “National Mining University”, Senior Lecturer of the Department of Higher Mathematics, Dnipropetrovsk, Ukraine

A.V. Smirnov, Cand. Sci. (Polit.), Coal Production Director, Member of the Management Board DTEK Company, Ukraine

Abstract:

Purpose. To determine the changes of rock stress-strain state caused by constructing the assembly chamber and creating the excavation behind the longwall. Additional goal is to develop techniques for calculating the bearing capacity of assembly chamber support and consider the rock pressure increasing at the moment when longwall starts moving from the preparatory face.

Methodology. Stresses and displacements in rocks around assembly chamber and preparatory face are determined by finite element method based on elastoplastic deformation model. The procedure of strain accumulation is implemented at the sequential change of cavity size. Failure zones are determined according to the Hoek-Brown strength criterion. Mathematical statistics methods are used to build general regularities. In particular, the nonlinear estimation method combining the multiple regression and variance analysis is used.

Findings. Multi-variant calculations of rock stress-strain state are made for different values of rock strength, coal seam thickness, mining depth and excavation size as well. The results are generalized for different geological conditions. The failure zone height and excavation contour displacements are represented as a function of factors mentioned above.

Originality. The new regularities of strain increasing and failure zone spreading in rocks around the excavations are obtained considering the moment when the plough longwall starts moving. The formulas for determining the basic geomechanical characteristics are derived to design excavation support under various mining and geological conditions.

Practical value. The set of formulas determining the main geomechanical characteristics gives a simple techniques to calculate the necessary support capacity. It is the background for developing the standards of assembly chambers designing under conditions of the Western Donbass.

References:

1. Правила технічної експлуатації вугільних шахт: СОУ 10.1-00185790-002-2005.

Rules of technical operation in coal mines: SOU 10.1-00185790-002-2005.

2. Оценка устойчивости предварительно пройденной демонтажной камеры при различных формах ее поперечного сечения в условиях ПАО „ДТЭК Павлоградуголь“: міжн. наук.-техн. конф. „Форум гірників“ / [Мартовицкий А.В., Пилюгин В.И., Сдвижкова Е.А., Бабец Д.В.] – Дніпропетровськ: РВКНГУ.– 2012. – С. 129–138.

Martovitskiy, A.V, Pilugin, V.I., Sdvizhkova, O.O. and Babets, D.V. (2012), “Stability estimation of dismantling chamber with various forms of the cross-section in terms of PAO DTEC “Pavlogradugol”, Proc. of the International scientific conference “Forum of Mining Engineers”, National Mining University, Dnіpropetrovsk, pp. 129–138.

3. Hoek, E. (2002), Practical Rock Engineering, Institution of Mining and Metallurgy, London 325 p.

4. Шашенко О.М. Деформационные модели в геомеханике/ Шашенко О.М.,Сдвижкова О.О.,Гапеєв С.М.–Днепропетровск: НГУ, 2008 – 223 с.

Shashenko, O.M., Sdvizhkova, O.O. and Gapeev, S.N. (2008), Deformatsyonnye modeli v geomekhanike [Deformation Models in Geomechanics], NMU, Dnepropetrovsk, Ukraine.

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