Full-scale granite cutting experiments using tunnel boring machine disc cutters at different free-face conditions

Xu, Hua‐Guo; Geng, Qi; Sun, ZhengMing; Zhichong, QI

doi:10.1016/j.tust.2020.103719

Cited by 32 publications

(9 citation statements)

References 34 publications

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“…The interlocking friction along irregular rock grain boundaries can be simulated by using the GDEM approach, and the fractures that follow the grain boundaries and traverse the grain body can be both simulated. This approach is becoming popular and has been applied by several researchers, proving its reasonability and effectiveness [17,28,[30][31]. The GDEM modeling process is shown in Fig.…”

Section: Project Overviewmentioning

confidence: 99%

“…On this basis, Xia et al [15] and Zhang et al [16] carried out full-scale linear cutting tests and simulations on hard granite to study the influence of free-face spacing on the rockbreaking performance. Xu et al [17] carried out full-scale rotary cutting tests on hard granite to study the critical threshold of free-face spacing. Wang et al [18] simulated the rock indentation process induced by TBM cutters under different free-face conditions using a grain-based DEM approach, and discovered that there exist two critical thresholds for the free-face height and spacing respectively.…”

Section: Introductionmentioning

confidence: 99%

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Investigation on the Rock-Fragmentation Process of Conical-Shaped TBM Cutterhead in Extremely Hard Rock Ground

Chen,

Jin,

et al. 2023

CEJ

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Conical-shaped cutterhead is one type of tunnel boring machine (TBM) cutterhead which may have advantage of high rock-breaking efficiency in extremely hard rock ground. This study investigated the rock-fragmentation process of disc cutters on the conical-shaped cutterhead via a series of numerical simulations that had been verified by laboratory rock-fragmentation tests. Firstly, the rock-fragmentation numerical model of the six cutters in the 'flat-cone' contiguous part was built based on cutting mode analysis of the conical-shape cutterhead. The rock sample in the numerical model was synthesized using a grain-based discrete element method (GB-DEM) and the reliability of this approach was verified via scaled rock-fragmentation tests conducted on a self-developed linear cutting machine (LCM). Then, a series of numerical simulations were conducted to study the influence of cutterhead cone angle, cutter spacing, and cutter installation angle on the rock-fragmentation performance. The results were as follows: 1) the nature of rock fragmentation in the cone area is the rock fragmentation under side free-face condition; 2) the penetration specific energy can be reduced and thus the rock-fragmentation efficiency can be improved by appropriately increasing the conical angle, reducing the cutter spacing, and increasing the cutter installation angle; 3) for the studied granite, the optimal conical angle is 25°, the cutter spacing is suggested to be no more than 70 mm, and the cutter tilt angle is suggested to be no more than 3°. The results obtained in this paper can be used as guidance for the design of the conical-shaped cutterhead.

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Section: Project Overviewmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Investigation on the Rock-Fragmentation Process of Conical-Shaped TBM Cutterhead in Extremely Hard Rock Ground

Chen,

Jin,

et al. 2023

CEJ

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“…[ 29 ] DEM, PFC 2D GBM method, cracks, stress, indentation force; free face conditions Xu et al . [ 30 ] …”

Section: Introductionmentioning

confidence: 99%

“…However, their simulation accuracy is usually restrained by the low rolling resistance between neighbouring spherical particles if the linear parallel bond contact model is directly assigned [ 31 ]. To solve this problem, some grain-based methods (GBM) [ 22 , 27 , 30 , 32 ] have been developed by grouping the particles into breakable clusters or unbreakable clumps according to the size and shape of the mineral grains; hence, the rock chipping behaviour and rock cutting forces can be accurately simulated.…”

Section: Introductionmentioning

confidence: 99%

“…Summary of the representative numerical studies on the rock fragmentation process induced by TBM cutters during the past two decades (FEM, finite-element method; DEM, discrete element method; SPH, smoothed particle hydrodynamics; VE-NMM, Voronoi element-based numerical manifold method). method and software main concerns, and the studied parameters resources GBM method, cracks, stress, indentation force; free face conditions Xu et al [30] royalsocietypublishing.org/journal/rsos R. Soc. Open Sci.…”

Section: Introductionmentioning

confidence: 99%

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Geometry evolution of mesoscopic mechanical structures during the rock fragmentation process induced by tunnel boring machine (TBM) cutters

Geng

et al. 2022

R. Soc. open sci.

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We investigated the geometric evolution of mesoscopic mechanical structures in rocks during the rock fragmentation process induced by tunnel boring machine cutters. Numerical models were built using a grain-based discrete element method to accurately represent the mesoscopic structures and macroscopic mechanical behaviours of rocks, and the relationship between the mesoscopic evolution and the macroscopic response of rock was determined. The major results are as follows. First, the crushing and re-compaction of the grains were found to mainly occur in the thin crushed zone immediately beneath the cutter tip. Second, the reduction in the bearing ability of the dense core during cutter indentation was due to the order increment of the contact topological structure at the mesoscopic scale. Third, the area percentages of low- and high-order meso-loops decreased and increased, respectively, during the indentation process, and the volume expansion of the dense core was mainly caused by an increase in the internal pore area of high-order meso-loops that have low internal solid fractions. Fourth, the low-order meso-loops primarily bore and transferred the indentation force. Finally, the distribution contour of the meso-loops was found to be an appropriate and intuitive approach for representing the evolution of cracks on a macroscopic scale.

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Tunnel Boring Machine (TBM) Cutter Spacing Design Based on Simulations of Rock Breaking Process Using a FEM-SPH Coupling Method

Geng

Shi

Liu

et al. 2022

Mechanisms and Machine Science

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Full-scale granite cutting experiments using tunnel boring machine disc cutters at different free-face conditions

Cited by 32 publications

References 34 publications

Investigation on the Rock-Fragmentation Process of Conical-Shaped TBM Cutterhead in Extremely Hard Rock Ground

Investigation on the Rock-Fragmentation Process of Conical-Shaped TBM Cutterhead in Extremely Hard Rock Ground

Geometry evolution of mesoscopic mechanical structures during the rock fragmentation process induced by tunnel boring machine (TBM) cutters

Tunnel Boring Machine (TBM) Cutter Spacing Design Based on Simulations of Rock Breaking Process Using a FEM-SPH Coupling Method

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