The objective of this paper is to study the behavior of a low thick and low depth coal seam and the overburden rock mass. The mining method is room and pillar in retreat and partial pillar recovery. The excavation method is conventional drill and blast because of the small production. The partial pillar recovery is about 30% of the previous pillar size, 7 m × 7 m. The roof displacement was monitored during retreat operation; the surface movement was also monitored. The effect of the blasting vibration on the final pillar strength had been considered. Due to blasting, the pillar reduced about 20%. The consequence is more pillar deformation and roof vertical displacement. The pillar retreat and ground movement were simulated in a three-dimensional numerical model. This model was created to predict the surface subsidence and compare to the subsidence measured. This study showed that the remaining pillar and low seam reduce the subsidence that was predicted with conventional methods.
类型: 期刊论文
作者: Andre Zingano,Anderson Weiss
来源: International Journal of Mining Science and Technology 2019年01期
年度: 2019
分类: 工程科技Ⅰ辑
专业: 矿业工程
单位: Mining Engineering Department, University Federal of Rio Grande do Sul
分类号: TD82;TD327
页码: 51-57
总页数: 7
文件大小: 1405K
下载量: 26
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