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为解决T型巷道交岔点跨度大、围岩控制困难的问题,采用理论分析、数值模拟和现场实测相结合方法,研究T型巷道交岔点围岩破坏特征、控制机理和控制效果。研究发现:巷道交叉三角区域是最易失稳区,破坏形式有顶板冒落和弯曲下沉,影响因素有巷道断面、岩体强度、交叉角度和埋深等;基于加强两巷相交初期三角区域支护原则,提出T型巷道交岔点主巷、支巷和三角区锚网索加强支护技术和参数;数值模拟和现场实测表明锚网索加强支护后,围岩应力值和应力集中程度都明显缓和,巷道位移在可控范围之内,受力环境明显改善,支护形式和参数选择较合理。
In order to solve the problem of large span of T-shaped roadway crossing and difficult control of surrounding rock, the failure characteristics, control mechanism and control effect of surrounding rock of T-shaped roadway crossing are studied by the combination of theoretical analysis, numerical simulation and field measurement. It is found that the crossing triangle area of the roadway is the most prone to be destabilized zone, and the failure forms include roof caving and bending subsidence. The influencing factors are roadway section, rock mass strength, crossing angle and burial depth. Based on the initial triangular region Supporting principle and the technology and parameters for strengthening support of anchor net, branch lane and triangular anchor net in T-type roadway crossing are put forward. Numerical simulation and field measurement show that the stress value and stress concentration The degree is obviously eased, the displacement of the roadway is within the controllable range, the stress environment is obviously improved, the support form and parameter selection are more reasonable.