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在两巷道的交叉段两支承压力区和顶板卸载区会发生相互叠加,因此,相对于巷道其他部位来说交叉段的围岩扰动范围会扩大,且导致变形加剧和原有支撑应力增加等不利于巷道稳定的情形出现。为分析地下采场巷道交叉段的稳定性,利用有限元数值模拟软件并考虑岩土体的应变软化特性,对5种具有代表性的交叉情形进行了数值模拟研究。研究结果表明:由于巷道交叉使得交叉几何中心附近的围岩变形进一步增加,不同的交叉角度对巷道交叉段的变形存在不同程度的影响,交叉角度越小,主巷(巷道1)锐角侧的变形越大,而且由于交叉角度的不同也使得交叉段主巷的顶板最大沉降区向锐角侧呈不同程度的偏移,交叉角度越小,偏移越为明显。从结果可以得出巷道2的变形同样也受到交叉角度的影响,从距离交叉中心4远的地方开始,交叉角度越小,巷道2的变形越大。研究成果可以为类似条件下的巷道设计和支护提供借鉴与参考。
The two bearing pressure zones and the roof unloading zone will overlap with each other at the intersection of the two tunnels. Therefore, the disturbance range of the surrounding rock of the intersecting section will be enlarged relative to other parts of the roadway, leading to the increased deformation and the increase of the original supporting stress, etc. Conducive to the stability of the roadway situation. In order to analyze the stability of the cross section of underground stope, five representative crossover scenarios were numerically simulated by using finite element numerical simulation software and taking into account the strain-softening characteristics of rock mass. The results show that the deformation of the cross section of the roadway has different degrees of influence due to the further increase of the surrounding rock deformation near the intersection geometric center due to the crossing of the roadway. The smaller the crossing angle, the deformation of the acute side of the main roadway (lane 1) The larger the cross angle, the more the maximum settlement area of the main road in the cross section changes to the acute angle side. The smaller the crossing angle is, the more obvious the displacement is. It can be concluded from the result that the deformation of the roadway 2 is also affected by the crossing angle, starting from a distance farther from the intersection center 4, and the smaller the crossing angle is, the larger the deformation of the roadway 2 is. The research results can provide reference and reference for roadway design and support under similar conditions.