摘要
条带开采孤岛煤柱和采空区上覆岩层离层位置的确定是计算孤岛煤柱支承压力以及进行孤岛煤柱可开采性研究的前提。根据孤岛煤柱上覆岩层能否形成离层结构,提出孤岛煤柱支承压力的"有源"和"无源"计算模型,以应力准则和挠度准则判定孤岛煤柱上覆岩层离层位置,进而求得孤岛煤柱所承受地层重力并定义孤岛煤柱整体冲击失稳率,最后结合孤岛煤柱冲击地压发生可能性指数诊断法,对孤岛面的整体冲击失稳危险性和可开采性进行判定。经工程实例验证,该方法是合理可行的。
Determination of separation position in overlying strata of isolated coal pillars and gobs is the premise of abutment pressure calculation and recoverability of isolated coal pillars in skip mining mines. This paper proposed ＂source＂ and ＂non-source＂ models for abutment pressure calculation ac- cording to separation structure determined by the stress and deflection criteria. The overall burst-instability ratio was defined based on the force applied to the coal pillars. Finally, the possibility of overall burst-instability accidents and recoverability of isolated coal pillars were decided by index di- agnosis method of rockburst occurrence possibility. As verified through engineering examples, the re- suits are suitable for site application.
出处
《采矿与安全工程学报》
EI
CSCD
北大核心
2016年第5期867-872,879,共7页
Journal of Mining & Safety Engineering
基金
国家重点基础研究发展计划(973)项目(2010CB226800)
国家自然科学基金项目(51274022)
关键词
孤岛煤柱
冲击地压
离层
挠度
整体冲击失稳率
isolated coal pillar
rockburst
separation
deflection
overall burst-instability ratio
