Vertical Load and Settlement at the Foot of Steel Rib with the Support of Feet‐Lock Pipe in Soft Ground Tunnel

Chen, Lijun; Chen, Jianxun; Luo, Yanbin; Li, Yao; Hu, Taotao

doi:10.1155/2019/6186748

Cited by 6 publications

(3 citation statements)

References 21 publications

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“…Tao et al [3] studied the mechanism of feet-lock pipes in loess areas and proposed a pipe length of 3 meters and an angle of insertion of ±30°. Chen et al [4,5] proposed a reasonable angle of 45° for the pipe during the step excavation of a single tunnel. Yang et al [6] studied the reasonable installation angle of feet-lock pipes at each step during the excavation of a three-step tunnel.…”

Section: Introductionmentioning

confidence: 99%

Design Parameter Optimization of Feet-Lock Pipes for Small Space Tunnels in Jointed Rocks

Shi,

Yang,

Yang

et al. 2023

Advances in Frontier Research on Engineering Structures

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Feet-lock pipes are installed at the foot of steel arch to limit the displacement, improve the bearing performance of steel arch, and restrict the ground deformation during tunnelling. At present, studies on the design parameter optimization of feet-lock pipes in small-space tunnel are still in a lack, which impedes the application of this technology. In this study, based on a small-space tunnel project in Suzhou, China, the plane strain finite element analysis within the jointed rock constitutive model is conducted to investigate the optimum designs of inserting angle, length, and diameter of feet-lock pipes. Results show that the inserting angle has a significant influence on the supporting efficiency, and an optimal angle of 60° is recommended. The increase of pipe length can lead to the rise of the disturbed zone in the surrounding rock, and the design length is suggested to be below 4.5 m. The pipe diameter has limited influence on the reinforcement effect of tunnels.

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Section: Introductionmentioning

confidence: 99%

Design Parameter Optimization of Feet-Lock Pipes for Small Space Tunnels in Jointed Rocks

Shi,

Yang,

Yang

et al. 2023

Advances in Frontier Research on Engineering Structures

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“…At present, domestic and foreign scholars have carried out a series of studies on the mechanical characteristics of FLSP, utilizing theoretical analysis [9][10][11], numerical simulation [12][13][14], and field-test methods [15,16]. Chen et al [11] proposed an analytical method to predict the vertical load and settlement at the feet of steel ribs with the support of the feet-lock pipe and validated this method with the results of field measurements. Cui et al [14] explored the mechanism of action of foot-side reinforcement piles (FRSP) through model tests and numerical simulations and determined reasonable parameters.…”

Section: Introductionmentioning

confidence: 99%

Design Optimization Method of Feet-Lock Steel Pipe for Soft-Rock Tunnel Based on Load-Deformation Coordination

Tian

et al. 2022

Applied Sciences

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Feet-lock steel pipes have been widely applied in soft-rock tunnels, but their installation quantity and parameters depend on engineering experience. In this study, by simplifying the force between the feet-lock steel pipe and the primary lining, the load-deformation characteristics were analyzed separately, and inconsistent deformation was revealed. Next, combined with the passive and active bearing scheme, a design optimization method for feet-lock steel pipes was proposed under two working conditions, including the predicted large deformation and observed large deformation before the primary lining construction. Finally, the design method was applied to the Yulinzi Tunnel, and the results show that the original design of the feet-lock steel pipes could not meet the requirements of the controlling settlement. After the optimized design, both the passive bearing scheme installing two ϕ108 × 3-millimeter steel pipes and the active bearing scheme installing one ϕ108 × 4-millimeter steel pipe could meet the requirements of the controlling settlement. The active bearing design can significantly reduce the amount of steel required and the engineering cost. The scientificity and feasibility of the design optimization method were proven by the on-site monitoring and measurement.

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“…So, it is an important part of the primary support system in loess tunnel, and rationality of system anchor parameter design will directly affect the construction period and cost. Engineering practices show that the anchor has good applicability and can achieve good supporting effect in hard rock and soft rock [8][9][10].…”

Section: Introductionmentioning

confidence: 99%

Mechanical Characteristic and Length Optimization of System Anchor in Loess Tunnel Based on Field Measurement and Analytical Solution

Chen

Luo

2021

Mathematical Problems in Engineering

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In this paper, field measurement is used to obtain the force of system anchor in its actual working condition and stress situation of system anchors in different parts of loess tunnel is analyzed based on field test results, indicating the reasons why values of measured axial force of system anchor are different in different parts of loess tunnel. Based on the displacement solution of Mindlin problem, this paper deduces the analytical solution to stress distribution of system anchors in the sidewall of loess tunnel under the pull-out force, analyzes the distribution forms and influencing factors of shear stress and axial force. At the same time, analytical solutions to system anchor stress and surrounding rock plastic zone radius are tentatively applied to the analysis of stress characteristics and length optimization of system anchor in loess tunnel. The research results are of great significance to understand the mechanical characteristics of anchors in loess tunnel and to optimize the design of anchors in the primary support system of loess tunnel, which leads to accelerated construction progress and low economically cost, especially in loess tunnels with large cross section and long span.

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Vertical Load and Settlement at the Foot of Steel Rib with the Support of Feet‐Lock Pipe in Soft Ground Tunnel

Cited by 6 publications

References 21 publications

Design Parameter Optimization of Feet-Lock Pipes for Small Space Tunnels in Jointed Rocks

Design Parameter Optimization of Feet-Lock Pipes for Small Space Tunnels in Jointed Rocks

Design Optimization Method of Feet-Lock Steel Pipe for Soft-Rock Tunnel Based on Load-Deformation Coordination

Mechanical Characteristic and Length Optimization of System Anchor in Loess Tunnel Based on Field Measurement and Analytical Solution

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