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本文介绍在断裂构造发育的风化花岗岩中采用长锚杆喷锚支护坑道的抗爆试验研究。在爆炸瞬时测定了锚杆和喷层的受力状态及洞周边的质点运动规律,以检验设计的可行性;爆后用声波法、钻孔电视和宏观调查确定其破坏状态,未发现有掉石和底鼓等现象。对比相邻的毛洞段和短锚杆试验段的破坏状态,表明长锚杆支护效果显著,抗爆性能优良,设计合理。
This paper describes the anti-knock experimental study of long-anchor shotcrete support tunnels in weathered granite developed in faulted structures. At the moment of explosion, the force state of the anchor bar and the spray layer and the movement of the particles around the hole were measured to check the feasibility of the design. After the explosion, the state of damage was determined by acoustic wave method, borehole television, and macroscopic investigation. No damage was found. Stone and kick drums and other phenomena. Comparing the damage status of the adjacent section of the hair shaft and the short bolt test section shows that the long bolt support effect is significant, the antiknock performance is excellent, and the design is reasonable.