Abstract
The blasting stress wave and blasting gas generated by explosive blasting are the two main motive powers of rock fragmentation. An experimental method based on water jet test is used to study the energy distribution ratio of blasting stress wave and blasting gas; the utilization efficiency of blasting energy under different borehole constraint conditions is also analyzed. It proves that the blasting stress wave does not cause the water jet, and the blasting gas is the only power of the water column jet. The results show that the energy of the blasting gas and blasting stress wave respectively account for about 64% and 36% of the total energy generated by the explosion of lead azide. The utilization efficiency of the blasting gas energy under strong, medium, and weak constraint conditions is 100%, 80%, and 52%, respectively. The borehole constraint condition is crucial for the effective utilization of blasting energy.
Highlights
Explosive blasting is an extremely rapid chemical energy release process that has a strong impact on the surrounding medium and produces a large amount of blasting gas [1]
Rock blasting fracture is the result of the combined action of the blasting stress wave and the blasting gas
The action effect of the blasting stress wave and blasting gas is an important part of the basic theory of rock blasting
Summary
Explosive blasting is an extremely rapid chemical energy release process that has a strong impact on the surrounding medium and produces a large amount of blasting gas [1]. The theory of the combined action of blasting stress wave and blasting gas [5] is more practical and accepted by most researchers because it comprehensively considers the role of blasting stress wave and blasting gas in the rock failure process. Based on this theoretical consensus, it is hoped that the energy distribution characteristics of the blasting stress wave and blasting gas and the effects on rock fragmentation can be quantitatively analyzed in order to enrich rock blasting theory. Different materials are used to block the borehole in order to study the utilization efficiency of blasting energy under different borehole constraint conditions
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