The variation of load diffusion and ballast bed deformation with loading condition: an experiment study

Fu, Longlong; Tian, Zhekan; Zheng, Yuexiao; Ye, Weitao; Zhou, Shunhua

doi:10.1080/23248378.2021.1897958

Cited by 18 publications

(5 citation statements)

References 30 publications

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“…More precisely, the internal and initial supports merge to form a comprehensive framework in conjunction with the shed, creating a "shed-frame" system [36]. In this configuration, excavation-induced earth pressures are conveyed through micro-arches between the pipes, exerting force upon the system [37,38]. Such an arrangement facilitates a collaborative response of the system to control and withstand the released pressures effectively.…”

Section: Support Systemmentioning

confidence: 99%

Exploring the feasibility of prestressed anchor cables as an alternative to temporary support in the excavation of super-large-span tunnel

Zhou,

Jin,

Tian

et al. 2024

Railw. Eng. Sci.

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Excavating super-large-span tunnels in soft rock masses presents significant challenges. To ensure safety, the sequential excavation method is commonly adopted. It utilizes internal temporary supports to spatially partition the tunnel face and divide the excavation into multiple stages. However, these internal supports generally impose spatial constraints, limiting the use of large-scale excavation equipment and reducing construction efficiency. To address this constraint, this study adopts the “Shed-frame” principle to explore the feasibility of an innovative support system, which aims to replace internal supports with prestressed anchor cables and thus provide a more spacious working space with fewer internal obstructions. To evaluate its effectiveness, a field case involving the excavation of a 24-m span tunnel in soft rock is presented, and an analysis of extensive field data is conducted to study the deformation characteristics of the surrounding rock and the mechanical behavior of the support system. The results revealed that prestressed anchor cables integrated the initial support with the shed, creating an effective “shed-frame” system, which successively maintained tunnel deformation and frame stress levels within safe regulatory bounds. Moreover, the prestressed anchor cables bolstered the surrounding rock effectively and reduced the excavation-induced disturbance zone significantly. In summary, the proposed support system balances construction efficiency and safety. These field experiences may offer valuable insights into the popularization and further development of prestressed anchor cable support systems.

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Section: Support Systemmentioning

confidence: 99%

Exploring the feasibility of prestressed anchor cables as an alternative to temporary support in the excavation of super-large-span tunnel

Zhou,

Jin,

Tian

et al. 2024

Railw. Eng. Sci.

Self Cite

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“…After that, the support stiffness of the ballast bed, at the initial state, after tamping, and after stabilizing, can be calculated using Eq. (1).…”

Section: Support Stiffness Testmentioning

confidence: 99%

“…In recent years, rail transit infrastructure has been developed rapidly over the world. Due to the advantages of low cost and easy maintenance and repair [1][2], ballast tracks are the most used track structure for new lines, which have been widely adopted by railways in various counties, including heavy-haul railways and high-speed railways in special zones (long bridges, elevated stations, underground goaves, etc.) [3][4][5].…”

Section: Introductionmentioning

confidence: 99%

Experimental analysis of ballast bed state in newly constructed railways after tamping and stabilizing operation

Xiao

Zhang

Zhu

et al. 2023

Construction and Building Materials

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“…It follows from the above that rail pads have nonlinear, quasi-static elastic characteristics, as described in several works [ 3 , 5 , 6 ]. This nonlinear characteristic of the rail pad, together with the non-linear elastic characteristic of the ballast and subgrade [ 5 , 7 , 8 ], determine the specific shape of the load-deformation curve of the track [ 9 , 10 , 11 , 12 ]. Additionally, the dynamic behaviour of the rail pad exhibits nonlinear aspects in terms of the frequency response function [ 3 , 13 , 14 , 15 , 16 , 17 , 18 ].…”

Section: Introductionmentioning

confidence: 99%

Parametric Study of the Influence of Nonlinear Elastic Characteristics of Rail Pads on Wheel–Rail Vibrations

2023

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The rail pad is the elastic element between the rail and the sleeper that has the role of absorbing the mechanical stresses from the rail and reducing the vibrations and shocks generated by wheel–rail interactions. In this paper, the problem of the influence of the variability of the nonlinear load-deformation characteristic of rail pads (resulting from the manufacturing process) on wheel–rail vibrations is investigated. The limit load-deformation characteristics of a manufactured rail pad and the medium load-deformation characteristic resulting as the arithmetic mean of the two are considered. The nonlinear load-deformation characteristic of the ballast is also considered. All these characteristics are approximated with the help of the bilinear function and are implemented in a track model consisting of an infinite Euler-Bernoulli beam placed on a two-elastic layer continuous foundation with inertial insertion, resulting in a model with an inhomogeneous foundation. The parameters of the inhomogeneous foundation are established from the equilibrium condition under a static load. Wheel–rail vibrations are studied in terms of the contact force and the acceleration of the rail and wheel. The influence of the variability of the elastic characteristics of the rail pad manifests itself in the field of medium frequencies, which amplify or attenuate the vibration levels in certain bands of one-third of an octave.

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The variation of load diffusion and ballast bed deformation with loading condition: an experiment study

Cited by 18 publications

References 30 publications

Exploring the feasibility of prestressed anchor cables as an alternative to temporary support in the excavation of super-large-span tunnel

Exploring the feasibility of prestressed anchor cables as an alternative to temporary support in the excavation of super-large-span tunnel

Experimental analysis of ballast bed state in newly constructed railways after tamping and stabilizing operation

Parametric Study of the Influence of Nonlinear Elastic Characteristics of Rail Pads on Wheel–Rail Vibrations

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