A Method for Computing Explosion Shock Wave Propagation in Network Tunnels

Abstract

The invention relates to a method for calculating the explosion shock wave propagation in a networked tunnel, which includes: establishing a tunnel network diagram and initial node initialization, establishing the most unfavorable propagation path according to three preset indicators, calculating the attenuation coefficient of the most unfavorable path, For calculating node shock wave overpressure and calculating engineering discrete point shock wave overpressure, the present invention provides a method for calculating the most unfavorable propagation path based on the three indicators of minimum cumulative distance, minimum cumulative node degree, and minimum cumulative excluded air volume. When calculating the attenuation coefficient, consider The impact of explosion shock wave attenuation under the typical working conditions of the initial section of the explosion, entrance at the mouth, straight line propagation, inflection point, bifurcation, and section improves the accuracy and reliability of the final calculation, while ensuring a low algorithm complexity.

Description

technical field [0001] The field of the invention is the field of protection engineering, specifically a method for calculating the propagation of explosion shock waves in a networked tunnel. Background technique [0002] Tunnel structure is a relatively common structural form in underground engineering facilities such as subways, mines, comprehensive pipe corridors, underground tunnels, civil air defense projects, and military protection projects. One of the core issues of safety management, civil air defense construction, military protection, etc. Compared with the unconstrained explosion shock wave, the explosion shock wave in the tunnel is continuously propagated along the tunnel due to the obstruction and restraint of the surrounding walls of the tunnel. The overpressure peak value of the explosion shock wave, The attenuation law of effect parameters such as action time is more complicated than that in free field. Research shows that different tunnel configurations have...

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Problems solved by technology

[0004] 1. The small-scale model tunnel test or prototype tunnel test method has a long construction period, high investment cost, and weak versatility. It is generally only used for some tunnel sections or key technology verification, and it is impossible to carry out tests on complete network tunnels; numerical simulation The modeling workload of the calculation method is heavy and the simulation time is long, which is not convenient for fast calculation;

[0005] 2. The traditional peak calculation method of blast shock wave incident overpressure generally only considers that the explosion point is outside the mouth of the tunnel, and rarely involves the explosion inside the tunnel. There is also a lack of systematic research on the explosion at different positions inside the tunnel in the prior art;

[0006] 3. When some existing algorithms calculate the incident overpressure peak value of the blast shock wave at a certain point in the tunnel, the most unfavorable path for the propagation of the blast shock wave is equivalent to the shortest distance path from the explosion point to the point in the tunnel. In fact, it is only The distance attenuation factor of the explosion shock wave propagating along the straight line is considered, and the attenuation effect of the explosion shock wave at the tunnel inflection point, bifurcation, interface mutation and other configurations is ignored. The attenuation effect of these positions is generally more influential than the distance attenuation factor, so it is concluded that There will be a large deviation between the results and the theoretical value

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