Test and Numerical Research of Explosion Inside Partially Confined Tunnel Structure

doi:10.12382/bgxb.2023.0480

Abstract

Abstract:

The propagation and attenuation effect of blast wave in a proposed partially confined tunnel structure are investigated. A three-dimensional finite element model of the partially confined tunnel structure is developed to simulate the propagation of blast wave in the partially confined tunnel and quantify the blast loading vented from the internal space to the adjacent free field. The mechanism of vortex forming, venting effect and blast wave attenuation characteristics are revealed based on the numerical predictions. The significant improvement effect of a composite configuration consisting of T-joints, venting channel, and expansion chambers on the wave attenuation efficiency is revealed by using numerical predictions and theoretical predictions based on scaling laws, the venting effect of the proposed tunnel structure is quantified. and the blast overpressure distribution in the adjacent free-field is obtained. This work can provide technical support for the structural optimization design of the partially confined tunnel.

Key words: partially confined tunnel structure, blast wave release and attenuation, blast wave propagation, pressure distribution

CLC Number:

O383.1

CHEN Tainian, REN Huiqi, LI Suling, ZHANG Shanshan, ZHANG Chengjian, YUAN Ye. Test and Numerical Research of Explosion Inside Partially Confined Tunnel Structure[J]. Acta Armamentarii, 2024, 45(7): 2404-2413.

Figures/Tables 24

Fig.1 Layout of venting tunnel

Fig.2 Calculation principle of model interface

Fig.3 Testing cases of 1∶6 scale model

Fig.4 Internal and external overpressure gauges of the model

Fig.5 Overpressure gauges outside the portal

Fig.6 Lifting the charge in place

Fig.7 Closjng the cap after charging

Fig.8 Macroscopic observed results of the testing Cases 1 and 2

Fig.9 Typical overpressure history data

Fig.10 Peak pressure in tunnel

Fig.11 Peak pressure outside portal

Fig.12 Schematic diagram of 3D simulation model

Fig.13 Schematic diagram of simulation mode

Fig.14 Shock wave releasing through main tunnel

Fig.15 Pressure distribution in T-shaped tunnel

Fig.16 Overpressure-time history inside T-shaped tunnel

Fig.17 Wave attenuation and flow pattern of shock wave inside expansion chamber

Fig.18 Flow pattern of shock wave outside the portal

Fig.19 Overpressure-time history outside the portal

Fig.20 Overpressures inside pipeline in different cases

Table 1 Comparison of test, simulated and calculated results

结果	p₁/kPa	p₉/kPa	p₁₂/kPa	泄压效率/% (1-p₉/p₁)	消波效率/% (1-p₁₂/p₉)
工况1试验结果	1881	594	539	68.5	9
工况2试验结果	1604	746.6	223.8	53.5	30
工况1模拟结果	1781	628.1	245.7	64.7	60.8
工况2模拟结果	1781	598.4	176.3	66.4	70.5
工况1公式计算结果	2942	1471	301	50	79.5
工况2公式计算结果	2942	1471	60	50	95.9

Fig.21 Peak overpressure contour of test data

Fig.22 Peak overpressure contour of simulated data

Fig.23 Simulated and test typical overpressure-time curves

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