Evaluation of cutting efficiency during TBM disc cutter excavation within a Korean granitic rock using linear-cutting-machine testing and photogrammetric measurement

Cho, Jung-Woo; Jeon, Seokwon; Jeong, Hoyoung; Chang, Soo-Ho

doi:10.1016/j.tust.2012.08.006

Cited by 217 publications

(48 citation statements)

References 18 publications

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“…Cho et al (2013) used a Finite Element Method (FEM)-code with a strain-rate dependent constitutive law to simulate the excavation process of two adjacent cutters in 3D. Saksala (2013) recently published the results of a FEM-simulation that investigates the dynamic process of percussive drilling in 3D.…”

Section: Related Workmentioning

confidence: 99%

Rock Failure and Crack Propagation Beneath Disc Cutters

2014

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Analyses of rock failure mechanisms beneath disc cutters are presented. Full-scale cutting tests are conducted to assess the global energy input in comparison with rock chips and excavated volume. Small-scale cutting tests are subsequently used for macro-and microscopic analyses of rupture modes and crack propagation. A high spatial resolution allows to obtain pictures of crack networks in different rock types. It is shown that all specimens develop lateral cracks in sufficiently confined areas whereas median cracks typically develop in boundary regions. Regarding cutting forces, a hypothesis is proposed that associates sudden force drops accompanied by sudden sound emission with grain crushing in the proximity of the cutter tip.

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Section: Related Workmentioning

confidence: 99%

Rock Failure and Crack Propagation Beneath Disc Cutters

2014

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“…In 2012, Moon, et al [7], through simulations and results obtained in real linear cutting machine (LCM) tests, revealed that the effective rock-cutting condition corresponding to the minimum specific energy could be estimated by an optimized ratio of disc spacing, s, to penetration depth, p (the s/p ratio), which, in turn, is linearly proportional to the square of the material brittleness, B 2 , and cutter tip width, t (i.e., s/p = cB 2 t, where c is a coefficient). In 2013, Cho, et al [8] studied the minimum specific energy required during TBM excavation in a Korean granitic rock using LCM testing and photogrammetric measurement and provided a three-dimensional (3D) digital comparison. In 2015, simulation by Hadi, et al [9] revealed that eroded disc cutters increased the specific energy requirement.…”

Section: Introductionmentioning

confidence: 99%

Fragmentation Energy-Saving Theory of Full Face Rock Tunnel Boring Machine Disc Cutters

Zhang

Gong

Guo

et al. 2017

Chin. J. Mech. Eng.

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Attempts to minimize energy consumption of a tunnel boring machine disc cutter during the process of fragmentation have largely focused on optimizing disccutter spacing, as determined by the minimum specific energy required for fragmentation; however, indentation tests showed that rock deforms plastically beneath the cutters. Equations for thrust were developed for both the traditional, popularly employed disc cutter and anew design based on three-dimensional theory. The respective energy consumption for penetration, rolling, and side-slip fragmentations were obtained. A change in disc-cutter fragmentation angles resulted in a change in the nature of the interaction between the cutter and rock, which lowered the specific energy of fragmentation. During actual field excavations to the same penetration length, the combined energy consumption for fragmentation using the newly designed cutters was 15% lower than that when using the traditional design. This paper presents a theory for energy saving in tunnel boring machines. Investigation results showed that the disc cutters designed using this theory were more durable than traditional designs, and effectively lowered the energy consumption.

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“…The key issue for TBM excavation is to match the rock properties and the operational parameters of the machine (Zhao, Gong, & Eisensten, 2007). The efficiency of rock excavation depends on the cutter geometry and the cutting pattern used (Cho, Jeon, Jeong, & Chang, 2013). Therefore, the prior task in meeting the challenges mentioned above is to estimate forces acting on the rock cutting tools during operational process.…”

Section: Introductionmentioning

confidence: 99%

Scale factors for conversion of forces on disc cutters for the main domestic and foreign methods

Zhabin¹,

Polyakov²,

Averin³

2017

Min. miner. depos.

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Purpose. Disc cutter is an important tool which is used in tunneling to destroy the rock during excavation as it directly influences rock-breaking efficiency, advance rate and economy of a project. Thus, it is of critical importance to have a reliable and accurate method for making predictions on cutting forces during rock destruction by disc cutters. Russian (including Soviet) research in the field is limited by studying small-diameter and/or wedge-shaped disc cutters which are not currently used. This paper is meant to coordinate domestic research by Baron and Glatman with the most widely used and fully accepted foreign theoretical and semi-empirical methods (by Roxborough and Phillips, Bilgin and Phillips, and Rostami and Ozdemir) that have proven accurate and reliable for TBM (tunnel boring machine) performance prediction.Methods. The analysis of methods includes a brief review, a series of numerical experiments, which were performed for disc cutters with diameters 160 and 483 mm, and a comparison with the use of graphs. Then by approximation of the data obtained in this way, we have derived formulas for converting values of cutting forces gained by foreign methods into the values suitable for the same conditions and the domestic method. Findings.The method by Baron and Glatman itself could not be used for TBM performance prediction and tunneling planning nowadays. The approach based on the scale factors could be used for correlating any of the represented methods. Scale factors depend on the depth of cut (DOC) for rolling forces or on DOC and disc cutter diameter for normal forces.Originality. The analysis has also shown that mutual arrangement of the graph lines for all figures remains unchanged. The invariance of the relative positioning and trends of the graph lines allowed to assume that it is possible to introduce scale factors which help to convert values from one method into the values of other methods. The scale factor, which enables to relate domestic method and the main foreign methods, is determined by consecutive division of the calculated values obtained via the method of Baron and Glatman by the values used in other considered methods. Practical implications.The results could be used in TBM designing and in tunneling projects.

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Evaluation of cutting efficiency during TBM disc cutter excavation within a Korean granitic rock using linear-cutting-machine testing and photogrammetric measurement

Cited by 217 publications

References 18 publications

Rock Failure and Crack Propagation Beneath Disc Cutters

Rock Failure and Crack Propagation Beneath Disc Cutters

Fragmentation Energy-Saving Theory of Full Face Rock Tunnel Boring Machine Disc Cutters

Scale factors for conversion of forces on disc cutters for the main domestic and foreign methods

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