Observed Ground Pressure Acting on the Lining of a Large‐Diameter Shield Tunnel in Sandy Stratum under High Water Pressure

Li, Xue; Zhou, Shunhua; Di, Honggui

doi:10.1155/2020/3091528

Cited by 8 publications

(4 citation statements)

References 16 publications

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“…The theoretical solution for the deformation and stress of the proposed lining structure is provided based on the internal and external pressure elastic ring theory. To solve the problem that conventional double-layered linings can hardly meet the design requirements when facing high internal water pressure conditions, Wang (2018), Huang (2020), Lin (2020) proposed a novel three-layer lining structure composed of a shield pipe sheet, self-compacting concrete liner, and a steel sleeve structure. They explored the force-deformation behavior and load-bearing performance based on component tests and finite element numerical analysis.…”

Section: Ec 416 1640mentioning

confidence: 99%

Investigation of a novel hydraulic tunnel composite lining with polyurea coating interlayer

Li,

Zhang,

Liu

et al. 2024

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PurposeMultilayer composite liner structures are the primary structural form of hydraulic tunnels. However, the bearing mechanism of multilayer composite liners has not been investigated thoroughly. Many existing design schemes do not properly achieve a balance between structural safety, anti-seepage capacity, and cost effectiveness. Thus, a new composite liner structure type and its theoretical model was proposed.Design/methodology/approachA novel hydraulic tunnel composite liner structure with a polyurea spray coating interlayer was proposed in this study. A theoretical model based on the state-space method was developed and verified using FEM models and existing theoretical models. Parametric analysis was conducted based on the theoretical model to investigate the influence of various variables, including interfacial shear stiffness, inner liner thickness, and outer liner elastic modulus.FindingsIt was concluded that the proposed theoretical model can be used successfully to calculate multilayer composite liner structures with high calculation efficiency. The overall deformation stiffness of the composite liner system increased with the interfacial shear stiffness. The sprayed coating interlayer significantly affects the residual force distribution between the outer and inner liners, which can also be affected by the adjustment of the thickness of the outer and inner liners. Thus, attention should be paid to these factors in the rational design of the proposed composite liner system.Originality/valueWith the development of China’s water conservancy projects, complex geological conditions, high surrounding rock stress, high internal and external water pressures, and other unique application scenarios have gradually increased. This places higher requirements on the bearing performance and impermeability of hydraulic tunnel lining structures. On the other hand, conventional hydraulic tunnel lining structures can hardly achieve a satisfactory balance between economy, structural safety, and impermeability. Thus, the proposed structure has the potential to be used in a wide range of applications.

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Section: Ec 416 1640mentioning

confidence: 99%

Investigation of a novel hydraulic tunnel composite lining with polyurea coating interlayer

Li,

Zhang,

Liu

et al. 2024

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“…Permeation grouting is an effective geotechnical consolidation technique commonly employed to improve the mechanical behavior of sandy soils. The technique consists of the injection of chemical mixtures, with very low pressure, into the voids of porous natural soils [6,7]. Many scholars conducted the effect of fine sand reinforcement by different materials [8,9].…”

Section: Introductionmentioning

confidence: 99%

Experimental Investigation on Reinforcement Application of Newly Permeable Polymers in Dam Engineering with Fine Sand Layers

Liu,

Shi,

et al. 2023

Water

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The grinding reinforcement of fine sand layers is a difficult problem in dam engineering construction. As a new type of grouting material, permeable polymer with excellent impermeability and high strength is widely used in dam engineering. In this paper, a series of compressive tests were designed considering different grouting pressures, curing days, moisture content, and porosity of fine sand. The influence of grouting parameters and sand layer conditions on the strength of fine sand layers reinforced by permeable polymers was analyzed. SEM and XDR tests were conducted to analyze the microscopic characteristics of the grouting stone. The functional calculation model of the strength and the influencing factors was established to explore the main factors influencing grouting stones. The compressive strength of grouted stones increases rapidly from the 7th to the 14th day, reaching about 96% of the maximum strength. The degree of influence of different factors is grouting pressure > moisture content > porosity. The compressive strength of the grouted stones increases with the increase of grouting pressure and the number of curing days. The compressive strength decreases with the sand layer’s increasing moisture content and porosity.

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“…Rouhanifar Salman et al [18] studied the strength and deformation behavior of sand rubber mixtures by using the loose specimens with a void ratio of 0.86, corresponding to a relative density of 30% for the pure sand, and normal stresses of 50, 100, and 150 kPa. Xue Li et al [19] measured and analyzed the Earth pressure and water pressure on the tunnel lining of four cross-sections of a metro tunnel, then compared with the theoretical values, and found that the values and distribution of observed ground pressure acting on the lining are different for different overburden depths. Mingfeng Lei et al [20] proposed a heterogeneous equivalent beam model (HEB model) of the shield tunnel segment structure based on a systematical analysis of the stress state of the cross section of segment joints.…”

Section: Introductionmentioning

confidence: 99%

Analysis of Structural Response of Subway Shield Tunnel Lining under the Influence of Cavities

Shi

Chen

Wei

et al. 2021

Advances in Civil Engineering

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The existence of cavities behind the shield tunnel lining can cause cracking, broken pieces, water leakage, and other problems, which reduces the durability and safety of the shield tunnel segment structure. In order to clarify the mechanism of cavity damage, a more systematic study of the effects of cavities on the shield tunnel lining structure from the angle, depth, and the number of cavities is carried out using model tests and numerical simulations without considering the effects of the stiffness reduction effect at the tunnel segment joints and groundwater seepage in this paper. The findings show that the bending moment value and the cavity angle value are approximately linear with the increase of single cavity angle, and the bending moment at the vault arch is reversed when the angle of the cavity behind the arch is greater than 30°. With the increase of single cavity depth, the axial force and bending moment at the cavity increase, and the distribution of bending moment remains unchanged, and the bending moment tends to be stable and unchanged beyond a certain depth. With the increase of single cavity angle and depth, the structural safety coefficient of the segment decreases, and the degree of influence is angle value > depth value. The existence of multiple cavities intensifies the influence of each cavity on the segment, especially when there are cavities behind the top and bottom of the vault; the bending moment value of the top of the vault increases by 22.53% compared with that of the single cavity condition.

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Observed Ground Pressure Acting on the Lining of a Large‐Diameter Shield Tunnel in Sandy Stratum under High Water Pressure

Cited by 8 publications

References 16 publications

Investigation of a novel hydraulic tunnel composite lining with polyurea coating interlayer

Investigation of a novel hydraulic tunnel composite lining with polyurea coating interlayer

Experimental Investigation on Reinforcement Application of Newly Permeable Polymers in Dam Engineering with Fine Sand Layers

Analysis of Structural Response of Subway Shield Tunnel Lining under the Influence of Cavities

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