稳定岩层层位与冒顶隐患级别关系

针对巷道顶板高冒顶风险区域难以发现、识别的问题,采用力学建模、SURFER软件绘图与RFPA数值模拟相结合的方法,研究了稳定岩层层位与冒顶隐患级别的关系.结果表明:稳定岩层层位可以作为冒顶隐患级别分划的指标,根据稳定岩层层位的不同可以及时判断出高冒顶风险区域,2 m、4 m和6 m为级别变化的临界距离,稳定岩层距巷道顶板小于2 m时,冒顶隐患级别为Ⅰ级;稳定岩层距顶板2～4 m为Ⅱ级;稳定岩层在4～6 m为Ⅲ级;稳定岩层层位在6 m以上时,冒顶隐患级别为Ⅳ级,此类顶板是需要进行重点监测的区域.该成果对巷道顶板安全管理具有指导意义.

Study on relationship between potential caving hazard level and stable rock layer position

In order to overcome the difficulty in identifying potential caving hazards in roadway roof,this study investigates the relationship between the levels of potential caving hazards and the situation of stable rock layer using the methods of mechanics modeling,SURFER mapping,and RFPA numerical simulation.The result shows that the position of stable strata could be a factor for classifying the levels of caving hazards.The high level caving hazards areas could be determined based on the different positions of stable rock layer.Critical values are 2 m,4 m and 6 m,where the level of caving hazards may vary.When the distance from the position of stable rock layer to the roadway roof is less than 2 m,the level of caving hazard is classified as ClassⅠ;when the distance is between 2 m and 4 m,the level is classified as Class Ⅱ;when the distance is between 4 m and 6 m,the level is classified as Class Ⅲ;when the distance is larger than 6 m,the level is classified as Class Ⅳ.In particular,the areas containing Class Ⅳ roofs should be monitored.These results provide some guidance for the safe management on roadway roof.