Damage assessment of prefabricated prestressed channel slab under plane charge blast

Cai, Runze; Yan-zhao, LI; Zhang, Chunxiao; Qi, Hui; Mao, Jize; Pan, Yang; Liu, Hanchao

doi:10.1016/j.engstruct.2021.113021

Cited by 12 publications

(2 citation statements)

References 47 publications

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“…By combining the classical joint nonlinear normal deformation constitutive model (BB) and the cylindrical cavity Heelan solution [20,21], a delayed blasting model in the hole of fractured rock mass is constructed [22,23]. The stress change in the red particles on both sides of the joint interface is analyzed, where γ is the polar angle, a is the length of the joint, l is the length of the explosive column, c is the horizontal distance between the blast hole and the joint, b is the distance between the lower explosive column and the middle of blasting hole, and d is the radius of the explosives, as shown in Figure 1 below.…”

Section: Constitutive Model Of Fractured Rock Mass Blastingmentioning

confidence: 99%

Investigation of Rock Joint and Fracture Influence on Delayed Blasting Performance

Zhang,

Bai,

Sun

et al. 2023

Applied Sciences

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Geological structures such as joints and faults in rock mass have a significant influence on open-pit mining. Hence, it is critical to develop an understanding of dynamic joint behavior under blasting loading. This, in turn, can provide both theoretical and practical guidance to improve blasting rock fragmentation and associated bucket excavating efficiency. In this paper, delayed blasting on a highwall bench at an open-pit mine is used as an example; a nonlinear joint blasting model is also constructed. By simplifying the blasting wave propagation velocity and combining the relevant stress and displacement theories of type I and II cracks, equipotential diagrams of the stress and displacement field with the vibration velocity of the particle are obtained. Additionally, ANSYS is used to analyze the distribution of the stress field. This is able to be visualized by the degree of color change post-processing. It is concluded that, with the attenuation of the detonation wave energy, the stress exhibited a decreasing trend in this process. According to the distribution of the peak effective stress, it is found that the peak value first increases to 10–12 MPa and then shows a downward trend.

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Section: Constitutive Model Of Fractured Rock Mass Blastingmentioning

confidence: 99%

Investigation of Rock Joint and Fracture Influence on Delayed Blasting Performance

Zhang,

Bai,

Sun

et al. 2023

Applied Sciences

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“…In gas phase explosives, Webber, 3 Davis et al, 4 Kamlet and Jacobs, 5 Liu et al 6 had researched or tested findings that the propagation speed of this formation is generally 1500-4000 m/s, and the pressure at the final section of the explosion reaches several MPa, and the temperature reaches 2000-4000 K. Cai et al 7 made three prestressed concrete channel slabs according to a 1:3 reduction model, and carried out simulation tests under air explosion overpressure to obtain a partial load test value, which is closer to the finite element simulation value.…”

Section: Introductionmentioning

confidence: 99%

Failure analysis of gas explosion load based on structural impact failure characteristics

Yao

2023

Advances in Mechanical Engineering

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The purpose of this study is to obtain the peak of the gas explosion load which is affected by many factors and is not easy to determine. Explosion peak is a key factor in the time-load curve of the explosion field. In this paper, the static and dynamic modal analysis method of gas explosion fracture of reinforced concrete prefabricated slabs is used to obtain the static fracture, maximum reflective pressure applied and peak dynamic load of prefabricated plates. In the actual explosion study, all three prefabricated plates broke at one-third, and the peak dynamic load was 6.743 times the span buckling load in the plate. The analysis also shows that when plastic hinges appear at one-half, the above ratio is 3 times. The calculated peak is within the pressure range of the explosion test. The Baker model is used to fit the explosion time-load curve. This function is applied to the dynamic analysis of the finite element analysis of the explosion plate, and the failure of the plate is more consistent with the explosion case site. The median value of the explode field load time-load equation with the curve function can be applied to the rapid evaluation of post-explosion structure.

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Performance of meta concrete panels subjected to explosive load: Numerical investigations

Nguyen‐Van

Peng

Hazell

et al. 2023

Structural Concrete

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Research on strengthening and retrofitting of concrete structures against explosive loading has recently received much attention. This paper proposes a new type of reinforcement for concrete panels to enhance their blast‐resistant capacity. The reinforcement structure is naturally optimized with continuous nonself‐intersecting surfaces, known as triply periodic minimal surface (TPMS)‐primitive scaffold. A numerical model is developed to investigate the performance of TPMS‐primitive reinforced concrete panels against blast loading. The results are validated by experimental data from the literature on a traditional reinforced concrete slab. The concrete slabs reinforced with one, two, and four layers of TPMS‐primitive unit cells are designed and examined, while a quarter of the panel is simulated to reduce the computational cost. A constitutive model that considers the strain‐rate effect is employed to capture the rate‐dependent impulsive behavior of the proposed panels. The numerical results indicate significant enhancements in damage resistance and substantial reductions in deflection of the concrete reinforced panels when the TPMS‐primitive scaffold replaces the rebar lattice. The proposed reinforcement with multiple layers of unit cells retains high efficiency through parametric studies, while changes in the shell thickness of the reinforcement scaffold have limited effects on filtering blast waves.

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Damage assessment of prefabricated prestressed channel slab under plane charge blast

Cited by 12 publications

References 47 publications

Investigation of Rock Joint and Fracture Influence on Delayed Blasting Performance

Investigation of Rock Joint and Fracture Influence on Delayed Blasting Performance

Failure analysis of gas explosion load based on structural impact failure characteristics

Performance of meta concrete panels subjected to explosive load: Numerical investigations

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