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能量积聚程度及积聚位置是判别冲击矿压是否发生的2个重要参数,据此提出了评价冲击矿压危险性的能量密度准则。运用LS-DYNA模拟了扰动载荷作用下巷道围岩的能量积聚过程及应力波强度对冲击矿压危险程度的影响,得到了一定围岩应力状态下巷帮围岩能量积聚的大小、位置及能量密度因子等结果。模拟研究表明:1)随扰动强度pmax的增加,能量积聚区总体向外扩张,范围增大,且能量积聚区逐步向巷道边缘位置移近;当pmax由5 MPa至20 MPa变化时,巷道围岩能量积聚区最大能量密度Udmax由2.007 MJ/m3增至3.981 MJ/m3,增幅达到198%。2)受扰动影响,能量积聚区逐步向巷道边缘位置移动,能量密度因子值增大,k值由1.384 MJ/m4增至4.976 MJ/m4,增幅达到259%,发生冲击矿压的危险性显著提高。
The energy accumulation and accumulation location are two important parameters to judge whether rockburst occurs or not. According to this, the energy density criterion for evaluating the rockburst pressure is put forward. Using LS-DYNA to simulate the energy accumulation of surrounding rock and the effect of stress wave intensity on the rock burst pressure, the magnitude, location and energy of surrounding rock mass accumulation under the condition of surrounding rock stress are obtained. Density factor and other results. Simulation results show that: 1) With the increase of disturbance intensity pmax, the energy accumulation zone expands outward and expands in scope, and the energy accumulation zone gradually moves closer to the edge of the roadway; when pmax varies from 5 MPa to 20 MPa, The maximum energy density of rock energy accumulation area Udmax increased from 2.007 MJ / m3 to 3.981 MJ / m3, an increase of 198%. 2) Affected by the disturbance, the energy accumulation zone gradually moved to the edge of the roadway, and the energy density factor increased, and the k value increased from 1.384 MJ / m4 to 4.976 MJ / m4, an increase of 259%. The risk of rock burst was significant improve.