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随着煤矿开采深度的增加,巷道矿压显现加剧,巷道以主被动的组合支护为主,其中U型钢可缩支架被广泛采用,但是开放式的拱形结构不适应深井全断面来压的应力环境,U型棚腿部折断和倒棚现象时有发生.采用数值模拟软件FLAC5.0对锚杆护帮约束前后U型棚支架的载荷变化规律及对巷道围岩的稳定性影响进行深入研究和剖析,得出U型棚采用锚杆锁腿后,支护体与围岩的稳定性明显提高;锁腿护帮锚杆预紧力对深部架棚巷道的稳定性起着决定性的作用;提出护帮约束棚腿锚杆合理的预紧力.
With the increase of coal mining depth, the roadway pressure appears more and more, and the roadway is dominated by active and passive support, among which U-shaped steel retractable brackets are widely used, but the open arch structure is not suitable for deep section full pressure Stress environment and U-shaped cantilever leg breakage and upside-down phenomenon occurred from time to time.Using numerical simulation software FLAC5.0, the variation of load of U-shaped shed support before and after the restraining of bolt guard and the influence on the stability of the surrounding rock of the roadway were deeply studied Research and analysis, it is concluded that the stability of the support body and the surrounding rock is obviously improved when the U-shaped shed is adopted and the pre-tightening force of the retaining and protecting bolt plays a decisive role in the stability of the deep gable roof tunnel Proposed to protect the shackle legs bolt rational reasonable pre-tightening force.