Estimation of reinforcing effects of FRP-PCM method on degraded tunnel linings

Jiang, Yujing; Wang, Xiaoshan; Li, Bo; Higashi, Yukihiro; Taniguchi, Kenshi; Ishida, Kosei

doi:10.1016/j.sandf.2017.05.002

Cited by 38 publications

(13 citation statements)

References 31 publications

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“…The urethane material is utilized as the back-filling material due to its quick harden and high strength, and the mechanical properties of backfilling material and lining concrete are also summarized in Table 1. The mechanical behaviors of the interface between the FRP-PCM layer and the concrete layer are obtained based on a series of direct shear tests in our previous study [28], and those values are summarized in Table 2.…”

Section: Boundary Conditionsmentioning

confidence: 99%

Study on the Reinforcing Effects of the FRP-PCM Method on Tunnel Linings for Dynamic Strengthening

et al. 2021

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In recent years, fiber-reinforced plastic (FRP) has been widely used in the reinforcement of concrete structure fields due to its favorable properties such as high strength, low weight, easy handling and application, and immunity to corrosion, and the reinforcing effects with FRP grids on tunnel linings should be quantitatively evaluated when the tunnels encounter an earthquake. The aim of the present study is to estimate the reinforcing effects of fiber-reinforced plastic (FRP) grids embedded in Polymer Cement Mortar (PCM) shotcrete (FRP-PCM method) on tunnel linings under the dynamic load. A series of numerical simulations were performed to analyze the reinforcing effects of FRP-PCM method quantitatively, taking into account the impacts of tunnel construction method and cavity location. The results showed that the failure region on lining concrete is improved obviously when the type CII ground is encountered, regardless the influences of construction method and cavity location. With the increment of ground class from CII to DII, the axial stress reduction rate R σ increases from 13.18% to 48.60% for tunnels constructed by the NATM, while for those tunnels constructed by the NATM, R σ merely varies from 0.72% to 2.11%. R σ decreases from 43.35% to 34.80% when a cavity exists on the shoulder of lining, while decreasing from 14.7% to 0.12% when a cavity exists on the crown of lining concrete. All those conclusions could provide valuable guidance for the reinforcing of underground structures.

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Section: Boundary Conditionsmentioning

confidence: 99%

Study on the Reinforcing Effects of the FRP-PCM Method on Tunnel Linings for Dynamic Strengthening

et al. 2021

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“…The results show that the lining reinforced by R/ECC arch set has better structural bearing capacity and deformation performance, and shows excellent reinforcement effect in various damage states of lining reinforcement. In conclusion, many scholars have carried out more research on tunnel structure reinforcement and repair techniques, forming representative schemes such as the adhesive steel method [ 14 , 15 , 16 , 17 ], the paste fiber material method [ 18 , 19 , 20 , 21 ] and the cementitious reinforcement method [ 22 , 23 , 24 , 25 ], which can effectively improve the stress state of diseased tunnels and alleviate the defects and safety hazards caused by lining steel corrosion thickness reduction of lining steel.…”

Section: Introductionmentioning

confidence: 99%

Novel Reinforcing Techniques and Bearing Capacity Analysis for Tunnel Lining Structures with Extensive Corrosion

et al. 2023

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Affected by the erosive environment, tunnel lining concrete in the long-term service zprocess often exhibits engineering diseases such as concrete corrosion degradation and loss of strength, decreasing the stability of the tunnel lining structure and the traffic safety. Based on HTG tunnel project, the basic distribution rule of tunnel lining corrosion and macro mechanical properties of corroded concrete were explored in this paper through engineering disease site investigation. Then, on this basis, aiming at large-scale corrosion of tunnel lining structure, two reinforcement and repair schemes are proposed, corrugated steel plate reinforcement method and channel steel reinforcement method. Indoor component tests are carried out on the two reinforcement schemes. The failure characteristics and stress and deformation law of tunnel lining members after reinforcement and repair were verified. The analysis showed that the failure process of the reinforced specimens on the tensile side could be divided into the non-cracking stage and the working stage with cracks, and the cracking load and failure load of the specimens were significantly increased. The bearing capacity of the reinforced specimens was divided into the ultimate bearing capacity against cracking and the ultimate bearing capacity during failure. Finally, the calculation methods of the bearing capacity of the channel steel reinforcement method and the corrugated steel plate reinforcement method were derived. Comparative analysis shows that the results of numerical simulation, experimental testing and theoretical simplification methods are close to each other, and the maximum deviation is less than 8%. The established method for calculating the bearing capacity of corroded components after reinforcement is reliable and can be used for the design calculation of corroded lining reinforcement.

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“…With costs reducing and demand growing, more types of novel FRP products have been developed recently, such as the FRP tube [ 5 ], FRP grid [ 6 ], FRP steel composite tube [ 7 ], etc. These products have expanded the application scenarios of FRP composites in civil structures, for example, to high-rise and large-span structures [ 8 ], tunnel structures [ 9 ], marine structures [ 10 , 11 ], etc. During the retrofitting process for certain underwater structures (such as bridge piers or dams), traditional externally bonded FRP sheets and strips are inapplicable under these scenario due to the underwater environment restricting the application of most bonding materials.…”

Section: Introductionmentioning

confidence: 99%

Experimental Study on Compressive Behavior of Concrete Cylinders Confined by a Novel Hybrid Fiber-Reinforced Polymer Spiral

Tang

Wei

et al. 2022

Polymers

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Modern fiber-reinforced polymer (FRP)-reinforced concrete structures are excepted to achieve superior mechanical performances and long service lives, even in harsh service environments. Hybrid FRP material could potentially meet this goal with its relatively high strength-to-cost ratio. This paper presents an experimental study on the compressive behavior of concrete cylinders confined by a novel hybrid fiber-reinforced polymer (HFRP) spiral. Nine types, forming a total of 27 confined or non-confined concrete cylinders, were subjected to an axial compressive-loading test. Concrete cylinders confined either with different spiral types or different spiral spacings were comparatively studied in the experiment. The results showed that the compressive failure modes and the stress–strain relationships of the HFRP-spiral-confined cylinders were similar to those of basalt-fiber-reinforced polymer (BFRP)-spiral-confined cylinders. The actual fracture strain of the HFRP spiral (tested as a single rod) was larger than that of the corresponding carbon-fiber-reinforced polymer (CFRP) bar, indicating the advantageous composite effect of the HFRP spiral. The maximum strain of the HFRP spiral reached over 70% of its ultimate strain in the cylinders compared to the BFRP spiral, which only reached 50%. Most of the existing models overestimated the ultimate stress and strain of the HFRP-spiral-confined cylinders. Wu’s model was proved to be the most accurate model, yet proper modification was required for predicting the peak strain of the HFRP-confined cylinders.

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Estimation of reinforcing effects of FRP-PCM method on degraded tunnel linings

Cited by 38 publications

References 31 publications

Study on the Reinforcing Effects of the FRP-PCM Method on Tunnel Linings for Dynamic Strengthening

Study on the Reinforcing Effects of the FRP-PCM Method on Tunnel Linings for Dynamic Strengthening

Novel Reinforcing Techniques and Bearing Capacity Analysis for Tunnel Lining Structures with Extensive Corrosion

Experimental Study on Compressive Behavior of Concrete Cylinders Confined by a Novel Hybrid Fiber-Reinforced Polymer Spiral

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