Numerical and experimental investigation of rock breaking method under free surface by TBM disc cutter

Zhang, Xuhui; Xia, Yimin; Zeng, Guiying; Tan, Qing; Guo, Bao

doi:10.1007/s11771-018-3900-y

Cited by 22 publications

(8 citation statements)

References 24 publications

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“…FM defined in this paper includes two equivalent ways of implementation (Figures 1(a) and 1(b)), where the crack propagation depth L in Figure 1(b) satisfies L < L m . At the FM state, the rock on the free face side is broken, exhibiting the following phenomena and characteristics [11,12]:…”

Section: Analysis Of the Phenomenon And Mechanismmentioning

confidence: 99%

“…From the rock breaking phenomenon and crack propagation rules of FM, the FM fracture surface is considered to be resembling a plane, and the surface morphology and geometric characteristics of the fracture surface are relatively regular and uniform, creating a large proportion of rock tensile failure [12,13]. Consequently, a tensile-shear failure hypothesis is proposed, which explains the failure mechanism of FM as the following.…”

Section: Analysis Of the Rock Breaking Mechanisms Of Fmmentioning

confidence: 99%

“…Under FM conditions, cracks under the cutter propagate to the free face and form an inclined fracture surface with a certain angle [12]. Based on the analysis models in Figures 4 and 5, both the normal force and side force are considered necessary to create fracture surfaces with different inclination angles, and ψ values also differ in the tension-shear fracture mode.…”

Section: Model Verification Of Crushing Anglementioning

confidence: 99%

“…Qi et al proposed a two-stage cutterhead scheme and proved that their apparatus required less thrust than conventional flat cutterheads in given geological and penetration conditions [9,10]. Subsequently, Xuhui et al [11,12] conducted a series of tests and simulations on free-face-assisted rock cutting (FM) on a linear cutting machine (LCM) and found that FM could effectively reduce disc cutting force and achieve large volume rock fragmentation with a higher rock breaking efficiency than conventional rock cutting methods (CM).…”

Section: Introductionmentioning

confidence: 99%

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A Study on the Mechanisms of Tension‐Shear Failure and the Estimation Model for Key Parameters of Free‐Face‐Assisted Rock Breaking

Tang

2021

Advances in Civil Engineering

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One huge challenge TBM construction face is to improve the breaking ability of cutters for hard rocks, making the studies on new rock breaking approaches for cutters very important. Although a lot of previous tests have proved that it is feasible to reduce the cutter force by free-face-assisted rock breaking (FM), the mechanisms behind such feasibility and the estimation methods for key parameters involved, including the maximum free face distance, crushing angle, and cutting force, remain to be studied further, limiting its applications in cutterhead design and engineering construction practice. Based on the analysis of the phenomena and laws of FM tests, this paper proposes the tensile-shear failure mechanism of FM and a piecewise linear failure criterion, which could explain the reason for the reduction of cutting force. Subsequently, a series of estimation models for the parameters above are proposed, and a series of FM tests were performed. By comparing the data obtained from the tests and calculations of the estimation model and CSM model, the estimation model in this paper is verified for its feasibility and limitations, which offered some insights on these aspects in follow-up research.

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Section: Analysis Of the Phenomenon And Mechanismmentioning

confidence: 99%

Section: Analysis Of the Rock Breaking Mechanisms Of Fmmentioning

confidence: 99%

Section: Model Verification Of Crushing Anglementioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

A Study on the Mechanisms of Tension‐Shear Failure and the Estimation Model for Key Parameters of Free‐Face‐Assisted Rock Breaking

Tang

2021

Advances in Civil Engineering

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“…The influence of Cattaneo-Christov double diffusion in a viscoelastic nanofluid flow has been discussed by Hayat et al [5]. Recently, some of the researchers [6][7][8][9][10][11][12] investigated the viscoelastic nanofluid flow induced due to a sheet stretching.…”

Section: Introductionmentioning

confidence: 99%

Joule Heating and Dissipation Effects on Magnetohydrodynamic Couple Stress Nanofluid Flow over a Bidirectional Stretching Surface

Tarakaramu¹,

Narayana²,

Babu³

et al. 2021

IJHT

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This work examines the effects of non-linear thermal radiation and Joule heating on MHD three-dimensional visco-elastic nanofluid flow due to a surface stretching in lateral directions. A coupled nonlinear differential system is generated from the boundary layer equations by using self-similarity variables and is then solved numerically by using most powerful shooting technique with Runge Kutta method of fourth order. The computational results for the flow variables are plotted graphically and are discussed in detail for various governing parameters that emerged in the analysis. It is observed that the momentum of the visco elastic nanofluid is better than that of a viscous fluid. Thicker thermal and concentration boundary layers are formed for increasing nonlinear thermal radiation and temperature ratio parameters. Also the results are in very good agreement with the outcomes available in the literature as a particular case. This model may play a significant role in the field of manufacturing and engineering applications.

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Evaluation of the effect of TBM disc cutter wear on rock cutting efficiency

Sabri,

Goshtasbi,

Reza Nejati

et al. 2024

Geomechanics and Tunnelling

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The geometry of the disc cutter is one of the most important factors in the rock cutting process of mechanized tunnel boring machines (TBMs). However, during excavation, the optimal conditions of the disc cutter are not constant due to disc cutter wear. One of the most significant consequences of cutter wear is the increase in the contact area of the disc cutter with the rock so when the wear of the cutter exceeds its maximum limits, it should be replaced. Therefore, this study will examine the effect of disc cutter wear on TBM operational parameters such as thrust force, net penetration rate, and specific energy. In order to achieve this, six types of worn 17“ disc cutters have been studied graphically, and a method for calculating the surface of contact between the disc cutter and rock as a function of the cutter tip width has been developed. Moreover, a new equation has been proposed to predict normal and rolling cutting forces whose results are in good agreement with the reported laboratory values. As a final step, the hard rock TBM parameters of the Kani Sib water conveyance tunnel have been studied after replacement of worn disc cutters. The results show that replacing the worn disc cutters leads to an increase in penetration rate and a decrease in thrust force, resulting in an increase in specific penetration. On average, specific penetration increases by ≈35 %.

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Numerical and experimental investigation of rock breaking method under free surface by TBM disc cutter

Cited by 22 publications

References 24 publications

A Study on the Mechanisms of Tension‐Shear Failure and the Estimation Model for Key Parameters of Free‐Face‐Assisted Rock Breaking

A Study on the Mechanisms of Tension‐Shear Failure and the Estimation Model for Key Parameters of Free‐Face‐Assisted Rock Breaking

Joule Heating and Dissipation Effects on Magnetohydrodynamic Couple Stress Nanofluid Flow over a Bidirectional Stretching Surface

Evaluation of the effect of TBM disc cutter wear on rock cutting efficiency

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