Compressed-gas-driven shock tubes have become popular as a laboratory-scale replacement for field blast tests. The well-known initial structure of the Riemann problem eventually evolves into a shock structure thought to resemble a Friedlander wave, although this remains to be demonstrated theoretically. In this paper, we develop a semi-analytical model to predict the key characteristics of pseu...

This study used experimental and numerical simulation methods to discuss the attenuation mechanism of a blast inside tunnel for different forms pressure reduction module under condition near-field explosion. In terms experiment, small-scale model was explosion experiments (expansion chamber, one-pressure relief orifice plate, double-pressure plate). simulation, transfer effect evaluated using A...

Abstract Stemming is one of the main concerns in blast rock engineering due to its impact on explosion energy consumption and excavation performance. In this study, blast-induced fragmentation under different stemming conditions numerically studied using combined numerical modelling image processing. After careful determination parameters constitutive material models, developed model LS-DYNA ve...

To monitor the underwater sound and pressure waves generated by anthropogenic activities such as underwater blasting and pile driving, an autonomous system was designed to record underwater acoustic signals. The underwater sound recording device (USR) allows for connections of two hydrophones or other dynamic pressure sensors, filters high frequency noise out of the collected signals, has a gai...

A combined finite-discrete element method (FDEM) is proposed to model the dynamic fracture, fragmentation, and resultant muck-piling process during mining production by blast in underground mine. The key component of method, that is, transition from continuum discontinuum through fracture introduced detail, which makes superior continuum-based finite discontinuum-based discrete method. FDEM cal...

To effectively mitigating intense impact and blast waves, a novel protection mechanism is proposed in this study where a significant amount of the incident energy can be temporarily captured as potential energy in a nonwetting liquid-nanoporous material system, thereby weakening the peak pressure and elongating the impact pulse. When the pressure of a compressive wave traveling in a liquid over...

air cooled blast furnace slag is a by product made of gradually air cooled molten blast furnace slag, and is often stored in stockpiles near the iron mills and usually occupy a wide area around the iron mills. from this perspective the further use of these materials can have its own merits. air cooled blast furnace slag can be used in asphalt mixtures because of their proper frictional properti...