Research on Penetration of Aluminum Liner into Concrete Target Plates

This study employed field tests, numerical simulations, and engineering application methods to investigate the influence of the law of aluminum pharmaceutical-shaped jets with varying cone angles and wall thicknesses during penetration of a concrete target plate at a blasting height of 6D. The structural parameters responsible for producing favorable penetration effects were identified and subsequently implemented to improve the detonation efficiency of the shaped energy spacer charge in practical engineering applications. The results demonstrate that in the field test, the size of the funnel pit initially increases and subsequently decreases as the cone angle varies from 60° to 120°, with the maximum diameter (48.88 mm) and depth (23.54 m) of the funnel pit occurring at a cone angle of 110° and a wall thickness of 2 mm. The numerical simulation and test results align with the variation patterns of funnel pit diameter and depth, exhibiting minimal error, thereby validating the effectiveness and accuracy of the penetration test. The optimized structural parameters of the cover were implemented in the 1# transverse hole of a tunnel, and ten field test cycles confirmed successful detonation without explosion rejection, ensuring operational continuity and blasting safety. These findings offer a reference for tunnel blasting and related engineering applications.