在爆炸荷载作用下长锚杆喷锚支护坑道的动态反应

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。

The Dynamic Response of Gallery Supported by Long Bolts under Blasting Loads Huang Chengxian

The response of long bolts in weathered and fractured granite under blasting was experimentally studied. The opening supported with long bolt and shotcret was chosen for the design, which was examined by monitoring stress states and particle vibrations round the opening during blasting. Borehole TV, sonic wave method and macro investigation were also used to determine fracture features post blasting. Neither falling rock nor bulging on bottom were found. The long bolt strengthened opening has proved to have good support effects and excellent response against blasting, compared with neighbouring unlined or short bolting opening.