A jacking force study based on interpretation of box jacking records: A case study of curved rectangular box jacking in soft soil in Saitama, Japan

Yu, Bosong; Shimada, Hideki; Sasaoka, Takashi; Hamanaka, Akihiro; Matsumoto, Fumihiko; Morita, Tomo

doi:10.1016/j.tust.2023.105228

Cited by 8 publications

(2 citation statements)

References 43 publications

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“…In practical engineering, the friction coefficient (µ) is related to soil type and lubricant properties, making it challenging to accurately evaluate using the mentioned methods. Therefore, conducting contact shear tests for box-soil-lubricant interactions is a more feasible method for obtaining the friction coefficient [21,22]. In this study, shear friction tests on box-soil interactions were conducted, measuring the friction coefficient under different lubrication conditions and soil particle sizes.…”

Section: Box-soil Friction Coefficientmentioning

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: Box-soil Friction Coefficientmentioning

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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“…Some scholars have also carried out some research on the response of rectangular pipe-jacking tunnels. Based on the analysis of tunnel parameters, Yu et al [4] proposed a better method to predict the jacking force of pipe-jacking technology in long-distance driving. Zhang et al [5] proposed a calculation method for determining vertical earth pressure and frictional resistance of rectangular pipe jacking by establishing a box soil-lubricant contact 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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Mathematical modelling for strata deformation caused by rectangular pipe jacking construction in composite layered ground

Zhang,

Li,

et al. 2024

Applied Mathematical Modelling

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A jacking force study based on interpretation of box jacking records: A case study of curved rectangular box jacking in soft soil in Saitama, Japan

Cited by 8 publications

References 43 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

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

Mathematical modelling for strata deformation caused by rectangular pipe jacking construction in composite layered ground

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