大断面T型巷道交岔点围岩失稳控制数值模拟研究
Numerical Simulation Research on Large Cross Section T-type Roadway Surrounding Rock Intersection Instability Control
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摘要: 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。Abstract: To solve the problems of large span, difficult control of surrounding rock in T-type roadway intersection, combining methods including theoretical analysis, computer simulation and field measurement are adopted to study the failure characteristics, control mechanism and control effect of T-type roadway intersection surrounding rock. Research found that: triangular area formed by the intersection of roadways is the most vulnerable area of instability, and damage forms are roof caving and curved sinking and affecting factors are roadway cross-section, rock strength, the crossing angle and depth, etc; based on the principle of strengthening triangle regional support in early two lane intersection, we proposed technology and parameters for T-type roadway intersection main lane, branched lane and triangle mesh and anchor support; numerical simulation and field test shows that after anchor net reinforced support, stress and stress concentration significantly ease roadway displacement in the controllable range, the force environment improved significantly, supporting forms and parameters are more reasonable.
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