The study of dynamics of development of deformation processes and crack formation in the rock massif around the working which is supported under a longwall

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Authors:

I.G. Sakhno, Cand. Sci. (Tech.), Associate Professor,State Higher Educational Institution “Donetsk National Technical University”,Senior Lecturer of the Mining Department, Donetsk, Ukraine

N.N. Malysheva, State Higher Educational Institution “Donetsk National Technical University”, Assistant Lecturer of the Mining Department, Donetsk, Ukraine

V.Ye. Nefedov, State Higher Educational Institution “Donetsk National Technical University”, Assistant Lecturer of the Department of Mining Geomechanics, Donetsk, Ukraine

Abstract:

Purpose. Study of dynamics of development of deformation processes and crack formation in the rock massif around the working which is supported under longwall, with different time of putting into operation of protective facilities.

Methodology. By means of simulation using equivalent materials we have investigated the rock massif deformation and cracking around the working supported under longwall with different time spent on putting into operation of the protective facilities.

Findings. This paper presents a protection method with fast putting into operation of the protective facilities. In laboratory conditions we have obtained a positive effect of the proposed method application.

Originality. It was shown that the time spent on putting into operation of the protective facilities has a significant influence on the deformation of the rock massif; place of location and development path of cracks.Growth of the main crack in the roof is caused by its subsidence, and determines the stress on the tunnel and its deformation. We have determined the time and place of localization and development of the main crack, which causes the collapse of main roof console under different time of putting into operation of the protective facilities.

Practical value. Use of the proposed protection method with fast putting into operation of the protective facilities eliminates the roof stratification and inrush over the protective facilities into working; creates conditions for the occurrence of the main crack over the protective facilities and its development in the direction of mined-out area. Broken-down rock of the main roof shifts its weight on the immediate roof rocks over the open area of longwall, this also lowers the load on the support and lining of working, which reduces the load on the protective facilities and provides more stable state of working.

References:

1. Синтез комбинированных охранных систем для поддержания подготовительных выработок в сложных горно-геологических условиях / А.В. Агафонов, О.Д. Кожушок, Е.Н. Халимендиков, Л.В. Прохорец // Геотехническая механика. – Днепропетровск-Симферополь, 2008. – Вып.78. – С. 73–86.

Agafonov, A.V., Kozhushok, O.D., Khalimendikov, Ye.N. and Prokhorets, L.V. (2008), “Synthesisof combined security systems for maintaining of development workings in challenging geological conditions”, Geotekhnicheskaya Mekhanika, Dnepropetrovsk, Simferopol, Issue 78, pp. 73–86.

2. Малышева Н.Н. Повышение эффективности охраны горных выработок за счет активного распора охранного сооружения / Н.Н. Малышева, И.Г. Сахно // Вісті Донецького гірничого інституту. – 2012. – №1(30). – С. 299–304.

Malysheva, N.N. and Sakhno, I.G. (2012), “Efficiency improvement of a mine opening protection through active stressing of protective facilities”, Visti Donetskoho Hirnychoho Instytutu, no. 1(30), pp. 299–304..

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ISSN (print) 2071-2227,
ISSN (online) 2223-2362.
Journal was registered by Ministry of Justice of Ukraine.
Registration number КВ No.17742-6592PR dated April 27, 2011.

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