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应用模型试验与数值计算相结合的方法,对爆炸荷载作用下锚杆根部加强加固洞室围岩的变形特征及锚杆受力性能进行了研究。结果表明,在顶爆条件下,拱顶部位岩体产生的变形要大于其它部位岩体,是加固的重点地方;在锚杆端部附近,锚杆受力以受拉为主,在根部附近,以受压为主。在拱顶爆炸荷载作用下,围岩变形特性决定了拱部锚杆的受力要大于侧墙部位锚杆的受力,这两个部位的锚杆压应变峰值和拉应变峰值均不是产生在锚杆两端的截面上,而是产生在杆体中间部位。
By means of the combination of model test and numerical calculation, the deformation characteristics of the surrounding rock of reinforced cavern under the action of blast load and the mechanical properties of the bolt are studied. The results show that under the top blasting conditions, the deformation of the rock mass in the vault area is greater than that of the rock mass in other areas, which is the key point of reinforcement; in the vicinity of the end of the rock bolt, the stress of the rock bolt is mainly tensioned and near the root To pressure-based. Under the explosion load of the dome, the deformation characteristics of the surrounding rock determine that the stress of the arch bolt is greater than the stress of the bolt on the sidewall. Both the peak of the compressive strain and the peak of the tensile strain are not generated Instead, the rod ends in the middle of the rod.