梯形巷道支护结构耦合控制与稳定性分析

Analysis of Coupling Control and Stability of Support Structure in Ladder-shaped Roadway

以宁东矿区强烈地质构造复合顶板为工程背景,研究梯形复合顶板巷道的围岩稳定性控制。倾斜煤层沿顶掘进巷道断面呈梯形,顶板暴露宽度增大,在复合顶板条件下支护难度大大增加。建立以老顶为大梁,锚杆加固的复合顶板组合梁为小梁的"双梁"支护结构模型,提出了"双梁"耦合支护原理、倾斜顶板巷道锚杆索角度不对称支护理论,并在130202工作面机巷得到工程验证。

We studied stability control of surrounding rock in trapezoid composite roof roadway with the engineering background of strong geological structure in Ningdong Mining Area. The section configuration of the roadway driving along the top in the inclined coal seam is trapezoidal and the exposure width of the roof increases. This condition leads to difficulty of the roadway supporting greatly increasing. The double beam supporting structure model is founded,which takes main roof as the girder and roof composite beam as the joist,and the coupling support theory of double girder and the theory of angle asymmetric in the bolt support in the inclined roof roadway is proposed. In the end,all of these theories passed the engineering verification in the 130202 tunnel.