浅部岩层冒顶隐患级别的数值模拟研究

Study on Numerical Simulation on Roof Falling Danger Grade of Shallow Depth Strata

为了找出浅部岩层类型与巷道顶板冒顶隐患级别的关系,采用RFPA软件,模拟不同类型岩层条件下的顶板岩层变形破坏特征。结果表明:浅部岩层的强度指标决定了巷道破坏范围,直接影响到巷道冒顶隐患级别,冒顶风险按照软—韧型、软—脆型、中硬—韧型、中等强度—中等刚度型、硬—韧型、硬—脆型岩层的次序降低;岩层刚度决定了顶板岩层的破坏形态,对冒顶隐患级别的影响权重小于岩石强度;对浅部岩层为硬—韧、硬—脆型顶板采用单一的锚杆支护即可保证巷道不发生冒顶事故。

In order find out the relationship between the type of the shallow strata and the roof falling danger grade of the mine roadway,RFPA software was applied to simulate the deformation and failure features of the roof strata under the conditions of different type rock strata.The results showed that the strength index of the shallow strata would determine the failure scope of the mine roadway and would directly influence the roof falling danger grade of the mine roadway.The roof falling risks would be reduced in a sequence from soft-tough type rock,soft-brittle type rock,medium hard-medium tough type rock,medium strength-medium rigidity type rock,hard-tough type rock to hard-brittle type rock.The rigidity of the rock strata would determine the failure type of the roof rock strata and would have a less weight affected to the roof falling danger grade than the rock strength.The shallow strata were hard-tough and hard-brittle type roof and the bolt support applied could ensure no roof falling accident occurred in the mine roadway.