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Geometrical Tests of Powered Roof Support Positioning in a Longwall Complex

Szurgacz Dawid, Zhironkin Sergey, Trzop Konrad, Voth Stefan, Sobik Leszek, Cehlar Michal

Inżynieria Mineralna

2021

no. 2

177--182

A powered roof support protects people and equipment in the longwall from potential danger posed by the surrounding rock mass. The study to determine the position of the powered roof support was conducted in an active longwall. The research team made measurements of the geometric height of the powered roof support structure located in the longwall complex. The main objective of this study was to determine the position of the powered roof support in actual underground conditions. The analysis of the results provided data on whether the assumed height of the longwall was maintained during operation of the complex.

Inter gases as one of the ways to reduce the risk of endogenous fires in hard coal mines

Szurgacz Dawid, Sobik Leszek, Brodny Jarosław

Multidisciplinary Aspects of Production Engineering

2019

Vol. 2, Iss. 1

183--190

Endogenous fires are currently one of the most common threats in hard coal mines. They are very dangerous for the staff and can cause very large economical loses. Therefore, the scope of activities aimed at limiting the possibility of these fires and reduction of their consequences constantly broadens. The paper presents the results of research aimed at determining the efficiency of the ventilation system applied to reduce the risk of endogenous fires in the areas where inert gases are used. The calculations included carbon dioxide and nitrogen. Inertisation is one of the ways of combating endogenous fires. This method is included in the developed comprehensive method to reduce the possibility of these fires. The results obtained and the method developed and later applied, should have a significant impact on improving the safety of operations in the scope of occurrence and consequences of endogenous fires.