Research on anti-explosion technology of underground protective layer based on the full reflection effect of stress wave

Abstract

Abstract A circular gradient blast-resistant structure has been designed by employing the concept of altering the propagation direction of stress waves. The phenomenon of total reflection of stress waves is examined through theoretical derivation and numerical simulation. Building on this total reflection effect, a ring gradient design for the protective structure was developed. To investigate its dynamic response, simulations were conducted using a Hopkinson compression bar test on the ring gradient protective layer. The changes in stress before and after impact were compared with those observed in the ring protective layer, inclined protective layer, and scenarios without any protective layer. The results indicate that when an incident wave travels from a soft medium to a hard medium, greater incident angles lead to increased attenuation of the peak value of the stress wave. When the incident angle reaches the critical value for total reflection, transmitted stress experiences an attenuation degree of up to 70%. Beyond this critical angle, there is no significant change in transmitted stress. Furthermore, the annularly oriented gradient protective layer achieves a peak value attenuation rate of 43.3%, effectively delaying the rise time of the stress wave.

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