摘要
中国西部有一批获得正常经营权的小矿井。他们在采用长壁煤柱支撑法进行开采时,常发生大面积顶板垮落事故。文中结合陕北郭家湾煤矿的实例进行数值分析,研究顶板大面积垮落的机理,认为一定极限条件下在顶板作用下的支撑煤柱群产生大变形,引起顶板变形破坏并形成"六面体"。在"六面体"重压下煤柱群整体塌落,造成大面积顶板垮落。区分隔离煤柱和区内煤柱,选择合理开采参数,是防止灾变的关键。
Some fall of large area have happened during long wall mining in a small mine of the west region. Large area falling mechanism has been studied by numerical analysis of Guojiawan in North Shannxi. Large distortion at supporting mine pillars on roof force forms hexahedron and large area roof fall under stress within certain limit. Dividing partition coal pillars and region coal pillars, and selecting parameter are key to prevent disaster.
基金
陕西省重点实验室研究项目(02JS44)
陕西省教育厅重点项目(012c09)
