Investigation on the engineering effects of the geometrical configuration of the jacking rectangular pipe

Ma, Peifeng; Shimada, Hideki; Sasaoka, Takashi; Moses, Dyson; Matsumoto, Fumihiko; Chen, Xuehua

doi:10.1016/j.tust.2021.104239

Cited by 18 publications

(8 citation statements)

References 35 publications

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“…In order to maximize the use of shallow underground spaces to meet the needs of urban underground facilities, long-distance projects have gradually increased in recent years, resulting in higher accuracy requirements for the evaluation of jacking forces. However, in practice, it has been found that the resistance calculations based on circular pipe jacking have obvious errors, which increases the cost of auxiliary facilities and creates construction challenges [4,5].…”

Section: Introductionmentioning

confidence: 99%

A Segmented Calculation Method for Friction Force in Long-Distance Box Jacking Considering the Effect of Lubricant

Zhang,

Liu

et al. 2024

Applied Sciences

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In box jacking, injecting lubricant around the box is an essential method to reduce excessive friction forces caused by the interaction between the box and soil. This method introduces complexity to factors controlling the friction forces, such as the pipe-soil contact state, earth pressure, and friction coefficient. In particular, during long-distance construction, different lubricant conditions come into play. These intricate scenarios hinder the accurate estimation and control of friction force throughout the entire construction period. This study analyzed the variation patterns of frictional resistance based on monitoring data from two actual cases. The lubricant condition changes during the long-distance jacking process were categorized, the effect of lubricant actions on factors controlling friction force in each segment was discussed, and a new method for calculating friction forces by partitioning the long-distance box jacking was proposed. This approach aims to enhance the prediction accuracy and was compared with the results obtained from existing models. The rationality of the new model was further validated by combining numerical simulation results with field data. The results indicate that the proposed segmented calculation model demonstrates better prediction accuracy when facing variations in actual construction conditions. It can serve as a reference for the process design and construction control of long-distance box jacking.

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Section: Introductionmentioning

confidence: 99%

A Segmented Calculation Method for Friction Force in Long-Distance Box Jacking Considering the Effect of Lubricant

Zhang,

Liu

et al. 2024

Applied Sciences

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“…For the effect of excavating a new tunnel underpass on the mechanical properties of an existing tunnel, researchers often study it through theoretical derivation [9][10][11], model testing [12][13][14] and numerical simulation [15][16][17][18][19].…”

Section: Introductionmentioning

confidence: 99%

Investigation on the Mechanical Characteristics of Excavation of Double-Line Highway Tunnel Underpass Existing Railway Tunnel under the Influence of Dynamic and Static Load

Li,

Huang,

et al. 2024

Preprint

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The research on the excavation mechanical properties of underpass tunnels has already had certain results, but fewer of them consider the effects of dynamic and static loads on the excavation mechanical properties of underground tunnels at the same time, especially the lack of research cases of double-line highway tunnels with angled underpasses of existing railway tunnels. In this paper, based on the tunnel project of the new double-line Shiqian Highway Tunnel passing under the Hurong Railway at an oblique angle, the mechanical parameters of the rock body in the cross-tunneling area under the influence of static and dynamic load coupling are obtained by using the disturbance quantification coefficients and the Hoek-Brown criterion based on the method of over-advanced geological prediction and the investigation of the surrounding rock on the palisade face, and the engineering-scale finite element model is constructed and the mechanical characteristics of the excavation in the tunnel of the double-lane highway tunnel passing under the existing railroad under the influence of the static and dynamic loads are analyzed. The results show that: the new tunnel rock movement law for the top of the arch sinking, bottom plate bulging, side wall to move outward, the height and width of the arch and bottom plate arch with the tunnel excavation and increase, the side wall rock displacement effect is smaller; left and right lines of the tunnel disturbed area of the rule of change is similar; the existing tunnel bottom plate displacement is more than the top plate and the left and right side walls by the excavation of the time step influence is larger. Typical profile displacement is mainly determined by the distance from the excavation surface; the new tunnel in the four types of calculation conditions of the rock disturbance angle is the same; the existing tunnel roof and side wall Von Mises stress extreme occurs in the tunnel structure, the bottom plate there are pressure relief and pressure-bearing areas; based on the displacement control criteria, the recommended upper and lower step blasting method.

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“…Through three-dimensional numerical simulation, Zhang et al [7] studied the influence of different construction stages on roadways and subway tunnels during pipe-jacking construction. Ma et al [8] analyzed the response of jacking rectangular pipes with different geometric parameters to the ground and their stress state in the construction of the pipejacking method. Cheng et al [9] analyzed the variation law of the parameters of shallowburied, large-section box-jacking tunnels through on-site monitoring data, and studied the supporting effect of conditional soil in the process of box jacking by establishing a fine three-dimensional numerical model.…”

Section: Introductionmentioning

confidence: 99%

Effect of Undercrossing Shield Tunnels Excavation on Existing Rectangular Pipe-Jacking Tunnels

He,

Yang,

Zhang

2023

Applied Sciences

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Shield tunneling underneath existing rectangular pipe jacking can often lead to uneven settling. To solve the problem of excessive deformation of the existing underground pedestrian passages, excavated via the rectangular pipe-jacking method due to the adjacent shield tunnels construction beneath, a safety control plan has been proposed based on the shield tunnels constructed beneath a well-type underground pedestrian passage in Hohhot Subway. This plan involves the use of both numerical simulations and on-site monitoring to investigate the deformation patterns of the rectangular pipe jacking. The results suggest that the combined approach of interlayer soil grouting and steel support reinforcement is not only appropriate but also feasible for on-site implementation. It can be concluded that interlayer soil grouting for reinforcement was applied successfully to improve the strength of surrounding soils. Steel support reinforcement is advantageous for controlling the relative deformation between pipe segments. The maximum settlement induced by the shield tunneling for Passage A and Passage B was measured at 17.67 mm and 10.08 mm, respectively, with the final settlement distribution of the rectangular pipe jacking taking on a “W” shape. This study could provide a reference for the design and construction of shield tunnels that undercross existing rectangular pipe-jacking tunnels.

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Investigation on the engineering effects of the geometrical configuration of the jacking rectangular pipe

Cited by 18 publications

References 35 publications

A Segmented Calculation Method for Friction Force in Long-Distance Box Jacking Considering the Effect of Lubricant

A Segmented Calculation Method for Friction Force in Long-Distance Box Jacking Considering the Effect of Lubricant

Investigation on the Mechanical Characteristics of Excavation of Double-Line Highway Tunnel Underpass Existing Railway Tunnel under the Influence of Dynamic and Static Load

Effect of Undercrossing Shield Tunnels Excavation on Existing Rectangular Pipe-Jacking Tunnels

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