YANG Yang 1, 2, LU Wenbo1, 2, WANG Yang1, 2, HUANG Yufeng1, 2, WANG Gaohui1, 2, CHEN Ming1, 2, YAN Peng1, 2
Journal of Vibration and Shock. 2025, 44(12): 269-278.
The peak overpressure of underwater explosion induced shock waves in water is mainly based on the Kuhl formula, without considering the mechanism of underwater drilling and blasting induced shock waves in water. In response to the lack of reliable prediction methods for overpressure caused by underwater drilling and blasting induced water shock waves, this paper first theoretically analyzes the rock breaking and water shock wave excitation process of the blasting system composed of water explosives rock mass. Furthermore, by comparing the theoretical and numerical solutions of the peak pressure of the water hammer wave under the action of explosive stress waves, it was found that when the explosive stress wave first entered the elastic deformation zone, the numerical solution was relatively small, indicating that the rock mass's elastic-plastic deformation zone gradually transitioned from the plastic deformation zone to the elastic deformation zone, and as the distance increased, it entered the elastic deformation zone of the rock mass. The fitting effect between the numerical solution and the theoretical solution was good. Furthermore, based on the SPH-FEM coupling method, the motion process of detonation product particles around the blast hole was simulated, and combined with the single hole underwater blasting test data from the Yangtze River channel construction project site, the waveform characteristics of water hammer waves were compared and verified. The research results indicate that there are three mechanisms for underwater drilling and blasting to excite shock waves in water. After the explosive detonates in the borehole, the stress wave of the explosion will undergo a complex process of transmission and reflection when it encounters the interface between rock and water. Some will reflect back from the interface, while others will transmit and excite shock waves in the water at the interface; As the detonation wave propagates, the explosive gas is subsequently ejected from the borehole opening, triggering a shock wave in the water; Affected by the explosion shock wave, the blast hole cavity begins to undergo radial dynamic expansion, followed by further crack propagation, completing the bulging and fragmentation of the rock mass, causing the explosion generated gas to expand and escape into the water from the cracks in the rock mass bulge, and exciting underwater shock waves.
