Study on Internal Force of Tunnel Segment by Considering the Influence of Joints

Dong, Le; Yang, Zhiyong; Wang, Zhenyong; Ding, Yaowen; Qi, Weiqiang

doi:10.1155/2020/1020732

Cited by 11 publications

(4 citation statements)

References 24 publications

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“…However, shield tunnels inevitably pass through complex strata, even under buildings. Therefore, during the construction phase of shield tunneling, it is very important to ensure little deformation of the soil and good mechanical properties of the segments and to control the deformation and subsidence of buildings [6,7].…”

Section: Introductionmentioning

confidence: 99%

Analysis of Shield Tunnels Undercrossing an Existing Building and Tunnel Reinforcement Measures

Lou

Huang

2023

Applied Sciences

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Research on tunnel excavation has rarely considered the effect of the tunnel excavation on a complete building. Therefore, this paper considered a building with a double basement and piles, and a three-dimensional finite-element model for shield tunnels undercrossing an existing building was established to study the effects of the excavation of double-shield tunnels on the displacement and internal forces of soil, segments, piles, and buildings. Grouting reinforcement technology was used in the model to analyze the effect of grouting reinforcement on pile displacement and building subsidence. The results showed that for every 100 kPa increase in grouting pressure, the maximum subsidence of the soil was reduced by 3.512 mm. The successive excavation of double-shield tunnels resulted in elliptical segments. The longitudinal and transverse stresses of the segments were effectively reduced by grouting pressure of 250 kPa. The excavation of tunnels had an obvious nonlinear effect on the maximum lateral displacement of the piles along the direction of excavation and the maximum subsidence of the building. When using deep-hole grouting reinforcement, the maximum lateral displacement of piles and the maximum subsidence of the building were effectively reduced by increasing the radial grouting reinforcement radius and adjusting the reinforcement range.

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Section: Introductionmentioning

confidence: 99%

Analysis of Shield Tunnels Undercrossing an Existing Building and Tunnel Reinforcement Measures

Lou

Huang

2023

Applied Sciences

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“…Researchers have focused on investigating the behaviour of timber connections, which play a critical role in the overall performance and stability of timber structures [8,11,26,27]. The stiffness of a joint directly influences how internal forces and deformations are distributed within a structure [28,29]. The joints in timber structures are typically classified as pinned or moment joints (Figure 1).…”

Section: Introductionmentioning

confidence: 99%

The Quality Assessment of Timber Structural Joints Using the Coaxial Correlation Method

Kurtenoks,

Kurajevs,

Buka-Vaivade

et al. 2023

Buildings

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With the growing popularity of timber structures, the requirement for reliable and non-destructive methods to assess the quality and condition of structural joints becomes increasingly essential. A novel coaxial correlations method is investigated to assess the degradation of panel-to-panel moment joints in timber structures. The method involves analysing the response data obtained from accelerometers placed on both sides of the joint and comparing the readings to evaluate the joint’s condition. A specific joint solution to simulate the degradation of the moment joint in laboratory conditions is selected based on its simplicity and the ease with which its degradation can be simulated. The joint consists of angle brackets joined with timber screws and bolts to plywood panels. Gradually unscrewing the timber screws reduces the joint’s stiffness to simulate wear and tear over time. The experimental setup includes static loading and finite element modelling (FEM) to determine the rotational stiffness of the investigated joint at each degradation level. A dynamic experiment using vibration loading with sweep signal in the frequency range of 10 Hz to 2000 Hz is conducted to assess the quality of the joint. The conducted research provides valuable insights into the behaviour of timber panel-to-panel connections. The findings highlight the relationship between joint stiffness, vertical displacements, and the proposed dimensionless parameter, volume root mean square value (RMSvol), which offers a more comprehensive assessment of the joint’s condition in three spatial directions. As a result of the research, it has been established that, in the case of linear-type connections, unlike point-type joints, there is a possibility of signal scattering, so it is recommended that power comparisons and evaluations of the response signals from both accelerometers at the initial stage of applying the coaxial correlations method are performed.

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“…This expands the applicable scene of the modified routine method. Dong et al [9] aim at the problem that the calculation theory of shield segments is insufficient to study the joints. They consider the allowable deformation of the segment joint.…”

Section: Introductionmentioning

confidence: 99%

Study on the Influence of Internal Water Pressure on the Internal Force of Circular Hydraulic Tunnel Lining

Zhu

Cheng

2022

Applied Sciences

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The internal water pressure condition influences the internal force of the circular hydraulic tunnel lining. However, calculating the lining’s internal force of this type of tunnel still lacks practical theory. Based on the modified routine method and the theory of structural mechanics, the internal stress model of the tunnel section is established in this paper. The general calculation formula of lining internal force is deduced by considering arbitrary water level height and different water conveyance pressures. The formula is used to calculate the internal force of the lining under the action of internal water pressure and the influence laws of water level height and water conveyance pressure are explored, respectively. In addition, case analysis was carried out for several typical projects. The results show that the maximum internal force of the lining increases with the increase of water pressure and inner radius and the maximum internal force is in a fixed special position when the water is conveyed under pressure. When the water is conveyed without pressure, the internal force of the lining will increase with the increased water level. However, the maximum bending moment and axial force will reduce at the special water level. This calculation theory considering different working conditions of internal water pressure solves the calculation problem of the internal force of a circular hydraulic tunnel. It improves the design theory of tunnel structure and provides a theoretical basis for this type of tunnel’s structural design and safe operation.

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Study on Internal Force of Tunnel Segment by Considering the Influence of Joints

Cited by 11 publications

References 24 publications

Analysis of Shield Tunnels Undercrossing an Existing Building and Tunnel Reinforcement Measures

Analysis of Shield Tunnels Undercrossing an Existing Building and Tunnel Reinforcement Measures

The Quality Assessment of Timber Structural Joints Using the Coaxial Correlation Method

Study on the Influence of Internal Water Pressure on the Internal Force of Circular Hydraulic Tunnel Lining

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