论文部分内容阅读
针对底板破坏型冲击矿压的巷道支护问题,采用理论分析和数值模拟的方法研究了锚网与“O”型棚联合支护形成的封闭柔性支护结构对底板型冲击的抑制作用。研究表明:相同采掘地质条件下,采用封闭柔性支护结构的巷道和采用其他支护形式的巷道一样,底板存在高水平应力集中现象,具有冲击危险性,在动载扰动作用下,底板垂直位移瞬间增大,水平应力降低,发生了底板冲击显现;而与其他支护形式的巷道不同的是冲击后没有发生严重的底板破坏,而是以巷道围岩的径向变形为主,位移量也相对较小。说明封闭柔性支护结构虽然不能完全消除冲击危险,但可以降低冲击的显现规模和程度。研究成果对类似矿井的冲击危险巷道支护具有借鉴意义。
Aiming at the problem of roadway supporting with floor rock burst pressure, the effect of closed flexible support structure formed by combined support of anchor net and “O” shed on the impact of floor impact was studied by theoretical analysis and numerical simulation . The research shows that under the same mining geological conditions, the roadway with closed flexible support structure has the same level of stress concentration as the roadway with other supporting forms, which has the impact risk. Under the action of dynamic disturbance, the vertical displacement of the floor Instantaneous increase, the horizontal stress decreases, the impact of the occurrence of the floor impact; and other forms of roadway support is not after the impact of a severe floor damage, but rather to the surrounding rock roadway radial deformation, the displacement is also Relatively small. It shows that the closed flexible support structure can not completely eliminate the impact risk, but can reduce the scale and extent of impact. The research results have reference significance for mine roadway support with impact hazard.