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竖井下掘采用光面爆破时,常用导爆索同时起爆周边眼。过去我们在施工中,经常出现部分导爆索拒爆现象,为了解决这一问题,对导爆索性能作了一些试验。其中有两种形式很说明问题:第一种,在导爆索的两端各放一个药包(1,2),中间用一个雷管起爆,此时药包2准爆,而药包1拒爆(图1)。第二种,在导爆索上布置如图2所示几个药包,中问用带有雷管的药包起爆,此时,1,2,3,4四个药包准爆,药包5拒爆。
Vertical shaft digging with smooth blasting, detonating cord commonly used at the same time detonate the surrounding eyes. In the past, during construction, some detonating cables often refused to explode. In order to solve this problem, some tests were conducted on the performance of detonating cables. There are two forms which illustrate the problem: The first one, put a kits at both ends of the detonating cord (1, 2), the middle with a detonator detonated, when the kits 2 quasi-burst, and the kits 1 refuse Burst (Figure 1). The second, the detonating cord on the layout shown in Figure 2, several kits, asked with a detonator kits detonated, this time, 1,2,3,4 four kits quasi-explosion, kits 5 refused to burst.