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Climatic hazard assessment in selected underground hard coal mines in Vietnam

Quan Truong Tien, Łuczak Rafał, Życzkowski Piotr

Inżynieria Mineralna

2019

R. 21, nr 2/2

156--164

The article discusses the possibility of improving the microclimate in underground hard coal mines in Vietnam. Vietnamese underground mines are shallow mines which extract coal deposits accumulated up to 500 m below ground. According to the current Vietnamese laws, coal deposits can be mined if air temperature does not exceed 30oC, although this rule is not always observed, especially during summer. This article analyses the impact of air parameters on the climatic conditions in headings and the use of the air temperature reduction method in selected underground mines in Vietnam.

Choice of powered roof support FAZOS-15/31-POz for Vang Danh hard coal mine

Skrzypkowski Krzysztof, Korzeniowski Waldemar, Duc Trung Nguyen

Inżynieria Mineralna

2019

R. 21, nr 2/2

175--182

The article presents the choice of a Polish powered roof support from FAMUR Group for the conditions of one of the hard coal mines in Vietnam. In the analytical calculations, the strength and structural parameters of the rock mass from the Vang Danh mine region were adopted. The longwall face is 93 m long and the thickness of the coal layer is equal 3 m. For the needs of the choice of support, the load of the longwall face determined and the capacity of the powered roof support were determined. On the basis of the permissible roof deflection method, the condition of excavation maintenance was characterized. In the calculations, it was assumed that the condition of using a powered roof support type FAZOS-15/31-POz, except in addition to complying of the working range and permissible value of longwall face inclination, is to ensure proper roof maintenance conditions, which are determined by the index of load capacity of the roof „g”.

Ispol’zovanie novyh funkcjional’nostej systemy monitoringa aerologiceskih opasnostej dla povysenia bezopasnosti v podzemnyh sahtah kamennogo ugla

Trenczek S., Wojtas P., Keller J.

Mechanizacja i Automatyzacja Górnictwa

2013

R. 51, nr 3

3--11

The article presents how the hazards occurring in mines affect the general safety level. The authors discussed the impact of the spontaneous fire hazard and rock burst hazard on the explosion hazard level. Then, the new method of complex and system-based monitoring of the co-existing hazards was described. This method takes into account simultaneous occurrence of the methane explosion and fire hazards, as well as rock burst and coal dust explosion hazards. Finally, the major tasks and functionalities of the monitoring system were presented.