Performance analysis of utility tunneling data: A case study of pipe jacking in hard rock in Brittany, France

Lehmann, Gabriel; Käsling, Heiko; Cambier, Alexandre; Praetorius, Steffen; Thuro, Kurosch

doi:10.1016/j.tust.2022.104574

Cited by 9 publications

(4 citation statements)

References 16 publications

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“…Smaller disc cutters are used for microtunneling projects in which microtunnel-boring machines (MTBMs) are equipped with cutter head diameters of up to about 4 m. Disc cutters with diameters of 203.2 mm (8 ′′ ) to 355.6 mm (14 ′′ ) are usually used for such projects [25,26]. These smaller disc cutters are suitable for minor tunneling projects, such as various utility tunnels using trenchless pipe-jacking technology in rock and soil.…”

Section: Disc Cutter Sizes and Applicationsmentioning

confidence: 99%

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Investigation of Disc Cutter Wear in Tunnel-Boring Machines (TBMs): Integration of Photogrammetry, Measurement with a Caliper, Weighing, and Macroscopic Visual Inspection

Janc,

Vižintin,

Pal

2024

Applied Sciences

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During the construction of tunnels using tunnel-boring machines (TBMs), the wear of disc cutters is an unavoidable process. The timely replacement of worn disc cutters can have a positive effect on construction time and therefore on costs. The wear of disc cutters can be assessed using various measurement methods. The aim of this article is to show different methods of measuring and evaluating the wear of disc cutters and to present their main advantages and disadvantages. In this study, four different wear-measuring methods were used and applied to a worn double disc cutter: a macroscopic visual inspection, profile measurement with a caliper, weighing, and close-range photogrammetry. The results of the measurements showed that the worn disc cutter was subject to normal abrasive wear, with local steel chipping occurring. Based on the close-range photogrammetry measurements, a profile of the worn disc cutter was also created and compared with the original profile. It was found that the best results for the wear assessment of a disc cutter can be achieved by using several measurement methods simultaneously. The integration of different measurement and evaluation methods is therefore recommended for a comprehensive understanding of disc cutter wear.

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Section: Disc Cutter Sizes and Applicationsmentioning

confidence: 99%

“…The wear of the cutter ring profile is usually measured physically using a special measuring tool: a wear ruler. This allows the amount of profile wear to be measured directly and in millimeters [18,26,36,38]. Wear rulers differ depending on the geometry of the cutter ring profile.…”

Section: Disc Cutter Wearmentioning

confidence: 99%

Investigation of Disc Cutter Wear in Tunnel-Boring Machines (TBMs): Integration of Photogrammetry, Measurement with a Caliper, Weighing, and Macroscopic Visual Inspection

Janc,

Vižintin,

Pal

2024

Applied Sciences

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“…Deng et al [18] investigated the frictional resistance characteristics of pipe jacking in hard rock. Lehmann et al [19] analyzed the evolution of performance parameters of excavation machines in hard rock. Ma et al [20] analyzed the influence of pipe jacking diameter on stress and deformation using numerical methods.…”

Section: Introductionmentioning

confidence: 99%

Field monitoring and numerical simulation for force characteristics of pipe jacking in deep buried moderately weathered slate

Zheng,

Luo,

Wang

et al. 2024

Eng. Res. Express

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Understanding the force characteristics of pipe jacking in rock formations is crucial for ensuring the stability of the structure and construction safety during construction. Yet, very little is explored about its characteristics in rock formations of pipe jacking. This paper presents a case study of constructing a deeply buried moderately weathered slate sewage pipeline using pipe jacking method in Changsha, China. To this end, we propose a novel method to combine field monitoring and numerical simulation representation in an efficacious way. Field monitoring was conducted to investigate the spatial distribution characteristics of jacking force, axial stress, and hoop stress in moderately weathered slate. Numerical simulation methods were employed to discuss the influences of several factors on pipe stress: the pipe-rock contact area, contact relationships at pipe joint interfaces, the height of the jacking force position, and the depth of pipe burial. The results show that hand shield is influenced by the excavation technology, and the distribution of jacking force exhibits a stepped or oscillating upward pattern in moderately weathered slate. The maximum axial stress occurs at the mid-span position of the arched roof of pipe at 30 MPa. Hoop stresses are dominated by compressive stresses with the maximum at-8 MPa. As the pipe burial depth increases, so does the axial stress on the pipe. Lower positioning of the jacking force heightens this stress effect. A larger pipe-rock contact area correlates with reduced axial stress levels. The weakening of the contact interface between pipe joints minimally affects axial stress, as stress primarily transmits through non-weakened areas. To ensure the reliability of the data, automatic monitoring and measuring instruments calibrated for on-site monitoring are used. The results of this study can provide beneficial guidance for the design and construction of pipe jacking.

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“…It is shown that the surface deformation trough caused by a single tunnel fits well with the Peck curve, where the maximum deformation S max and the horizontal distance i to the inflection point define the shape of the curve [25,26], and the soil volume loss V s and the tunnel volume loss V t describe the magnitude of the ground motion (Figure 1 shows the details of the defined parameters S max , i, V t , and V s ). Due to the law of surface deformation caused by the pipe jacking construction method in soft soil areas [27], this paper adopts model experiments to investigate the influence of factors on the ground deformation during pipe jacking construction [28][29][30][31]. It also analyzes the size of ground deformation for specific engineering calculations of pipe jacking in soft soil areas, as well as the maximum ground deformation in soft soil areas and the overlying load [32,33].…”

Section: Introductionmentioning

confidence: 99%

Ground Surface Deformation Caused by Pipe Jacking Construction in a Soft Soil Area: An Experiment-Based Study

Tang

Zhou

et al. 2023

Buildings

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Soft soil has the characteristics of high compressibility, large void ratio, and strong structure. Therefore, it is more likely to cause surface subsidence or even surface cracking and collapse when laying oil and gas pipelines in soft soil areas through the pipe jacking method. In this study, test soil was pressurized using a flexible loading bladder, and variable formation losses brought on by pipe jacking were mimicked by varying the loading bladder’s water injection level. The surface deformation brought on by pipe jacking construction is related to the four parameters of stratum loss rate, overburden load, soil disturbance, soil tension fissures, and horizontal deformation. The findings demonstrate that the surface deformation brought on by the excavation gradually reduces and starts to stabilize after the thickness of the overlying soil layer on the pipe jacking surpasses 1.5 times the diameter of the pipe jacking. The constructed settling tank is broader the deeper the jacking pipe is submerged. Further ground surface settling will be exacerbated by the weight above the jacking pipe. The maximum ground surface deformation value will decrease with an increase in the overlying load when the overlying load is high (0.018 MPa).

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Performance analysis of utility tunneling data: A case study of pipe jacking in hard rock in Brittany, France

Cited by 9 publications

References 16 publications

Investigation of Disc Cutter Wear in Tunnel-Boring Machines (TBMs): Integration of Photogrammetry, Measurement with a Caliper, Weighing, and Macroscopic Visual Inspection

Investigation of Disc Cutter Wear in Tunnel-Boring Machines (TBMs): Integration of Photogrammetry, Measurement with a Caliper, Weighing, and Macroscopic Visual Inspection

Field monitoring and numerical simulation for force characteristics of pipe jacking in deep buried moderately weathered slate

Ground Surface Deformation Caused by Pipe Jacking Construction in a Soft Soil Area: An Experiment-Based Study

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