Model test on influence of initial stress on blast wave propagation in dry sand foundation

doi:10.3785/j.issn.1008-973X.2024.03.015

Journal of ZheJiang University (Engineering Science)

2024, Vol. 58

Issue (3): 579-588 DOI: 10.3785/j.issn.1008-973X.2024.03.015

Model test on influence of initial stress on blast wave propagation in dry sand foundation

Jiahao CHEN1,2(

),Junchao LI1,2,*(

),Bin ZHU1,2,Qiang LU3,Yubing WANG1,2,Longhua GUAN1,2,Fengkui ZHAO1,2

1. Center for Hypergravity Experimental and Interdisciplinary Research, Zhejiang University, Hangzhou 310058, China
2. MOE Key Laboratory of Soft Soils and Geoenvironmental Engineering, Zhejiang University, Hangzhou 310058, China
3. National Key Laboratory of Intense Pulsed Radiation Simulation and Effect, Northwest Institute of Nuclear Technology, Xi’an 710024, China

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Abstract

Several sets of blast model tests were conducted on dry sandy foundation with both normal gravity and supergravity, in order to investigate the effects of initial stress of sandy soil on the propagation characteristics of blast waves, such as peak pressure, rise time, propagation velocity, and dynamic unloading of initial stress. Experimental results showed that the initial self-weight stress inhibited the growth of the peak pressure of the blast wave in the near zone and had little effect on the far zone. The increase of initial stress made the rise time of the blast wave longer and more susceptible to attenuation from the shock wave into the elastic-plastic wave, and the propagation velocity of the blast wave was increased. The supergravity test could simulate the process of dynamic unloading caused by the blast load by restoring the original self-weight stress of the sandy soil, forming coupling wave of explosion pressure and soil initial stress dynamic unloading tensile stress. The dynamic unloading tensile stress lasted longer. The dynamic unloading tensile stress specific impulse magnitude gradually became the main part of the explosion energy with the increase of propagation distance, as compared to the specific impulse magnitude of the blast pressure. The damage effect caused by the dynamic unloading tensile stress specific impulse magnitude cannot be ignored.

Key words： underground explosion centrifugal model test dry sand blast wave velocity dynamic stress unloading

Received: 09 March 2023 Published: 05 March 2024

CLC:

TU 43

Fund: 国家自然科学基金资助项目（51988101）.

Corresponding Authors: Junchao LI E-mail: 22012178@zju.edu.cn;lijunchao@zju.edu.cn

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Cite this article:

Jiahao CHEN,Junchao LI,Bin ZHU,Qiang LU,Yubing WANG,Longhua GUAN,Fengkui ZHAO. Model test on influence of initial stress on blast wave propagation in dry sand foundation. Journal of ZheJiang University (Engineering Science), 2024, 58(3): 579-588.

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https://www.zjujournals.com/eng/10.3785/j.issn.1008-973X.2024.03.015 OR https://www.zjujournals.com/eng/Y2024/V58/I3/579

干砂地基初始应力对爆炸波传播影响的模型试验

为了研究砂土地基初始应力对爆炸波压力峰值、上升时间、传播速度和初始应力动态卸载等传播规律的影响，开展多组干砂地基常重力和超重力爆炸模型试验. 试验结果表明，初始自重应力会抑制爆炸波近区压力峰值的增长，而对远区的影响较小. 初始应力的增加使得爆炸波上升时间更长,更易由冲击波衰减为弹塑性波，并使得爆炸波波速增大. 超重力试验通过还原砂土地基的原型自重应力，能够模拟爆炸荷载诱发砂土地基初始应力动态卸载的过程，形成爆炸压力和土体初始应力动态卸载拉应力的耦合波，动态卸载拉应力持续时间更长. 与爆炸波压应力的比冲量相比，初始应力动态卸载拉应力的比冲量随着传播距离的增加逐渐成为爆炸能量的主要部分，其产生的破坏作用不可忽视.

关键词： 地下爆炸, 离心模型试验, 干砂, 爆炸波波速, 应力动态卸载

Fig.1 Equivalent circuit of blast process

Fig.2 Particle grading of ISO standard sand

Fig.3 Absorbing materials for model box

Tab.1 Test condition of explosion physical model

Fig.4 Location of soil pressure sensor

Fig.5 Throwing process of blast crater

Fig.6 Time history curve of blast soil pressure

Fig.7 Attenuation law of blast peak pressure with proportional distance

Fig.8 Arrival time of wavefront and peak pressure

Fig.9 Relationship between rise time of blast peak pressure and propagation distance

Fig.10 Variation of compressive stress with relative volume

Fig.11 Propagation velocity of peak pressure

Fig.12 Relationship between arrival time and propagation distance in normal gravity test GE-1 and GE-2

Fig.13 Relationship between arrival time and propagation distance in supergravity test CE-1 and CE-2

Fig.14 Relationship between blast wave velocity and peak pressure

Tab.2 Propagation velocity of explosion wave and attenuation critical characteristic value of blast wave

Fig.15 Stress time history curve below detonation

Fig.16 One-dimensional discrete wavelet transform

Fig.17 Blast induced initial stress dynamic unloading wave

Tab.3 Magnitude and proportion of specific impulse under coupling effect of dynamic unloading of initial stress and blast stress


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