A gravity flow model of fragmented rocks in longitudinal sublevel caving of inclined medium-thick ore bodies

• Autorzy: Zhang Xiufeng , Tao Ganqiang , Zhu Zhonghua

Identyfikatory

DOI

10.24425/ams.2019.129367

Warianty tytułu

PL

Model przepływu fragmentów skalnych pod wpływem sił ciężkości przy eksploatacji podpoziomowej złoża rudy o średniej miąższości

• Języki publikacji: EN

Abstrakty

EN

The draw theory is the foundation for decreasing ore loss and dilution indices while extracting de-posits from mines. Therefore, research on draw theory is of great significance to optimally guide the draw control and improve the economy efficiency of mines. The laboratory scaled physical draw experiments under inclined wall condition conducted showed that a new way was proposed to investigate the flow zone of granular materials. The flow zone was simply divided into two parts with respect to the demarcation point of the flow axis. Based on the stochastic medium draw theory, theoretical movement formulas were derived to define the gravity flow of fragmented rocks in these two parts. The ore body with 55° dip and 10 m width was taken as an example, the particle flow parameters were fitted, and the corresponding theoretical shape of the draw body was sketched based on the derived equation of draw-body shape. The comparison of experimental and theoretical shapes of the draw body confirmed that they coincided with each other; hence, the reliability of the derived equation of particle motion was validated.

PL

Teorie dotyczące urabiania skał stanowią podstawę do działań mających na celu zmniejszenie wielkości strat rudy i wartości opisujących je współczynników w trakcie wybierania złóż. Dlatego też prowadzenie prac teoretycznych ma kluczowe znaczenie dla opracowania optymalnej strategii wybierania i poprawy ogólnej wydajności kopalni. Przeprowadzone eksperymentalne prace wydobywcze w wyrobiskach nachylonych prowadzone w warunkach laboratoryjnych wskazały celowość badania stref przepływu materiałów ziarnistych. Strefę przepływu podzielono na dwie części odpowiednio umiejscowione względem punktu demarkacyjnego na osi przepływu. W oparciu o teorie urabiania dla ośrodka stochastycznego wyprowadzono odpowiednie równania ruchu opisujące przepływ rozdrobnionego materiału skalnego w obydwu tych strefach pod wpływem sił ciężkości. Jako przykład rozpatrywano złoże rudy o nachyleniu 55° i szerokości 10 m, parametry przepływu cząstek skalnych zostały dobrane drogą dopasowania a prognozowany profil złoża wykreślono w oparciu o odpowiednie równania kształtu. Porównanie przewidywanego i rzeczywistego kształtu profilu złoża wykazało ich dużą zbieżność, tym samym potwierdzając wiarygodność opracowanego równania ruchu cząstek skał.

Słowa kluczowe

EN

ore draw; sublevel caving; stochastic medium draw theory; inclined medium-thick ore body; draw body

PL

eksploatacja rud; eksploatacja podpoziomowa; teoria urabiania ośrodka stochastycznego; nachylone złoże o średniej miąższości; profil złoża

• Wydawca: Instytut Mechaniki Górotworu PAN
• Czasopismo: Archives of Mining Sciences
• Rocznik: 2019
• Tom: Vol. 64, no. 3
• Strony: 533--546
• Opis fizyczny: Bibliogr. 46 poz., fot., tab., wykr.

Twórcy

autor

Zhang Xiufeng

• College of Resource and Civil Engineering, Northeastern University, Shenyang, Liaoning 110819, China
• School of Resource & Environment and Safety Engineering, University of South China, Hengyang, Hunan 421001, China

autor

Tao Ganqiang

• School of Resource & Environment and Safety Engineering, University of South China, Hengyang, Hunan 421001, China

autor

Zhu Zhonghua

• School of Resource & Environment and Safety Engineering, University of South China, Hengyang, Hunan 421001, China

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