Computational performance evaluation of sacrificial protective walls composed of lightweight concrete blocks: a parametric study of blast loads in a tunnel

Mohammadi, Payam Keshavarz Mirza; Khalilpour, Seyed Hamed; Parsa, Hasan; Sareh, Pooya

doi:10.1080/15376494.2022.2125134

Cited by 8 publications

(4 citation statements)

References 32 publications

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“…At present, although scholars have made several eforts in studying the blasting propagation law, most of the studies are based on on-site monitoring data and simplifed empirical formulas, which are too idealistic and lack accuracy in refecting the actual engineering blasting vibration situation [8][9][10]. At the same time, some scholars also use new research methods to study the blasting vibration law, such as using neural network technology [11][12][13], signal noise reduction [14,15], transient fnite element analysis [16], coupled Lagrange and Euler [17], Jones-Wilkins-Lee (JWL) equation of state [18], and wavelet packet decomposition [19] to summarize the blasting vibration law. However, these methods ignore the infuence of vibration frequency and duration, resulting in certain limitations.…”

Section: Introductionmentioning

confidence: 99%

Analysis of the Tunneling Blast Safety Criterion Based on Longitudinal Shocks

Wang

Zhao

Zhou

et al. 2023

Shock and Vibration

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In modern tunneling construction, the blasting seismic effect seriously threatens the safety and stability of the existing engineering construction. Meanwhile, due to the complexity of blasting loading, there is a very large difference from real blasting by using the sample triangle dynamic loading model or trapezoid dynamic loading model to analyze the blasting vibration problem. In this paper, based on the analysis of the pressure change, volume expansion, fracture development, and blasting gas motion, an accurate blasting loading model was proposed. Then, adopting plane longitudinal shock theory, the coupled loading of multiple holes can be obtained. Subsequently, the 3D simulation analysis of the tunnel blasting shows an error of 2% compared with on-site monitoring data, meeting engineering requirements. Finally, based on the simulation results, regression prediction function of the velocity curve and effective tensile stress curve under different safety criteria are established, achieving accurate prediction of the damage degree of the host rock and liner line under different engineering requirements.

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Section: Introductionmentioning

confidence: 99%

Analysis of the Tunneling Blast Safety Criterion Based on Longitudinal Shocks

Wang

Zhao

Zhou

et al. 2023

Shock and Vibration

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“…Moreover, they optimized flat steel explosion-proof doors by the application of inner stiffening profiles 20 . They also used barriers in different configurations and shapes 21 and sacrificial protective walls composed of lightweight concrete blocks 22 to attenuate blast waves in tunnels.…”

Section: Introductionmentioning

confidence: 99%

Protective water curtains as wave attenuators for blast-resistant tunnels

Mohammadi

Khalilpour

Parsa

et al. 2022

Sci Rep

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Tunnels, as highly cost-demanding infrastructures which facilitate the transportation of people and goods, have been a target of terrorist attacks within the past few decades. The significance of the destructive impact of explosives on these structures has resulted in research on the development of blast-resistant design approaches. In this paper, water curtains are proposed as a blast-resistant system due to the established performance of water against explosives in free fields in previous studies as well as its capability to mitigate the potential incoming fire after an explosion. A parametric study was conducted for this purpose, considering the effects of curtain thickness, the distance of the curtain from the tunnel opening, and the amount of TNT charge. Accordingly, fifty-two finite element (FE) models were created in the FE package ABAQUS to investigate the performance of a water wall in a typical tunnel through the Eulerian approach to simulation. The water curtains had four different thicknesses and were located at three different distances from the reference point. TNT explosive charges were placed at the tunnel opening with four different masses. The thicker walls nearer to the tunnel opening were found to be more effective. However, the peak pressure reduction in all charges was in a desirable range of 53 to 80%. The parametric study also illustrated that the peak pressures were more sensitive to wall thickness rather than TNT charges mass and the wall distance from the explosives. We anticipate this preliminary study to be a starting point for the further development of the concept of water curtains for blast mitigation.

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“…In another study, they proposed protective walls composed of lightweight concrete blocks to reduce the blast wave maximum pressure. They studied the impact of wall location and reported a significant reduction of pressure when the wall is located between 10 to 30 m from the explosive charge 30 . In another study, they investigated the use of barriers with different shapes, sizes, and arrangements in a tunnel, resulting in up to 50% reduction in the blast pressure waves 31 .…”

Section: Introductionmentioning

confidence: 99%

“…They studied the impact of wall location and reported a significant reduction of pressure when the wall is located between 10 to 30 m from the explosive charge. 30 In another study, they investigated the use of barriers with different shapes, sizes, and arrangements in a tunnel, resulting in up to 50% reduction in the blast pressure waves. 31 Keshavarz et al 32,33 evaluated the performance of water and concrete walls under blast loading considering various physical and mechanical parameters.…”

mentioning

confidence: 99%

Simulating the response of buried structures to external blast loads: Methods, challenges, and advances

Mohammadi

Khalilpour

Sareh

2022

Engineering Reports

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Various methods have been proposed to ensure the serviceability of buried structures such as road tunnels, urban utility tunnels, water conduits, underground shelters, and deposition chambers against extreme loads, the most common of which are experimental and computational methods. An external explosion in the vicinity of such structures is one of these extreme loads. In general, different types of external blasting for buried structures can be classified as surface blasting, coupled or uncoupled buried explosions, excavation by drilling and blasting near the structure, and the accidental detonation of explosive depositions. Laboratory or field tests for explosions are usually limited by financial and safety constraints; therefore, numerical simulations are often regarded as a vital tool in the study of such problems. Though computer software and hardware have improved rapidly in recent decades, and various numerical solvers have been developed, there is no universal method for solving all external explosion problems. Each numerical method can produce sensible results under certain conditions and assumptions, along with its limitations in computational cost. Consequently, these problems have been particularly difficult to investigate, and even in some cases, the results of different studies seem to be inconsistent. Besides providing an extensive review of the available literature in the field of numerical simulation of external explosions near buried structures and a discussion of the damage criteria associated with such explosions, this study also highlights some inconsistencies that may need further investigation.

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Computational performance evaluation of sacrificial protective walls composed of lightweight concrete blocks: a parametric study of blast loads in a tunnel

Cited by 8 publications

References 32 publications

Analysis of the Tunneling Blast Safety Criterion Based on Longitudinal Shocks

Analysis of the Tunneling Blast Safety Criterion Based on Longitudinal Shocks

Protective water curtains as wave attenuators for blast-resistant tunnels

Simulating the response of buried structures to external blast loads: Methods, challenges, and advances

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