Blast responses of polyurea retrofitted utility tunnel reinforced with basalt fibre reinforced polymer bars

Zhou, Jiannan; Chen, Xiao-shuo; Zhou, Yinzhi; Wang, Wen-ye; Wang, Peng; Kong, Xinli; Xu, Ying; Geng, Hansheng; Jin, Fengnian

doi:10.1016/j.dt.2021.03.024

Cited by 16 publications

(12 citation statements)

References 22 publications

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“…High-strength and high-modulus polymer composites are produced by reinforcing the polymer matrix with high-strength and high-modulus fibers, the reinforcing fibers are employed to increase the strength and stiffness of the material, and the load is transferred to the fibers via the viscoelastic displacement of the matrix under stress [74]. The reinforcing fibers that are commonly used for enhancing performance are glass fiber (GF) [20,39,[70][71][72][73]75], basalt fiber (BF) [22,23,76,77] and carbon fiber (CF) [78][79][80][81]. GF are of two types: chopped glass fiber and milled glass fiber (MG), of which MG is mostly used as reinforcing and filling media in plastic composites, adhesives and coatings.…”

Section: Incorporation Of Reinforcing Materialsmentioning

confidence: 99%

“…Nevertheless, the study by Fallon et al did not consider the role of adhesion between the polyurea and the substrate, and the polyurea coating they used was pre-sprayed and pasted on the impact surface of the specimen. In contrast, the adhesion between the coating and the substrate is considered by many researchers to be an important indicator in the blast and impact resistance of polyurea [34,77,110]. For autoclaved aerated concrete (AAC), Chen et al [104] employed carbon-fiberreinforced plastics (CFRP) and polyurea to provide a total thickness of 4 mm polyurea coating on the top, bottom and sides of AAC.…”

Section: Protection Of Civil Engineering Structuresmentioning

confidence: 99%

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Polyurea for Blast and Impact Protection: A Review

et al. 2022

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Polyurea has attracted extensive attention from researchers and engineers in the field of blast and impact protection due to its excellent quasi-static mechanical properties and dynamic mechanical properties. Its mechanical properties and energy absorption capacity have been tuned by means of formulation optimization, molecular dynamics (MD) simulation and the addition of reinforcing materials. Owing to the special molecular structure of polyurea, the mechanism of polyurea protection against blasts and impacts is the simultaneous effect of multiple properties. For different substrates and structures, polyurea needs to provide different performance characteristics, including adhesion, hardness, breaking elongation, etc., depending on the characteristics of the load to which it is subjected. The current article reviews relevant publications in the field of polyurea blast and impact protection, including material optimization, protection mechanisms and applications in blast and impact protection.

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Section: Incorporation Of Reinforcing Materialsmentioning

confidence: 99%

Section: Protection Of Civil Engineering Structuresmentioning

confidence: 99%

Polyurea for Blast and Impact Protection: A Review

et al. 2022

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“…Some researchers have investigated this effect on the response of the structure or the medium comparing the results obtained by different charge weights 14,28,35,51,78–85 . Some references investigated this issue experimentally 3–5,86–89 . Another case in which the charge weight is important is the crater size resulting from the surface explosions.…”

Section: Effective Parameters Of External Explosion Loads On Buried S...mentioning

confidence: 99%

“…Moreover, the failure modes of urban utility tunnels with and without BFRP reinforcement are presented in References 4,5, respectively. The authors in Reference 3 visually investigated the damage to polyurea retrofitted utility tunnels.…”

Section: Failure Criteria For Buried Structuresmentioning

confidence: 99%

“…publications in this field emphasize the safety of urban structures. Among the various applications of this topic are safety assessment of transportation and metro tunnels, 1 civil air defense tunnels, 2 urban utility tunnels, [3][4][5] underground pipelines, [6][7][8][9][10][11][12][13] culverts, 14 as well as safety assessment in excavations near the existing tunnels [15][16][17][18][19][20][21][22] or the extension of tunnels, [23][24][25] and safe storage of explosives. 26 These structures have different cross-sections depending on their function, design, and construction technology 27 as depicted in Figure 1A.…”

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confidence: 99%

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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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Behaviors of arched tunneling segments reinforced by basalt fiber reinforced plastic rebars

Hou,

Feng,

Jiang

et al. 2024

Polymer Composites

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In this research, basalt fiber reinforced plastic (BFRP) rebars reinforced tunneling segment (BRRTS) technique was developed. All the BFRP rebars were designed, pre‐cured according to the reinforcement design and the reinforcement drawing of steel rebars reinforced concrete tunneling segments (SRRTSs). Two criteria, the equal reinforcement ratio criterion (ERRC) and the half stiffness principle (HSP), were applied to design the BRRTs. Bending experiments were performed to reveal the deformation, damage and load carrying capacity of the BRRTSs. With flexural‐shearing coupling failure mode, the BRRTS has longer elastoplastic deformation and comparable (ERRC) or much greater (HSP) load carrying capacity compared with traditional SRRTS, indicating that the BRRTS can replace the SRRTS in some cases.Highlights BFRP rebars reinforced tunneling segment was designed, constructed, and tested. BFRP rebars reinforced tunneling segment has long ductile deformation. BFRP rebars reinforced tunneling segment has higher load‐bearing capacity. Utilization efficiency of BFRP rebars varies from 0.565 to 0.646.

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Blast responses of polyurea retrofitted utility tunnel reinforced with basalt fibre reinforced polymer bars

Cited by 16 publications

References 22 publications

Polyurea for Blast and Impact Protection: A Review

Polyurea for Blast and Impact Protection: A Review

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

Behaviors of arched tunneling segments reinforced by basalt fiber reinforced plastic rebars

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