Journal of Jilin University(Engineering and Technology Edition) ›› 2026, Vol. 56 ›› Issue (8): 2162-2176.doi: 10.13229/j.cnki.jdxbgxb.20250042

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Life prediction of TBM disc cutters considering dense core effect and compressionshear failure mode

Chao WANG(),Jin-feng ZOU(),Liang LI,Dan SHU   

  1. School of Civil Engineering,Central South University,Changsha 410075,China
  • Received:2025-01-12 Online:2026-08-01 Published:2026-09-02
  • Contact: Jin-feng ZOU E-mail:wangchao214801069@yeah.net;zoujinfeng_csu@163.com

Abstract:

In order to accurately predict the service life of the hob in the rock-breaking process of Tunnel Boring Machine(TBM) to improve the boring efficiency and determine the time of changing the hob, this study analyzed the rock-breaking mechanism of the disk hob and established the calculation model of the normal force of rock-breaking hob of TBM based on the shear and tensile failure mechanism. The Rabinowicz abrasive wear model was improved based on the dense core effect to establish the wear rate and life prediction model of TBM disc cutters considering dense core effect and compression-shear failure mode. The engineering applicability of the prediction model proposed in this study was verified by the comparing the prediction results with the existing theoretical model calculation results, numerical simulation results and on-site monitoring results. The results show that the predicted values of this model are closer to the measured values in the engineering field. Compared with the existing theoretical model, the average prediction accuracies of cutter wear rate and cutter life are improved by 9.1% and 11.7% respectively, which effectively demonstrates the necessity of comprehensively considering the dense core effect and compression-shear failure mode in the calculation of TBM cutters breaking rock. The cutter wear rate and life index can be used as reliable indexes for evaluating the cutter wear characteristics during the rock breaking process of TBM, which can provide theoretical guidance for the design and timing of cutters change program in TBM tunnel and other similar projects.

Key words: tunnel boring machine, rock-breaking, service life, disc cutter, dense core effect, compression-shear failure mode

CLC Number: 

  • U455

Fig.1

Rock breaking diagram of TBM disc cutter"

Fig.2

Micro element dφ mechanical analysis model of hob invading rock"

Fig.3

Schematic diagram of stress distribution in hob section"

Fig.4

Shear damage surface and strength envelope based on Mohr?Coulomb strength criterion"

Fig.5

Simplified schematic diagram of rock breakingmechanics of TBM cutter in rock shear failuremode"

Fig.6

Schematic diagram of TBM hob invading rock in rock compression failure mode"

Fig.7

Simplified model of Rabinowicz abrasive wear"

Fig.8

Improved simplified model of Rabinowicz abrasive wear based on dense core effect"

Table 1

Technical parameters of composite EPB shield machine"

参数数值参数数值
整机功率/kW1 726.22中心滚刀数量/把8
刀盘转速/(r·min-12.2正面滚刀数量/把31
扭矩/(kN·m)2 500边缘滚刀数量/把14
盾构推力/kN12 000滚刀直径/mm432
掘进速度/(mm·min-115刀刃宽度/mm17
刀盘开口率/%32滚刀刃角/(°)20
刀盘压力/MPa8.0刀圈硬度/HRC55
刀盘额定功率/kW945推进油缸总推进力/t4 086
最大贯入度 /mm≥10开挖直径/mm6 420

Fig.9

Distribution area division of rolling cutters"

Fig.10

Geological profile of shield tunnels in interval from Qingshanhu West Station to Shangshagou Station"

Table 2

Statistics of physical and mechanical parame- ters of rocks and soils in each stratum"

地层天然重度/(kN·m-3黏聚力/kPa内摩擦角/(°)压缩模量/MPa泊松比
素填土17.8218--
粉质黏土17.63526300.32
中砂18.2036420.22
砾砂22.5042560.18
微风化花岗岩26.518 30042.51000.25

Fig.11

Layout of holes required for tool wear monitoring"

Fig.12

Statistics of accumulated wear of roller cutters in 210~552 rings of right tunnel measured on site"

Fig.13

Structure and dimensions of TBM disc cutter"

Table 3

Cutter ring material of TBM disc hob"

材料模型密度/(kg·m-3弹性模量/GPa泊松比
线弹性模型7 5002100.3

Table 4

Statistical table of material parameters of rock sample model"

岩层

密度/

(kg·m-3

抗压

强度/

MPa

抗拉

强度/

MPa

弹性

模量/GPa

泊松比完整性系数Kv滚压系数Kn
微风化花岗岩2 650857.1522.50.250.520.65

Fig.14

Numerical model of TBM disc cutter breaking rock"

Fig.15

Wear rate variation curve of TBM disk cutters considering only compression-shear failure mode"

Fig.16

Wear rate variation curve of TBM disk cutters considering dense core effect and compression- shear failure mode"

Fig.17

Validation curve of disk cutter life prediction model for TBM rock breaking process consid-ering only compression-shear failure mode"

Fig.18

Validation curve of disk cutter life prediction model in TBM rock breaking process considering dense nucleation effect and compression-shear failure mode"

Fig.19

Statistics of variation of life prediction error of disk cutters during TBM breaking rock"

Fig.20

Wear rate variation curves of TBM disc cutters calculated by different models"

Fig.21

Service life variation curves of TBM disc cutters calculated by different models"

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