Performance prediction of TBM disc cutting on granitic rock by the linear cutting test

Chang, Soo-Ho; Choi, Soon-Wook; Bae, Gyu-Jin; Jeon, Seokwon

doi:10.1016/j.tust.2005.12.131

Cited by 73 publications

(27 citation statements)

References 1 publication

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“…The radius of the disc cutter in the numerical models is 0.2 m, which is similar to the actual size of the disc cutter in a LCM test (Chang et al, 2006). The advancing speed of the disc cutter has been reported to have little effect on the cutting force (Chang et al, 2006); consequently, the advancing speed and the rotating angular speed of the disc cutter are set at 2.0 m/sec and 10 rad/ sec, respectively.…”

Section: Model Geometry and Input Datamentioning

confidence: 84%

“…The advancing speed of the disc cutter has been reported to have little effect on the cutting force (Chang et al, 2006); consequently, the advancing speed and the rotating angular speed of the disc cutter are set at 2.0 m/sec and 10 rad/ sec, respectively. The penetration depth of the disc cutter into the rock samples is set at 0.004 m, and the lower boundary is regarded as a fixed displacement boundary to restrict the motion of the rock sample during the cutting simulations.…”

Section: Model Geometry and Input Datamentioning

confidence: 99%

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Numerical study to estimate the cutting power on a disc cutter in jointed rock mass

Choi

Lee

2015

KSCE J Civ Eng

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The Linear Cutting Machine (LCM) test is known to be a reliable method for designing disc cutters by estimating the penetration performance of a Tunnel Boring Machine (TBM). The LCM test is a laboratory test that uses large-scale rock blocks to estimate the real-scale load on disc cutter; the LCM test offers many advantages, but the costs of preparing the rock samples and performing the laboratory test are too high. In addition, the test results from jointed rock blocks are rarely trustworthy because of the difficulty of performing the LCM test with this type of rock sample. To compensate for the failings of the laboratory test, many studies have been conducted to develop a suitable numerical model. However, few studies have investigated the mechanism of rock fragmentation as a function of the joint spacing and the joint direction. This paper presents the results of a Discrete Element Analysis (DEA) of the cutting power exerted on a TBM disc cutter at various joint dip angles, dip directions and spacings. The results show that the cutting power must be increased when the disc cutter advances in a direction opposite to the joint dip. The numerical analysis also shows that the cutting power of a disc cutter increases as the joint dip angle decreases and the joint spacing decreases. Comparing the relationship between the cutting power of the disc cutter and the distribution pattern of the rock joints with the LCM test results can be used to increase the reliability of TBM performance predictions.

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Section: Model Geometry and Input Datamentioning

confidence: 84%

Section: Model Geometry and Input Datamentioning

confidence: 99%

Numerical study to estimate the cutting power on a disc cutter in jointed rock mass

Choi

Lee

2015

KSCE J Civ Eng

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“…The wear resulting from friction energy consumption is the main cause of disc cutter failure (Nakayama, 1965;Chang et al, 2006). The method for determining the prediction model in this paper is to use friction energy to estimate the disc cutter wear.…”

Section: Prediction Model Of Disc Cutter Failurementioning

confidence: 99%

Prediction Model for TBM Disc Cutter Wear in Mixed-face Ground Condition

Ren¹,

Shen²,

Yuan³

et al. 2017

dtmse

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ABSTRACT:The disc cutter failures during shield machine tunnelling in mixed-face ground were summarised by classifying the wear data gathered from the construction of Guangzhou Metro Line 7. The stress state of disc cutter and different effective factors in mixed-face ground condition were analysed. A prediction model for disc cutter wear in mixed-face ground was proposed taking the working status of TBM and the characteristics of geological conditions into consideration. The TBM parameters and geological characteristics of the north tunnel in Guangzhou Metro Line 7 was used to determine the prediction model. With the prediction model, the disc cutter wear of the south tunnel was predicted. The effectiveness of the prediction model was verified by comparing the predicted value and the actual value of the south tunnel.

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“…In general, cutting tool size can be on the order of 10 -40cm (e.g. Chang et al 2006, Xue et al 2009) and is specified based upon the diameter of the TBM, TBM type, and the ground conditions (soil type and overburden pressure). This paper will assume large cutting tools with a size of 40cm in order to determine their maximum influence.…”

Section: Tbm Tunneling Environment and The Interface Regionmentioning

confidence: 99%

Examining the influence of TBM-ground interaction on electrical resistivity imaging ahead of the TBM

Schaeffer

Mooney

2016

Tunnelling and Underground Space Technology

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Tunnel excavation by means of tunnel boring machines (TBMs) is susceptible to unknown changes ahead of the tunnel face. Geophysics offers a technique called electrical resistivity that can continuously, in real-time, spatially map the formation in front of the TBM. Electrical resistivity has been successfully established for many applications including vadoze zone hydrology, oil/gas location, mineral location and failure detection in geo-structures. Yet it has not been well-established for TBM excavations. This is in part due to the complexity of the TBM tunneling environment and the uncertain influence this environment may have on the success of TBM-integrated-electrical resistivity to predict changes ahead of the tunnel face. One significant uncertainty lies in the interface region that exists around the TBM created during the modification of the virgin formation by a mechanical mixing action of the rotating cutterhead and the injection of additives used to aid in the extraction of the muck and protect the cutting tools from frictional wear. In this study, we investigate the influence of this interface region on TBM-integrated-electrical resistivity for both hard rock and soft ground tunneling conditions through finite element modeling. Regarding the performance of TBM-integrated-electrical resistivity to detect changes ahead of the cutting face, the interface region holds significant influence for both earth pressure balance (EPB) and open mode tunneling conditions. Electrical resistivity for slurry based tunneling is not influenced by the interface region. Simulations suggest that TBM-integrated-electrical resistivity can be sensitive to a formation change that is located up to five diameters in front of the TBM.

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Performance prediction of TBM disc cutting on granitic rock by the linear cutting test

Cited by 73 publications

References 1 publication

Numerical study to estimate the cutting power on a disc cutter in jointed rock mass

Numerical study to estimate the cutting power on a disc cutter in jointed rock mass

Prediction Model for TBM Disc Cutter Wear in Mixed-face Ground Condition

Examining the influence of TBM-ground interaction on electrical resistivity imaging ahead of the TBM

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