Estimation of active rockburst prevention effectiveness during longwall mining under disadvantageous geological and mining conditions

• Autorzy: Wojtecki Ł. , Konicek P.

Identyfikatory

DOI

10.1016/j.jsm.2016.04.003

• Języki publikacji: EN

Abstrakty

EN

Underground longwall mining of coal seams in the Upper Silesian Coal Basin is currently being carried out under increasingly difficult geological and mining conditions. Mining depth, dislocations and mining remnants are the main factors responsible for the most significant rockburst hazard, which can be minimized via the use of active and passive rockburst prevention. Active rockburst prevention in longwalls is usually based on blasting, in order to either destress local stress concentrations in the rock mass or to fracture the thick layers of strong roof rocks to prevent or minimize the impact of high energy tremors on excavations. The accurate estimation of active rockburst prevention effectiveness is particularly important when mining under disadvantageous geological and mining conditions, which are associated with high levels of this hazard. The efficiency of blasting applied for this purpose is typically evaluated from the seismic effect, which is calculated based on seismic monitoring data and the weight of the charged explosive. This method, as used previously in the Czech Republic, was adopted in the present study to analyze conditions occurring in a Polish hard coal mine in the Upper Silesian Coal Basin. Parameters of long hole destress blastings in roof rocks (torpedo blastings) from the face of the assigned longwall in coal seam no. 507 were correct a success according to the seismic effect method and corresponded to observations made in situ. The analytical method presented enables the rapid estimation of destress blasting effectiveness and could also be useful when determining appropriate active rockburst prevention.

Słowa kluczowe

EN

active rockburst prevention; de-stress blasting; seismic effect

PL

aktywna profilaktyka tąpaniowa; strzelania odprężające; efekt sejsmiczny

• Wydawca: Elsevier ; Główny Instytut Górnictwa
• Czasopismo: Journal of Sustainable Mining
• Rocznik: 2016
• Tom: Vol. 15, iss. 1
• Strony: 1--7
• Opis fizyczny: Bibliogr. 12 poz.

Twórcy

autor

Wojtecki Ł.

• Kompania Węglowa S.A., Oddział KWK “Bielszowice”, Poland

autor

Konicek P.

• Institute of Geonics, Department of Geomechanics and Mining Research, Czech Academy of Sciences, Czech Republic

Bibliografia

• Budryk, W. (1938). Rockburst phenomena and prevention of their effects (in Polish). Przegląd Gorniczo-Hutniczy, (12)
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• Dubinski, J., & Konopko, W. (2000). Rockbursts e Assessment, prediction and control e Working rules (in Polish). Katowice: Główny Instytut Górnictwa.
• Holecko, J., Ptacek, J., Takla, G., & Konecny, P. (1999). Rockbursts in the Czech part of the upper Silesian Coal Basin e features, theoretical models and conclusions for practice. In Proceedings 9th Int. Congress on Rock Mechanics, Paris; 25-28 August 1999 (pp. 1101-1104).
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• Konicek, P., Soucek, K., Stas, L., & Singh, R. (2013). Long-hole destress blasting for rockburst control during deep underground coal mining. International Journal of Rock Mechanics & Mining Sciences, 61, 141-153.
• Konopko, W. (1984). About rockbursts and associated phenomena in the USCB (in Polish). Bezpieczeństwo Pracy w Górnictwie, (4).
• Parysiewicz, W. (1966). Rockbursts in mines (in Polish). Katowice: Wydawnictwo “Śląsk”.
• Pelnar, A. (1938). Rockbursts in Ostrava-Karvina coalfield (in Czech). Hornický věstník, hornické a hutnické listy, 25-58.
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• Wojtecki, Ł., & Dzik, G. (2013). Characteristics of the focal mechanism of high-energy tremors occurring during longwall mining of coal seam 507 (in Polish). Przegląd Górniczy, 69(12), 17-22.

Uwagi

Opracowanie ze środków MNiSW w ramach umowy 812/P-DUN/2016 na działalność upowszechniającą naukę.