针对回采巷道内高冒顶风险区域无法及时发现、辨别的难题,建立了顶板岩层稳定跨距判别公式,结合现场工程实践,分析在考虑多影响因素的条件下,不同岩性、结构组合的顶板岩层稳定性,得出巷道冒顶隐患级别区划。结果表明,同一巷道不同区域冒顶隐患级别不同,以稳定岩层层位作为划分顶板冒顶隐患级别的指标分成Ⅰ、Ⅱ、Ⅲ、Ⅳ共4级;试验巷道顶板的整体稳定性属中等,以Ⅱ级区域为主,占巷道长度的77.76%,冒顶隐患级别最高Ⅳ级区域位于巷道668—740 m间,占9.47%,该段发生冒顶事故的概率较高,属于需要进行重点监控的区域。

According to the problem too hard on time to find and identify the high roof falling risk area in the mining gateway,a stable span identification formula of t he roof strata was established.In combination with the site engineering practices, the paper analyzed the stability of the roof strata with different lithology and structure C ompositions in consideration of the multi factors. The roof falling hidden danger division of the gateway was obtained.The results showed that in a different area of the s ame gateway,the roof falling hidden grade would be different. Taking the stable rock stratum layer as the index of the roof falling hidden danger grade,the index could be divided into four grades,as I , I , m and IV.The integrated stability of the roof in the test gateway was medium and would be I grade area mainly which was taken 77.7 6% of the total length of the gateway.The highest IV grade area of the roof falling hidden grade was located in 668- -740 m of the gateway,which was taken 9.47% of the total length of the gateway.In this section,the possibility of the roof falling accident occurred would high and the section should be a key monitoring and measuring area.

国家重点基础研究发展计划(973计划)资助项目(2011CB201204)；中央高校基本科研业务专项资金资助项目(2009QZ01,2011YZ06)；