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Updated: May 16, 2025

Evaluating Primary Blast Effects In Vitro
Published on: September 18, 2017
Study on the influencing mechanisms of obstacles on dust lifted by shock waves after tunnel blasting
Jing Hu1, Angui Li2, Haihang Cui2
1School of Building Service Science and Engineering, Xi'an University of Architecture and Technology, Xi'an 710055, China; National Experimental Teaching Demonstration Center for Environment Specialty, School of Environment and Municipal Engineering, Xi'an University of Architecture and Technology, Xi'an 710055, China; International Joint Laboratory on Low Carbon Built Environment, Ministry of Education of China (Xi'an University of Architecture and Technology), Xi'an 710055, China.
Abstract:
Understanding the influence mechanisms by which obstacles affect the dust lifting process resulting from shock waves after tunnel blasting requires clarifying the influence of obstacles on the spatiotemporal evolution characteristics of shock waves and the interaction mechanisms between obstacles and dust layers at different spatial positions. Using compressible flow numerical simulations, a gas-solid two-phase flow model was established to simulate shock wave evolution influenced by obstacles and their interactions with the dust layer at different tunnel locations. Compared with conditions without obstacles, when the dust layer is situated upstream of the obstacle, the shock wave reflection and the obstruction by the obstacle create an upstream enhanced dust lift (UEDL) mechanism. When the dust layer is located in the slanted reflection zone behind the obstacle, complex vortex motions and low-pressure areas lead to a proximal backflow dust suppression (PBDS) mechanism. When the dust layer is located in the Mach reflection zone downstream of the obstacle, multiple reflections result in a distal attenuation dust suppression (DADS) mechanism. This study identifies three mechanisms by which obstacles influence shock wave-induced dust lifting at varying spatiotemporal locations, providing a theoretical basis for dust suppression research post-tunnel blasting with significant practical applications.
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