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High-intensity mining characteristics and its evaluation system of thick coal seam in China’s coalmines

Wen-bing G., Er-hu B., Da-ming Y.

Prace Instytutu Mechaniki Górotworu PAN

2018

T. 20, nr 2

147--158

With the transfer of coal mining strategy and the continuous improvement of mining technology and equipment, the high-intensity mining of thick coal seam has become an important development direction of China’s coal mining technology. High-intensity mining would cause worse strata and surface movement and deformation and environment effects than general geological and mining conditions due to its geological and mining factors. According to analyzing the status and definition of high-intensity mining in China’s coalmines, the main characteristics of high-intensity mining in thick coal seam were systematically studied from aspects of geological and mining conditions, panel sizes, technical equipment, face advance speed, production and efficiency, ratio of depth to thickness, overburden strata and ground surface destruction. Based on the theory of green mining, the main indexes and evaluation system of high-intensity mining had been established from the aspects of geological and mining factors and mining damage factors. Meanwhile, the analytic hierarchy process (AHP) was used to analyze the mining damage factors. The results demonstrate that geological and mining factors and mining damage factors are important parts of high-intensity mining of thick coal seam. Moreover, mining damage factors are an important characteristic that cannot be ignored in high-intensity mining of thick coal seam, and it can be used to determine whether the longwall mining face of coal mine is high-intensity mining, or judge and analyze the damage to buildings, overburden strata, ground surface and ecological environment. The research results provide theoretical and technical basis for safe and efficient green production, mining damage and protection in coalmine.

Doświadczenia KWK "Ziemowit" w zakresie doboru obudowy dla rozcinek ścianowych w warunkach grubego pokładu.

Niełacny P., Setlak K., Siodłak Ł.

Przegląd Górniczy

2008

T. 64, nr 2

20-28

Artykuł przedstawia sposób dochodzenia do wyboru optymalnej obudowy dla rozcinek ścianowych w warunkach grubego pokładu 209 KWK "Ziemowit". Wybór odpowiedniej obudowy umozliwił zmniejszenie przekroju wyrobiska przy zachowaniu koniecznej dla zbrojenia szerokości, zwiększeniu uległy również postępy drążenia. Na podstawie wyników pomiarów prowadzonych w warunkach in situ dokonano ocenę stateczności wyrobisk przy zastosowaniu obudowy ŁP ŁPrw. Wyniki pomiarów dołowych zachowania się wyrobiska przy zastosowaniu obudowy ŁPrw32/V32 potwierdzają obliczenia numeryczne przeprowadzone metodą różnic skończonych.

The selection way of the optimal support for the longwall face development under conditions of the thick seam 209 of the Hard Coal Mine "Ziemowit" is presented. The proper support selection enables reduction of working section at providing the necessary for armouring width and increas of drivage advance. On the basis of survey in situ results working stability evaluation at the support ŁP and ŁPrw use, is presented. The results of underground measurements of workings with support ŁPrw32/V32 behaviour confirm numerical calculations by the finite-difference method.