煤巷复合顶板岩层失稳判别方法与冒顶隐患分级

Distinguishing Method of Strata Instability and Classification of Roof Fall Hidden Danger of Coal Roadway Composite Roof

针对同一巷道不同区域复合顶板垮落问题,建立了巷道复合顶板岩层过梁结构力学模型,获取巷道顶板岩梁破断失稳形态和极限条件,提出了巷道复合顶板岩层失稳判别方法,探讨了巷道复合顶板破坏失稳与岩层定量关系影响因素,建立了巷道复合顶板冒顶隐患级别划分指标体系,给出了隐患分级方法,将巷道冒顶高度作为冒顶隐患的分级指标,开发了巷道复合顶板稳定性判别软件,掌握了石圪台矿2-2煤顶板冒顶隐患级别区划特征,给出了基于巷道冒顶隐患分级的回采巷道顶板支护参数设计方案,实现差异化支护设计的同时,减少支护材料浪费,降低高冒风险巷道的事故发生概率。

Aiming at the composite roof fall at different regions of the same roadway,we established mechanics model of lintel structure of fracture instability of roadway composite roof,put forward the distinguished method of instability of roadway composite roof strata,discussed affecting factors of quantitative relationship between roadway composite roof fracture instability and strata,and accessed instability forms and limit conditions of rock beam fracture of roadway roof,then established the division index system of roof fall hidden danger level of roadway composite roof,put forward the method of hidden danger classification.The height of roadway roof fall was taken as classification index of roof fall hidden danger,and developed stability distinguished software of roadway composite roof,mastered zoning characteristics of roof fall hidden danger level of 2^-2 coal in Shigetai Mine,gave roof support parameters design of mining roadway based on hidden danger classification of roadway roof fall.It realized differential support design,reduced waste of support material,and decreased the accident probability of roadway of high risk roof fall.