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| Multistage separated-slopes and reversed-platforms stabilizing technology for spontaneous combustion coal gangue heaps |
| Chen Wenying1, Wang Xiaojun1, Xin Ya1, Wang Bing1, Mei Aoxue2, Wen Meijia2 |
| 1. School of Environmental and Resource Sciences of Shanxi University, 030006, Taiyuan, China;2. Shanxi Green Giant Environmental Science and Technology Ltd. , 030000, Taiyuan, China |
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Abstract Coal gangue heaps formed by refuse discharging system in coal mining process take a large proportion of industrial solid wastes in Shanxi, China. They occupy lots of land resources and cause various environmental problems such as spontaneous combustions and landslides. Conventional measures to control coal gangue heaps are costly and challenging. To keep coal gangue hills in a steady state, an integrated technology is needed which covers thoroughly extinguishing, burnback preventing, slope reinforcing and revegetation. For this purpose, we propose the technology of separated-slopes and
reversed-platforms of spontaneous combustion coal gangue heaps on the basis of summarizing the experience of actual engineering implementation and practical construction technology. It combines heap
shaping treatment based on the hypothesis of series data which consist of separated-slopes disposition pattern, the length of separated-slopes and the width of reversed-platforms etc. Here, separated-slope is the coal gangue slope separated along the contour into several slopes, and reversed-platform is the artificial terrace floor between two separated-slopes with the angles inwardly tilted for two degrees. Based on the studies above, we propose the theoretical model of spontaneous combustion coal gangue multistage separated-slopes and reversed-platforms stabilizing technology which has been practically tested in the real conditions of coal gangue on Mount. Nanping in Shanxi Province. Coal gangue heaps were reshaped into grading surfaces from top to bottom with separated-slopes and reversed-platforms. Considering the local precipitation, surface erosion, coal gangue slope and physical properties, the critical length of separated-slopes is 10 m. And the theoretical width of reversed-platforms is 2.5 m according to the width of construction machine, the depth of high temperature zones and the local topography. We also employed supporting facilities like drainage and water-storage system, flexible slope toes, microrelief, loess-gangue mixture and revegetation to ensure the slope stability. Our research has proved our proposed technology a locally adaptive, economical and effective solution in the issues of spontaneous combustion, burnback and hillside instability, and in the future, this model can be referenced when dealing with the coal gangue hill problems of the similar types.
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Received: 19 December 2014
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