Research on Blasting Fragmentation and Charge Weight in Simulating Deep Water

摘要

Using simulating deep water blasting pressure vessel, the explosion energy was researched under 0. 6m water depth and from 5. 6m to ISO. 6m simulating water depth using by 8# detonator. The results show that specific shockwave energy keeps invariant although the water depth changes, but the specific bubble energy will decrease with water depth increasing, which lead to the decrease of total explosion energy. The influence of fragmentation on explosion energy was researched by using 0. 22m high cement mortar test block at the same water depth and charge, which blasting radius is 0. lm. The blasting fragmentation was screened which minimum side length is divided into three zone. The results show that the small and middle block decreases gradually with simulating water depth from 5. 6m to 90. 6m, but the big block increases obviously, when the water depth exceeds 110. 6m, the test block only appears crack and can not disintegrate. Based on this, using by the same test block, the experiment was carried by increasing detonator charge weight in the water depth of 30.6m, 50. 6m, 70. 6m and 90.6m where the big block is relatively concentrate. The experimental results show that the distribution of small block is irregular obviously, but middle block increase, big block decrease gradually. When the big blasting block is controlled at the 0%, 10%, 20%, 30%, 40%, respectively, the relationship curves between charge weigh and water depth and regression calculation formula were obtained by data calculation, which is from the big block control rate. The research results have reference value for the blasting design under different depth of water and unit consumption calculation.