Effect of Deficiencies in the Tunnel Crown Thickness on Pressure Tunnels with Posttensioned Concrete Linings

Qin, Gan; Cao, Shengfei; Yang, Fan

doi:10.1155/2018/2757542

Cited by 7 publications

(3 citation statements)

References 19 publications

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“…However, during the water filling test before the operation of the tunnel, a large area of leakage occurred in some tunnel sections. According to the comprehensive investigation, it was caused by the insufficient thickness of the inner prestressed lining crown for which the design thickness was 0.45 m (Qin et al, 2018). As shown in Figure 14, to eliminate the adverse effect of the insufficient thickness of the lining structure and ensure that the water conveyance plan of the project was realized on schedule, some reinforcement schemes were formulated with different degrees of insufficient thickness.…”

Section: Case Study Tunnelmentioning

confidence: 99%

Stress Transferring Mechanism of a Pressure Tunnel Lining Strengthened with CFRP

Qin

Yang

Jin³

2021

Lat. Am. j. solids struct.

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This paper investigates the stress transferring mechanism of a pressure tunnel strengthened with CFRP. A simplified mechanical model of the internal water pressure transfer from the CFRP to the lining concrete is established, and the key parameters that influence the internal water pressure transfer between the CFRP and lining concrete are identified. A solid-spring-solid three-dimensional finite element model is established. Using the numerical model, the influences of the above key parameters on the ratios of the internal water pressure borne by the concrete and CFRP are investigated. Based on the above results, a reinforcement scheme of the Yellow River Crossing Tunnel is studied and optimized as a case study. This reveals that the elastic modulus and thickness of the CFRP are the two most important factors that affect the ratios of the internal water pressure borne by the concrete and CFRP, and increasing the elastic modulus and thickness of the CFRP can decrease the ratio of the internal water pressure borne by the concrete and improve the stress state of the lining concrete.

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Section: Case Study Tunnelmentioning

confidence: 99%

Stress Transferring Mechanism of a Pressure Tunnel Lining Strengthened with CFRP

Qin

Yang

Jin³

2021

Lat. Am. j. solids struct.

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“…The dimensions of the finite element model are based on boundary convergence study. Initially, the thickness of tunnel lining has been kept as 0.22 m 7,28‐30 and later, it has been varied as 0.35 m, 31 0.45 m, and 0.55 m. Four different depths of overburden have been considered in the present analysis are 5 m, 7.5 m, 10 m, and 12.5 m and the tunnel has a diameter of 6 m.…”

Section: Finite Element Modelingmentioning

confidence: 99%

The response of rock tunnel when subjected to blast loading: Finite element analysis

Zaid

Sadique

2020

Engineering Reports

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In the past few decade tunnels were targeted to explosives and that resulted in sizeable structural damage. The increase in the strategic importance of tunnel construction has increased the demand for the blast‐resistant design approach. The present paper considered an internal blast loading on a rock tunnel constructed in Quartzite rock. A three‐dimensional finite element model of the tunnel has been developed in Abaqus. The diameter of the tunnel has been kept constant to a two‐lane transportation tunnel. However, the thickness of the concrete liner, depth of overburden, and mass of explosive charge has been varied to understand the response in different possible conditions. The Jones‐Wilkins‐Lee, Concrete Damage Plasticity, and Mohr‐Coulomb material models have been used for the modeling of trinitrotoluene, concrete, and rock respectively. Blast has been formulated through Coupled‐Eulerian‐Lagrangian technique. The tunnel at 12.5 of the depth of overburden has been found 2.7‐times more blast resistant than 5 m. Moreover, the extent of damage in shallow depth tunnels found to be more than the tunnels at higher depth of overburden.

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“…As a key aspect in the engineering of highway routes, the technology for building tunnels has gradually improved over time [1][2][3]. Shed tunnel protection structures are special tunnel structures.…”

Section: Introductionmentioning

confidence: 99%

Theoretical Analysis of Rockfall Impacts on the Soil Cushion Layer of Protective Structures

Wang

Xia

Zhou

2018

Advances in Civil Engineering

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During the Wenchuan Earthquake, with a magnitude of 5.12, collapses and rockfall hazards persisted for a long time after the initial investigations carried out by research fellow S. M. He and his team at the scene of the disaster in October 2008. It is possible that additional incidents of rockfalls in large quantities may continue in the same areas over the next ten to fifteen years. Furthermore, in the vast mountainous region of western China, the topographic relief is evident, and earthquakes occur frequently. Therefore, it is difficult to effectively defend against rockfall hazards. When designing protective structures, the key issue is the analysis of the mechanical response mechanism of the soil cushion layer of the upper cushion when subjected to the impact of rockfall. As such, a theoretical method was used to perform such an analysis. The cavity expansion and energy conservation model were adopted. Analytical solutions for the impact force and penetration depth were then derived. Furthermore, the impact force and penetration depth of rockfall were studied with the LS-DYNA software to obtain values for the impact forces and the penetration depth. Finally, the reliability of the theoretical method was evaluated using the cavity expansion, energy conservation, numerical simulation, Hertz, Japanese, Swiss, Australian, B. S. Guan, tunnel manual, and subgrade methods based on an engineering model. The results show that the cavity expansion and the energy conservation methods yielded consistent results. Meanwhile, the cavity expansion and the energy conservation methods also yielded consistent results with the numerical simulation, Japanese (obtained by laboratory experiment), Swiss (obtained by laboratory experiment), and Australian (obtained by field experiment) methods. The relevant methods and conclusions shall therefore be applied to the design of rockfall protection structure in future investigations.

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Effect of Deficiencies in the Tunnel Crown Thickness on Pressure Tunnels with Posttensioned Concrete Linings

Cited by 7 publications

References 19 publications

Stress Transferring Mechanism of a Pressure Tunnel Lining Strengthened with CFRP

Stress Transferring Mechanism of a Pressure Tunnel Lining Strengthened with CFRP

The response of rock tunnel when subjected to blast loading: Finite element analysis

Theoretical Analysis of Rockfall Impacts on the Soil Cushion Layer of Protective Structures

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