Analysis of jacking forces during pipe jacking in granular materials using particle methods

Ji, Xinbo; Ni, Pengpeng; Barla, Marco

doi:10.1016/j.undsp.2019.03.002

Cited by 25 publications

(9 citation statements)

References 31 publications

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“…Thus, in the practice of trenchless pipe jacking engineering, pipe-soil frictional resistance is the key factor to be considered when determining the jacking force of equipment. The reasonable estimation of jacking force directly determines the success or failure of trenchless pipe jacking operation, it also has great influence on the aspects of safety, resource allocation and comprehensive cost control during operation [1][2][3][4][5][10][11][12][13][14][15][16][17][18][19].…”

Section: Technical Principle Of Trenchless Pipe Jackingmentioning

confidence: 99%

“…Many pipe jacking engineering practices show that if the pipe-soil frictional resistance is too large, it may cause the engineering accidents such as jacking difficulty, pipe section cracking, the back support wall of launching shaft damage, etc. [1][2][3][4][5][6][7][8][9][10][11][12][13]21] Thus, there are two key aspects to ensure the smooth implementation of trenchless pipe jacking operation as follow: (1) How to accurately estimate the jacking force for the construction design of pipe jacking operation? Currently, the main estimation methods of jacking force include theoretical analysis, experimental test, theoretical calculation equations, empirical estimation equations, and field monitoring, etc.…”

Section: Introductionmentioning

confidence: 99%

“…Currently, the main estimation methods of jacking force include theoretical analysis, experimental test, theoretical calculation equations, empirical estimation equations, and field monitoring, etc. However, each estimation method has its own applicable conditions and limitations, it is difficult to provide a general guidance for pipe jacking engineering practice [1][2][3][4][5][10][11][12][13][14][15][16][17][18][19]. (2) How to effectively reduce the pipe-soil frictional resistance during pipe jacking process?…”

Section: Introductionmentioning

confidence: 99%

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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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Section: Technical Principle Of Trenchless Pipe Jackingmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

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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“…With global urbanization, the adoption of pipe jacking technology has become widespread in the creation of diverse urban infrastructures [1][2][3][4][5]. Compared with the conventional open-cut method, pipe jacking, which requires a much smaller job site area, could avoid utility diversions, mitigate the risks of damaging existing infrastructure, and reduce traffic disruptions [2][3][4]. Yet, the jacking distance, to a great extent, restricts the application of pipe jacking because of friction resistance [1].…”

Section: Introductionmentioning

confidence: 99%

“…When the jacking distance is increased, the jacking force keeps rising, and when the friction resistance increases, more jacking force is also required. As a result, excessive jacking force might damage the pipe segments, reaction walls, and adjoining buildings [1][2][3][4]. In the field of engineering, friction resistance is commonly mitigated using two prevalent strategies: the strategic placement of intermediate jacking stations within pipe segments at regular intervals, and the injection of lubricants into the annular gap that exists between the pipe strings and the rock-soil mass [5,6].…”

Section: Introductionmentioning

confidence: 99%

Development and Field Application of an Automated Pipe Jacking Friction Resistance Identification and Warning System in Construction

Jin,

Wu,

Zheng

et al. 2023

Applied Sciences

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Minimizing frictional resistance is crucial for ensuring the safety and smooth progress of pipe jacking construction. However, due to the unpredictability of geological conditions, it is difficult to grasp the frictional resistance during construction, which poses challenges to safe and smooth construction. In order to reduce the frictional resistance during the process of pipe jacking, an automated pipe jacking friction resistance identification and warning system is thus innovatively proposed. This system uses jacking resistance sensors to identify resistance during the jacking process. When the jacking resistance exceeds a certain threshold, the system will send alerts, which could prompt construction workers to adjust the rheological slurry ratio according to the on-site soil conditions. This system includes the following major components: (1) an analysis of primary factors influencing pipe frictional resistance and a model for resistance calculation, (2) the examination of forces exerted on disturbed soil during pipe jacking construction to determine the optimal placement of resistance sensors, (3) the design and operational principles for an automated resistance identification and warning system, and (4) the application of a slurry shield construction method for resistance reduction. The research has practical significance in providing a reference for developing intelligent pipe jacking and contributing to the improvement in construction safety levels.

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Laboratory investigation and constitutive modeling of the mechanical behavior of sand–GRP interfaces

2022

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Analysis of jacking forces during pipe jacking in granular materials using particle methods

Cited by 25 publications

References 31 publications

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

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

Development and Field Application of an Automated Pipe Jacking Friction Resistance Identification and Warning System in Construction

Laboratory investigation and constitutive modeling of the mechanical behavior of sand–GRP interfaces

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