摘要
陷落柱存在是矿井安全的重大威胁,陷落柱形成机理的关键是溶洞顶板的破坏和塌陷机制,运用薄板理论分析了溶洞顶板的应力分布,得到溶洞顶板破坏是由于周边裂纹扩展开始的,并产生岩块分离体.用极限平衡分析法得出了溶洞顶板分离体塌陷的判据.根据这些判据,分析了陷落柱的发生、发展及停止的过程,并用有限元方法验证了以上理论分析.
The collapse columns are a major threat to safety production of coal mines. The failure and collapse of the Karstic roof is the main reason for forming the collapse columns. Aiming at this situation, we analyzed the stress distribution of the karst roof by using the thin plate theory. The result shows that the failure of karst roof began with the spread of cracks around the roof and then formed some separated rock bodies. On the basis of this, the collapse criterion of karst roof was also obtained by using limit equilibrium analysis method. According to this criterion, we analyzed the process of forming, developing, and stopping of collapse columns, and, at last, theoretically verified it by using the finite element method.
出处
《采矿与安全工程学报》
EI
北大核心
2008年第1期82-86,共5页
Journal of Mining & Safety Engineering
基金
国家重点基础研究发展计划(973)项目(2006CB202205)
江苏省博士后科研资助计划项目
关键词
陷落柱
塌陷判据
形成机理
数值模拟
collapse column
collapse criterion
mechanism of formation
numerical Simulation
