Cutting force measurement and analyses of shell cutters on a mixshield tunnelling machine

Huang, Xing; Liu, Quangsheng; Chen, Lei; Pan, Yucong; Liu, Bin; Kang, Yongshui; Liu, Xuewei

doi:10.1016/j.tust.2018.08.052

Cited by 25 publications

(7 citation statements)

References 13 publications

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“…After coal extraction works started, the longwall face advanced forward, the coal roof collapsed, and fractures generated between the coal seam and the No.1 overlying drainage roadway, meaning the CBM could be extracted from the No.1 overlying drainage roadway. The overlying CBM drainage roadway lies on the roof of the coal seam with a length of 1500 m, and the geometry of the overlying drainage roadway is a circle with a diameter of 4.5 m. Taking the reduction of construction cost and the improvement of efficiency of roadway support works into account, the TBM-excavated roadway was supported by rock bolts instead of the segments that were typically used in TBM-excavated tunnels [22].…”

Section: Description Of Working Sitementioning

confidence: 99%

Supporting Design Optimization of Tunnel Boring Machines-Excavated Coal Mine Roadways: A Case Study in Zhangji, China

et al. 2020

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Tunnel Boring Machines (TBMs) are a cutting-edge excavating equipment, but are barely applied in underground coal mines. For TBM excavation projects involving the Zhangji coal mine, the surrounding rock properties, stress field, cross section geometry, as well as the excavation-induced stress path of TBM-excavated coal mine roadways are different from those of traditional tunnels or roadways. Consequently, traditional roadway supporting technologies and experiences cannot be relied on for this project. In order to research an appropriate supporting pattern for a TBM-excavated coal mine roadway, first of all, the constitutive model of roadway surrounding rocks was derived, and a rock failure criterion was proposed based on rock mechanical tests. Secondly, a three-dimension finite element model was established and computer simulations under three different supporting patterns were conducted. Stress redistribution, roadway convergence, and excavation damage zone ranges of surrounding rocks under three different support patterns were analyzed and an optimal support design of the TBM-excavated roadway was made based on simulation results. During roadway excavation, convergence gauge and rock bolt dynamometers were installed for monitoring roadway convergence and the axial forces of rock bolts. The in-situ monitoring results verified the validity of roadway supporting designs.

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Section: Description Of Working Sitementioning

confidence: 99%

Supporting Design Optimization of Tunnel Boring Machines-Excavated Coal Mine Roadways: A Case Study in Zhangji, China

et al. 2020

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“…According to analyzing the failure mechanism of the disc cutter, Lin [19] suggested to use new materials strengthened on the disc cutter to resist the rock wear. The wear rate of cutters has been monitored online to carry out the repair and maintenance of cutters and the cutter head in real time [20]. Although the above methods have achieved certain beneficial effects, the problems of the low digging efficiency and high disc cutter wear rate are still not solved.…”

Section: Introductionmentioning

confidence: 99%

Rock Breaking Performance of TBM Disc Cutter Assisted by High-Pressure Water Jet

Wang

Zhou

et al. 2020

Applied Sciences

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A high-pressure water jet can break rock efficiently, which is of great potential to overcome the problems of a tunnel boring machine (TBM) in full-face hard rock tunnel digging, such as low digging efficiency and high disc cutter wear rate. Therefore, this paper presented a new tunneling method that is a TBM coupled with a high-pressure water jet. The rock failure mechanism under the coupled forces of a disc cutter and water jet was analyzed at first. Then, the finite element method (FEM) and smoothed particle hydrodynamics (SPH) method were used to establish a numerical model of rock broken by the disc cutter and water jet. Effects of parameters on rock breaking performance were studied based on the numerical model. Moreover, an experiment of the water jet cutting marble was carried out to verify the reliability of the numerical simulation. Results showed that the high-pressure water jet can increase the TBM digging efficiency and decrease the forces and wear rate of the disc cutter. The optimum nozzle diameter is 1.5 mm, while the optimum jet velocity is 224.5 m/s in this simulation. The results can provide theoretical guidance and data support for designing the most efficient system of a TBM with a water jet for digging a full-face hard rock tunnel.

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“…7 Moreover, an online measurement method was proposed to estimate the cutting force of the TBM cutter. 8,9 Zhang et al 10 established an excavation torque model of the TBM cutter head in mixed-face conditions. Liu et al 11 designed a load prediction model for the TBM cutter head to tackle the complex relationship among cutter parameters, operating parameters, and geological parameters.…”

Section: Introductionmentioning

confidence: 99%

“…7 Moreover, an online measurement method was proposed to estimate the cutting force of the TBM cutter. 8,9 Zhang et al. 10 established an excavation torque model of the TBM cutter head in mixed-face conditions.…”

Section: Introductionmentioning

confidence: 99%

Optimal control of a novel cutter head driving system for tunnel boring machine

Sun

Gong

Yang

et al. 2020

Proceedings of the Institution of Mechanical Engineers, Part K:

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The cutter head of a tunnel boring machine may be trapped in extremely adverse geological environments, which requires a large enough driving torque to get rid of the trapped condition. In this paper, a novel driving scheme is proposed to improve the driving performance of the tunnel boring machine cutter head without increasing the installation power. First, the hydro-viscous clutch is introduced to achieve the soft start of the cutter head by the flexible effect of viscous oil film. Then, the flywheel is employed as the energy storage element to provide sufficient torque during the hydro-viscous clutch engagement, which assists the cutter head to get rid of the trapped condition. Moreover, an optimal state feedback control law based on a linear quadratic regulator is designed by compromising system impact and hydro-viscous clutch friction loss to optimize the hydro-viscous clutch engagement process and achieve favorable driving performance of the cutter head. Finally, numerical simulations are conducted to validate the effectiveness of the proposed driving technology.

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Cutting force measurement and analyses of shell cutters on a mixshield tunnelling machine

Cited by 25 publications

References 13 publications

Supporting Design Optimization of Tunnel Boring Machines-Excavated Coal Mine Roadways: A Case Study in Zhangji, China

Supporting Design Optimization of Tunnel Boring Machines-Excavated Coal Mine Roadways: A Case Study in Zhangji, China

Rock Breaking Performance of TBM Disc Cutter Assisted by High-Pressure Water Jet

Optimal control of a novel cutter head driving system for tunnel boring machine

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