Experiments and simulation of block motion in underwater bench blasting

Area of Science:

• Engineering
• Geotechnical Engineering
• Explosives Engineering

Background:

• The mechanism of underwater rock blasting, a key aspect of engineering blasting technology, lacks systematic study.
• Traditional methods like laboratory experiments and field tests have limitations in observing underwater blasting effects.

Purpose of the Study:

• To systematically investigate the blasting mechanism of underwater rocks.
• To analyze the motion and accumulation effects of blasted blocks in underwater scenarios.

Main Methods:

• A model experiment of underwater concrete bench blasting was conducted.
• High-speed cameras were used to observe the motion of blasted blocks.
• Numerical simulation was performed using Fluent coupled with an engineering discrete element method.

Main Results:

• Underwater blasting causes blocks to bulge due to blast waves and bubble pulsation.
• Block movement includes bulging, shrinking, and significant vertical displacement.
• Increased charge leads to greater disturbance and enhanced horizontal displacement of blocks.

Conclusions:

• The study provides insights into the complex dynamics of underwater rock blasting.
• Numerical simulations coupled with experimental data offer a viable approach for studying these phenomena.
• Findings are crucial for optimizing underwater engineering blasting operations.