A bottom-to-up drainage and water pressure reduction system for railway tunnels

Li, Pengfei; Liu, Hongchuan; Zhao, Yong; Li, Zheng

doi:10.1016/j.tust.2018.07.027

Cited by 41 publications

(14 citation statements)

References 14 publications

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“…Table 4 shows that when the equivalent diameters are 47mm, 27mm, and 27mm, the water pressure decrease for about 60%, 45%, and 30%, respectively, which indicates that the water pressure decreases with the increase of the equivalent diameter of drainage pipe. This result proves that if the drainage capacity of the drainage and water pressure reduction system is enough for a tunnel, the water pressure on the secondary lining will not increase too much, which agrees with the conclusion of Li (2018). If the drainage capacity of the drainage pipe for a tunnel is not enough for the water inflow of the construction region, the effect of the bottom-to-up drainage and water pressure reduction system will decrease, and it may even result in the damage of the tunnel due to the additional drainage measures in the bottom of the tunnel.…”

Section: Influence Of the Diameter Of The Drainage Pipesupporting

confidence: 86%

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Development and assessment of a water pressure reduction system for lining invert of underwater tunnels

Cheng

Liu

et al. 2019

Marine Georesources & Geotechnology

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In this study, the feasibility of a novel bottom-up drainage and water pressure reduction system for reducing the secondary lining external water pressure on tunnels has been validated by conducting laboratory evaluations. The tunnels environment including surrounding rock, lining, bottom drainage system and other supplementary components have been simulated to investigate the working pattern and efficiency of this drainage system. The drainage system has been further optimized by analyzing the measured

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Section: Influence Of the Diameter Of The Drainage Pipesupporting

confidence: 86%

“…To prevent the damage of the tunnel invert caused by water pressure, Li et al (2018) developed a novel bottom-to-up drainage and water pressure reduction system (Fig. 1) to reduce the water pressure that applies on the secondary lining.…”

Section: Introductionmentioning

confidence: 99%

Development and assessment of a water pressure reduction system for lining invert of underwater tunnels

Cheng

Liu

et al. 2019

Marine Georesources & Geotechnology

Self Cite

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“…The waterproofing system of monolithic tunnel is composed of concrete self-waterproofing and waterproofing sheets laid between primary support and secondary lining [18]. The leakage channels of tunnel structure mainly come from the joints formed by the construction of waterproof sheets, damage of waterproof sheets caused by binding and welding of steel bars in secondary lining, structure construction joints, deformation joints, cracks of linings and waterproof performance of concrete.…”

Section: Water Leakage In Subway Tunnelsmentioning

confidence: 99%

Analysis on Disease State of Urban Operational Subway Tunnels

Dong¹,

Huang²,

Ao³

et al. 2021

JCCEE

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Structure form, steel bar and service time were considered to be the main factors of the tunnel disease state, based on the disease inspection results of subway tunnels in Beijing. The conclusion indicated that the diseases of shield tunnel such as ovalization of tunnel cross section, lining cracks, crushing and dislocation of duct pieces and water leakage were caused by the deformation of segment joints. Lining crack was the main disease form in monolithic tunnel. The width and depth of cracks were greatly influenced by tunnel operation time and had the characteristics of discreteness and random. Steel bar used in concrete lining could significantly enhance safety of tunnel structures. Water leakage in subway tunnel was influenced by rainfall and usually could be observed at the gaps of tunnel structures, such as bolt holes and segment joint of shield tunnel or the construction joints, deformation joints and lining cracks of monolithic tunnel. The most lining cavities were found located at the vault and the cavity shape was similar to strip, square or oval with lining cracking nearby. The carbonation depth of lining concrete was proportional to tunnel operation time and its value and speed at ballast bed was most, sidewall less and vault least. It is hoped that the results can provide some reference for the disease law analysis and treatment of urban tunnel.

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“…Therefore, waterproof and drainage technology plays a crucial role in ensuring the safety of tunnel construction and operation [4]. In the design of tunnel waterproof, the waterproof board is usually adopted to set between the primary support and secondary lining [5], which isolates the water seepage from the stratum, reduces the constraint stress caused by the inconsistency of deformation, and improves the waterproof performance of the secondary lining concrete.…”

Section: Introductionmentioning

confidence: 99%

Experimental Investigation on Mechanical Characteristics of Waterproof System for Near-Sea Tunnel: A Case Study of the Gongbei Tunnel

et al. 2020

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The water around thenear-sea tunnels is supplied infinitely, and mechanical characteristics of the lining and movement joint are inevitably affected by waterproof methods. The research on the mechanical characteristics of the waterproof system is immature. As a case study of the Gongbei tunnel, a scale model was established in this study, and the stratum, pipe curtain, grouting circle, lining, waterproof board, and movement joint were simulated based on the similarity theories. By changing the externally applied water pressure and drainage discharge, the variation and distribution of the water pressure and strain on the lining with the fully wrapped waterproof (FWW) method, the lining with the partially wrapped waterproof (PWW) method, and the movement joint were investigated. Furthermore, several suggestions on the selection of the waterproof method were presented. The results indicate that the PWW method can reduce the water pressure and strain on the lining under the drained state. Under the state of free drainage, the strain on the lining with the PWW method may get a discount of about 30%. More attention could be paid to the waterproof of the movement joints in the construction process, especially the invert. The research results may offer some valuable insights into the waterproof design of similar near-sea tunnels.

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A bottom-to-up drainage and water pressure reduction system for railway tunnels

Cited by 41 publications

References 14 publications

Development and assessment of a water pressure reduction system for lining invert of underwater tunnels

Development and assessment of a water pressure reduction system for lining invert of underwater tunnels

Analysis on Disease State of Urban Operational Subway Tunnels

Experimental Investigation on Mechanical Characteristics of Waterproof System for Near-Sea Tunnel: A Case Study of the Gongbei Tunnel

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