Method for Determining the Unit Consumption of Explosives in Underwater Drilling and Blasting

Abstract

The invention discloses a method for determining the unit consumption of an underwater drilling blasting explosive. The method comprise the steps that a model test block is prepared, a hole is drilledin the model test block for containing the explosive, a recycling net is placed below to collect blasted fragments, and the model test block is placed in a water medium blasting container; the watermedium blasting container is used for manufacturing different water depth conditions, each water depth corresponds to multiple groups of different explosive unit consumptions, and the blasting experiment is performed separately; the recycling net recycles the blasted fragments, the blasted fragment degree is divided into a small fragment interval, a medium fragment interval and a large fragment interval, and respective occupancy rates are calculated to determine the optimal unit consumption; and the experimental data is analyzed to build the functional relation among the water depth, the blasted fragment degree and the optimal unit consumption, and the correction factor in the formula is determined based on the Swedish explosive unit consumption calculation formula q=x*q1+q2+q3+q4. The method for calculating the unit consumption of the underwater drilling blasting explosive is normalized, the optimal unit consumption is found, and harm caused by underwater drilling blasting is reducedwhile ensuring the blasting effect.

Description

technical field [0001] The invention relates to the technical field of engineering geology, in particular to a method for determining unit consumption of underwater drilling and blasting explosives. Background technique [0002] With the development of construction projects such as domestic ports and waterways, there are more and more underwater drilling and blasting projects. Underwater drilling and blasting is an important part of engineering blasting, and is widely used in engineering fields such as wharf and dock construction, channel dredging, underwater stonework excavation, silting and embankment, underwater blasting and demolition, etc. . [0003] The main feature of underwater drilling and blasting is that the interface between the blasting medium and water bears the pressure of the water, and the displacement of the broken rocks must also overcome the resistance of the water. Therefore, the calculation of the charge should include breaking the rock and overcoming ...

AI Technical Summary

Problems solved by technology

Compared with land drilling and blasting, the unit consumption of underwater drilling and blasting explosives is affected by many conditions such as free water surface, water flow, underwater terrain, construction methods, etc., the calculation is more complicated, and there is no recognized unified formula at present

In the prior art, there are corrections to the unit consumption of step blasting, and a method for determining the unit consumption of pretreatment explosives for boulder blasting under overlying rock-soil conditions, but there is no research on determining the unit consumption of explosives for underwater drilling and blasting

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