区段小煤柱破坏规律及合理尺寸研究

为了防止煤柱冲击地压现象、改善工作环境并提高回采率,采用现场观测法,分析了沿空掘巷小煤柱以及工作面煤体内应力变化、超前支承压力的影响范围,以及小煤柱煤巷变形破坏规律,并通过数值模拟分析了4种不同宽度煤柱的塑性区变化范围．结果表明,煤柱的破坏情况受煤柱宽度影响较大．小煤柱外边缘,即临近上区段采空区部分受回采影响已基本呈塑性状态;内边缘即靠近本区段煤体部分,在距工作面4m左右开始进入塑性破坏状态;煤柱宽度在6～8m之间时中部存在一定范围弹性核．适合崔庄煤矿条件合理区段煤柱宽度应为6～8m．     

Comprehensive evaluation weight-variable identification model of top coal caving effect and its application

Based on the theory of attribute identification, a weight-variable identification model was put forward on top coal caving effect in fully mechanized top coal caving face. Contribution value of all kinds of evaluation factor of the caving coal and waste were used to determine weight coefficient. And then comprehensively estimated it by the given credible degree value. This kind of method can not only classify for attribute identification, but also can classify it into sub-classification according to comprehensive score compositor that of the same attribute. The comprehensive estimate result of plane and solid caving experiments shows that the result is true, credible, simple and that is not only one of the effective method of theory study, but also can be regarded as a quantitative examine method of the top coal caving effect in scene.