Research on the Relationship between Grain Composition and Repose Angle of Coal Gangue in Dongkuang Mine, Heshan City, Guangxi, China

• Published in: Journal of earth science (Wuhan, China) China), 2014-04, Vol.25 (2), p.309-314
• Main Authors: Tang, Zhaohui, Dong, Xinxin, Yang, Yue, Ma, Li
• Format: Article
• Language: English
• Subjects: Angle of repose; Biogeosciences; China; Cities; Coal; Coal mines; Coal mining; Earth and Environmental Science; Earth science; Earth Sciences; Gangue; Geochemistry; Geology; Geotechnical Engineering & Applied Earth Sciences; Grading; Grain; Grains; Inflection points; Mines; Reclamation; 中国西南地区; 休止角; 地质环境问题; 广西; 晶粒尺寸; 煤矸石堆; 颗粒组成; 鹤山市
• ISSN: 1674-487X; 1867-111X
• DOI: 10.1007/s12583-014-0414-x

Heshan, a city in Southwest China, has been built over an old coal mining area. Due to low level of reclamation, coal gangue had been stacked in large heaps and caused geological environ- mental problems. To facilitate designing management project of coal gangue, we made an investigation of the largest coal gangue heap in Dongkuang Mine of Heshan. Firstly, the grain composition of coal gangue was estimated through the sieving method, then the representative grading curve was drawn through the statistics method of coarse grain content, and lastly the relationship between the repose an- gle and grain grading was studied by piling up coal gangue with different mix proportion. The result indicates that there is a wider range of grain size in the upper part of coal gangue heap, and the repre- sentative grain grading is well graded and easy to be compacted as filling materials. Besides, the wavy relationship curve of repose angle and coarse grain content shows that the content of 70% is the infiec- tion point of ascent stage and 85% the inflection point of descent stage of the repose angle. What＇s more, the repose angle corresponding to the representative grading of coal gangue is approximately 38.4° and this has guiding significance for management project of coal gangue.