Experimental study for the particle size distribution of mine spoil pile cross section
Tóm tắt
The aim of the experiment is to analyze and view the distribution of gangue with different particle sizes in mine spoil pile cross section. According to the Dimensional method, ‘Pi’ theorem was employed first to abbreviate ten physical and mechanical parameters to three dimensionless groups, and then the similarity criterion and coefficient of the experiment were determined and calculated based on particle size distribution curve. The similarity model was designed and constructed to represent the process of the mine spoil pile. The profile of the final model shows that the small sized particles mainly compose the upper zone of the mine spoil pile, while the bottom of the pile is dominated by bigger sized particles, and the intermediate section presents a zigzag stripe cross-bedding structure which is composed by small-medium scale particles and medium-large scale particles. Each stripe has two critical angles: one is the angle in which gangue particles can maintain their stability condition, with approximate range from 24° to 26°; and the other is the angle in which particles can stop gliding downwards, approximately varying from 34° to 36°.
Tài liệu tham khảo
Chao K T, Wong R H C, Wu J J, 2002. Coefficient of restitution and rotational motions of rock fall impacts. International Journal of Rock Mechanics and Mining Sciences, 39(1): 69–77.
Duan Y H, Bai Z K, Zhao J K, 1999. The preliminary study on water properties of the weathered products of gangue in the shallow layers of gangue mountains in Shanxi Province. Journal of China Coal Society, 24(5): 533–537.
Duan Y H, Pang H H, Wang J H, 2001. The preliminary research of the variational characteristics of water content in the section of the weathered coal gobs in coal gob mountains in Yangquan City. Journal of Shanxi Agricultural University, 21(2): 125–127.
Dong Q, 2006. Accumulation form and stability analysis of waste dump in Chongqing area. Master’s Thesis, Chongqing University.
Leibiger H, 1964. Über die gesetzmäßigkeiten der bodenentmischung beim verkippen von mischöden in Braunkohletagebauen. Freiberger Forschungshefte, 1964, A309: 1–103.
Latif A, 1993. Die physikalischen Eigenschaften der Böden von Braunkohleabraumhalden in ihrer Wirkung auf die Begrünung and Erodiebarkeit. Ökologie und Umweltsicherung 4, Gesamthochschule Kassel, Witzenhausen: 238–239.
Liang Z B, 2008. Study on motion feature of rockfalls. Doctor’s Thesis, Chengdu University of Technology.
Liu Y P, Er L, Li G J, 2005. Falling rock movement characteristic and reinforcement measures of a high steep slope. Hydrogeology and Engineering Geology, 32(1): 30–33.
Liu H B, Hu Z Q, 1995. The study of characteristics and mechanics of weathering of gangue. Energy Environmental Protection, 19(6): 43–45.
Lu Q, Sun Y H, Zhai S K, 2003. Evaluation models of rockfall trajectory. Journal of Natural Disasters, 12(2): 79–84.
Clung D M, 1999. The encounter probability for mountain slope hazard. Canada Geotechnolog Journal, 36: 1 195–1 196.
Matschak H, 1969. Beiträge zur strukturforschung an tagebaukippen. tei. Rohdichteverteilung in Abhängigkeit Von der Fallhöhe und anderen Faktoren, 19: 287–293.
Xu L, 2006. Study on the characteristics of habitat succession and its evaluation of gangue pile from Fuxin mining area. Doctor’s Thesis, Beijing Forestry University.
Xu L P, Lu Y, Li J H, 1993. Experimental studies for the sliding fall of dividual bodies and its pile law. Explosion and Shock Waves, 13(1): 65–76.
Zang Y J, 2008. Characteristics of rain infiltration and its stability research of coal waste dump in mountainous area. Doctor’s Thesis, Chongqing University.