A new method for predicting the friction resistance in rectangular pipe-jacking

Ma, Peifeng; Shimada, Hideki; Sasaoka, Takashi; Hamanaka, Akihiro; Moses, Dyson; Dintwe, Tumelo K. M.; Matsumoto, Fumihiko; Ma, Baosong; Huang, Sheng

doi:10.1016/j.tust.2021.104338

Cited by 38 publications

(18 citation statements)

References 30 publications

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“…The cutterhead resistance is typically kept constant, and the slope of the jacking force curve can reflect the change in friction forces [10,14,15]. It was observed that the construction process includes three conditions: without lubrication, lubrication gradually coming into play, and lubrication fully in play, which should be divided into zones when calculating the friction force.…”

Section: Field Monitoring Resultsmentioning

confidence: 99%

“…The Terzaghi loose soil pressure theory considers the restraining effect of the soil column around the tunnel on the overlying soil mass, known as the soil arching effect. This concept has been adopted by circular jacking specifications in various countries [14,15].…”

Section: Earth Pressure Around the Boxmentioning

confidence: 99%

“…Wen et al [13] calculated earth pressure based on the soil column model and the Protodyakonov model and established the calculation formula for friction resistance for five kinds of box-soil interaction models. Ma et al [14] and Zhang et al [15] proved that the assumption of partial box-soil contact is reasonable and proposed a calculation method for box-jacking friction forces by considering the soil arching effect.…”

Section: Introductionmentioning

confidence: 99%

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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: Field Monitoring Resultsmentioning

confidence: 99%

Section: Earth Pressure Around the Boxmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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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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“…The arching effect is typically less significant due to the limited depth. The tunnel arch effect is more pronounced in deeper tunnels where the overlying soil or rock has a greater capacity to redistribute stresses 15 – 18 . The calculation is segregated into two cases based on the depth of burial: no arching effect and arching effect.…”

Section: Calculation Of Rectangular Pipe Jacking Force Based On Pipe–...mentioning

confidence: 99%

Frictional resistance calculation and jacking force prediction of rectangular pipe jacking

Kong,

Guan,

et al. 2023

Sci Rep

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In practical engineering, whilst estimating the jacking force of rectangular pipe jacking using an empirical formula, the results obtained from said formula deviate from reality and manifest inadequate engineering guidance. The equations governing the applied force during the installation of rectangular pipe jacking have been derived for various contact states involving the interaction between the pipe, slurry, and soil. The distinct stress conditions in the pipe jacking process as well as the shear-friction mechanism between the pipe and the surrounding soil have been taken into account. The displacement control method is introduced to simulate the pipe–slurry–soil contact friction during the pipe jacking process in FLAC3D. Additionally, the pipe jacking behavior, pipe–slurry–soil contact frictional force, and variation law of the jacking force are also simulated. Mutual verification was carried out using the results obtained from field monitoring, numerical and theoretical. The findings are as follows: the established equations for calculating pipe jacking force are highly applicable across various conditions of pipe–slurry–soil contact, and the outcomes derived from theoretical formulas align remarkably well with those obtained through field monitoring and numerical simulation. During the jacking process, the sidewalls exhibit initial partial sliding followed by a complete movement as the jacking force intensifies and subsequently diminishes, eventually attaining stability during the behavior adjustment phase. Moreover, the bottom pipe–soil contact is the most common situation in actual construction.

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“…Ma proposed a new pipe-soil contact model for rectangular pipe-jacking for friction force prediction under the lubricant applied condition, and a numerical simulation was conducted using the finite element method to verify the proposed model [ 10 ]. Ye provided a new approach to predict the friction resistance of slurry pipe jacking, the influence of buried depth, overcut, and pipe diameter on the friction resistance and lubrication efficiency were analyzed [ 16 ].…”

Section: Introductionmentioning

confidence: 99%

Comparative research on the pipe-soil frictional resistances of circular and rectangular pipe sections during trenchless pipe jacking

Wen,

Zhang,

Xiang

2024

PLoS ONE

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Pipe jacking is a trenchless construction method to achieve forward tunneling and efficient construction of underground structure simultaneously without extensive surface excavation. In the process of pipe jacking construction, the jacking force provided by the hydraulic jacking equipment must overcome the frontal resistance of the cutter head and the frictional resistance between the pipe sections and formation at the same time. In particular, the pipe-soil frictional resistance increases with the increases of jacking distance, buried depth, pipe diameter and the complexity of jacking trajectory. Therefore, it is very important to correctly estimate jacking force in trenchless jacking engineering practice for the smooth implementation of pipe jacking, operation risk and comprehensive cost control. Firstly, the stress states of jacking circular and rectangular pipe sections in the soil are analyzed, and the key influencing factors of their pipe-soil frictional resistance are obtained respectively. Then, the pipe-soil frictional resistance of jacking the circular and rectangular pipe sections with the same external surface area in the dry sandy soil and coal granular layer are tested separately by using the self-developed multifunctional experimental apparatus during trenchless pipe jacking. The results show that the pipe-soil frictional resistances of jacking circular and rectangular pipe sections in the coal granular layer are always smaller than that in the sandy soil under the same experimental conditions, and the corresponding fitting calculation equation of pipe-soil frictional resistances are obtained respectively. Meanwhile, the modified calculation methods of the above pipe-soil frictional resistances are proposed respectively based on the relationship between the lateral pressure coefficient K and the buried depth of pipe section H. Moreover, the disturbed area of soil in the upper part of jacking circular pipe section presents an arc distribution, while the disturbed area of soil in the upper part of jacking rectangular pipe section presents a slightly concave distribution. Due to the different disturbance conditions of soil around the pipe section, the lateral pressure coefficient K should be corrected in the calculation equations of pipe-soil frictional resistance of jacking circular and rectangular pipe sections based on the discrete element numerical simulation analysis by EDEM software. Finally, the pipe-soil frictional resistances obtained by different methods in the sandy soil are compared and analyzed. The calculated values of the modified theoretical calculation method are very close to the experimental test values, while the other methods are smaller than the experimental test values, which makes the rationality of the modified theoretical calculation method of pipe-soil frictional resistance is verified, and some suggestions are also put forward for the value of some coefficients in the relevant empirical estimation equations. The above research achievements systematically compared the states of pipe-soil frictional resistances of jacking circular and rectangular pipe sections based on different research methods, especially for the correct evaluation of jacking force during trenchless pipe jacking, they could provide some valuable references and effective guidance for the subsequent research, engineering practice and further development of trenchless pipe jacking technology.

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A new method for predicting the friction resistance in rectangular pipe-jacking

Cited by 38 publications

References 30 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

Frictional resistance calculation and jacking force prediction of rectangular pipe jacking

Comparative research on the pipe-soil frictional resistances of circular and rectangular pipe sections during trenchless pipe jacking

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