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为了研究爆炸条件下不同垫板形式锚杆对洞室加固效果的影响,现场试验中选择了平板和碗形两种不同的垫板形式。通过抗爆试验,对锚固洞室宏观破坏形态、洞壁位移特征、拱顶位移与比例距离之间的关系以及爆心两侧拱顶各点位移进行了对比,分析了两种垫板形式在爆炸条件下对洞室加固效果的影响。试验结果表明:在爆炸条件下,碗形垫板可以充分发挥锚杆抗拉能力高的特点,拱部围岩经碗形垫板加固后,整体刚度能够得到较大提高,对岩体的加固效果较好。
In order to study the effect of different form of anchor plates on the reinforcement effect of the cavern under blasting conditions, two different plate forms of plate and bowl were selected in the field test. Through the antiknock test, the macroscopical failure mode, the displacement characteristics of the cave wall, the relationship between the dome displacement and the proportional distance and the displacements of the vaults on both sides of the explosive core are compared. Influence of Conditions on Strengthening of Caverns under Conditions. The experimental results show that under explosive conditions, the bowl-shaped pad can fully exert the high tensile strength of the anchor. After the surrounding rock of the arch is reinforced by the bowl-shaped pad, the overall rigidity can be greatly improved, and the reinforcement of the rock mass The effect is better.