万吨巨轮水下切割爆破

为了疏通航道需将万吨沉船进行爆破切割后打捞。根据施工环境和船体结构,采用矩形截面TNT药块作用于结构面实施爆破切割。文中介绍了确定切割方案、选择布药点、合理设计药量、TNT药块的组合加工及起爆网路的敷设,最后爆破拆除沉船取得圆满成功。此经验可供类似工程参考借鉴。

Discussion on application of delay time in hole-by-hole initiation network of digital electronic detonators

In order to obtain the best delay time of digital electronic detonator in hole by hole initiation network and improve the blasting effect, five blasting tests were carried out by adjusting the delay time between holes and rows in the limestone mining project of Yushugou marble mine, Wuchuan township, Baiyin district, Baiyin city, Gansu province. The control variable method under the condition that parameters such as parameters of blasting hole network and unit consumption remained unchanged was adopted, the inter-hole delay time was adjusted from 25 ms to 20 ms, and the delay time per meter of hole spacing was 3-4 ms, the delay time of row interval was adjusted from 75-110 ms to 45 ms, and the delay time of row interval was 9 ms per meter, which achieved good blasting effect, the mining efficiency and the evenness of stope were improved, and provided reference data and experience support for similar engineering construction. But the blasting theory research shows that the row between delay time affected by the row numbers, time delay between holes and rows can't unlimited narrow, narrow delay time increases and there is a critical value, more than the critical value will cause blasting accidents, the critical value and the change rule of rock properties, structure and performance of explosive is related to a variety of conditions, such as the subject to further research according to the actual circumstance of mine blasting colleagues in the industry.