Laboratory scale investigation of stress wave propagation and vibrational characteristics in sand when subjected to air-blast loading

Vivek, Padmanabha; Sitharam, T. G.

doi:10.1016/j.ijimpeng.2018.01.003

Cited by 17 publications

(6 citation statements)

References 33 publications

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“…e effect of blasting vibration is a phenomenon that the energy propagates in the form of an elastic wave in the rock mass or other medium, which causes blasting vibration within a range of spatial areas, as shown in Figure 1 [18,26,27]. Meanwhile, the particle of medium to reciprocate in a straight line or a curve along its equilibrium position is caused by the blasting stress wave, and it changes periodically over time, where the phenomenon of mass points can be called "mechanical vibration."…”

Section: Effect Of Blasting Vibrationmentioning

confidence: 99%

Mechanism and Application of Blasting Technology Using Phase-Difference Vibration Mitigation on Adjacent Railway Tunnel

Zhang

Zhou

Zhang

et al. 2022

Shock and Vibration

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The blasting vibration velocity is a widely used controlling index for the safety assessment of tunnel structures. How to reduce the impact of blasting vibration on the operation of adjacent railway tunnels is worth studying. In this paper, the initial phase-difference of blasting using phase-difference shock absorption is derived from the propagation theory of the blasting stress wave. When the initial phase-difference is Δφi = ±(2n + 1)π (n = 1, 2, 3, …), the peak particle velocity (PPV) in the tunnel structure is decreased to the minimum. On the basis of blasting theory using phase-difference shock absorption, the blasting parameters were designed for the No. 2 drainage tunnel excavated which adjacent a railway tunnel from Guiyang to Changsha, and it carried out 4 times blasting tests. It was found that the PPV of the railway tunnel structure in X, Y, and Z directions reduced by 64.6%, 66.25%, and 81.26%, respectively, which compared with the conventional blasting with the same total quality. Meanwhile, the amount of overbreak and underbreak can be controlled within 5%. The results show that the effect of blasting technology using phase-difference vibration mitigation is obvious, which is able to match with the design requirements for the tunnel excavation contour. The blasting technology using phase-difference vibration mitigation can be achieved via controlling the blasting time interval accurately. Moreover, it is beneficial for enriching and developing the blasting vibration control technology.

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Section: Effect Of Blasting Vibrationmentioning

confidence: 99%

Mechanism and Application of Blasting Technology Using Phase-Difference Vibration Mitigation on Adjacent Railway Tunnel

Zhang

Zhou

Zhang

et al. 2022

Shock and Vibration

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“…where μ is the static Poisson ratio of rock. e researches about the physical process of rock blasting show that the attenuation of the explosive stress wave is not only related to the physical mechanical properties of the rock but also depends on the explosive detonation parameters [26][27][28]. Effects of explosive detonation parameters on stress not only reflect on the pressure on blasting hole wall but also on the stress wave attenuation coefficient.…”

Section: E Stress Concentration Effect Of Adjacent Empty Holementioning

confidence: 99%

Effect of Adjacent Hole on the Blast‐Induced Stress Concentration in Rock Blasting

Yang

Shao

Jing

et al. 2018

Advances in Civil Engineering

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To investigate the effect of an adjacent hole on the blast-induced stress concentration in rock blasting, a rock blasting model with an adjacent hole is explored through theoretical analysis and numerical simulation. The commercial software LS-DYNA is utilized to simulate adjacent hole effect in rock blasting, in which the Johnson–Holmquist concrete material model is used to simulate rock and the high-explosive-burn-explosive and the equation of state of JWL are used to simulate explosive. Influences of the key parameters of adjacent hole effect in rock blasting, pitch of holes, adjacent hole diameter, and uncoupled medium in a blasting hole are extensively explored. According to the simulation results, when the explosion stress wave spreads to the adjacent hole wall, the tangential stress on the adjacent hole wall induced by the explosion stress wave is always greater than the radial stress. Adjacent hole diameter has a major effect on stress concentration, but with the adjacent hole diameter increasing, the stress concentration phenomenon weakens and the free surface effect of the adjacent hole plays a more important role.

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“…The process of compaction increases the contact between particles, allowing the dissipation of energy from the propagating shockwave [7][8][9]. More recently, sand has found application as a common infill in protective systems such as HESCO.…”

Section: Introductionmentioning

confidence: 99%

“…While experimental impact studies allow for a clear observation of the response of sand to dynamic loading, they pose a challenge with regards to the quantification of this response [6]. The use of sensors and high speed cameras along with processes such as digital image correlation have been used in recent years to measure the response of sand to impact and study its energy absorption characteristics [8]. The caveat with this experimental method is the cost of equipment and the increased source of human error given the increased complexity of the setup [6,18].…”

Section: Introductionmentioning

confidence: 99%

Numerical modelling study of a modified sandbag system for ballistic protection

Thawani

Hazael

Critchley

2021

Journal of Computational Science

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Laboratory scale investigation of stress wave propagation and vibrational characteristics in sand when subjected to air-blast loading

Cited by 17 publications

References 33 publications

Mechanism and Application of Blasting Technology Using Phase-Difference Vibration Mitigation on Adjacent Railway Tunnel

Mechanism and Application of Blasting Technology Using Phase-Difference Vibration Mitigation on Adjacent Railway Tunnel

Effect of Adjacent Hole on the Blast‐Induced Stress Concentration in Rock Blasting

Numerical modelling study of a modified sandbag system for ballistic protection

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