Rock deformation equations and application to the study on slantingly installed disc cutter

Zhang, Zhaohuang; Meng, Liang; Sun, Fei

doi:10.1007/s10409-014-0056-3

Cited by 8 publications

(3 citation statements)

References 10 publications

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“…Haeri et al 11 have studied the linear elastic fractural mechanics of rock and maximum shear stress criterion and estimated the stress intensity factors of a single-disc cutter based on higher-order indirect boundary element methods. Zhang et al 12 analysed the forces on disc cutters of full-face rock TBM cutter plate. They built a model according to the actual rock breaking, proposing the principle of layout of hob on cutter plate and verifying this model with experiments.…”

Section: Introductionmentioning

confidence: 99%

Research on optimal layout of cutter-head system of rock tunnel-boring machine based on Archimedes spiral theory

Chen

Wei²,

Gong

2018

Advances in Mechanical Engineering

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In order to obtain the satisfied rock-breaking requirements, the layout of cutter-head system of tunnel-boring machine are optimized and analysed to work efficiently by the scientific and reasonable design. An integrated method which can optimize exactly the cutter-head system considering equivalent life principle and force balance based on Archimedes spiral theory is proposed in this article. The effect of installation radius of cutter on wear coefficient and tunnelling coefficient is analysed using equivalent life principle. The force balance models are established using optimization of cutter arrangement. The comparison between the simulation and experimental results shows that the kinematic and dynamic of cutter-head system are reasonable based on Archimedes spiral method. It can be concluded that, therefore, the proposed integration method can offer a theoretical foundation and reference for dynamic optimal design for cutter-head system.

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Section: Introductionmentioning

confidence: 99%

Research on optimal layout of cutter-head system of rock tunnel-boring machine based on Archimedes spiral theory

Chen

Wei²,

Gong

2018

Advances in Mechanical Engineering

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“…The following year, it was reported that disc cutters designed according to this theory had an apparent enhancement in their lifetime [14] and the specific energy required for fragmentation was lower [15,16]. Alteration of the angles of the disc cutters during fragmentation was found to be capable of reducing the force required for fragmentation [17].…”

Section: Introductionmentioning

confidence: 99%

Fragmentation Energy-Saving Theory of Full Face Rock Tunnel Boring Machine Disc Cutters

Zhang

Gong

Guo

et al. 2017

Chin. J. Mech. Eng.

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Attempts to minimize energy consumption of a tunnel boring machine disc cutter during the process of fragmentation have largely focused on optimizing disccutter spacing, as determined by the minimum specific energy required for fragmentation; however, indentation tests showed that rock deforms plastically beneath the cutters. Equations for thrust were developed for both the traditional, popularly employed disc cutter and anew design based on three-dimensional theory. The respective energy consumption for penetration, rolling, and side-slip fragmentations were obtained. A change in disc-cutter fragmentation angles resulted in a change in the nature of the interaction between the cutter and rock, which lowered the specific energy of fragmentation. During actual field excavations to the same penetration length, the combined energy consumption for fragmentation using the newly designed cutters was 15% lower than that when using the traditional design. This paper presents a theory for energy saving in tunnel boring machines. Investigation results showed that the disc cutters designed using this theory were more durable than traditional designs, and effectively lowered the energy consumption.

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“…Moon and Oh [19] used discrete element method analysis to simulate a multi-indentation to study the optimal rock-cutting phenomena in terms of the interaction of the spacing to penetration ratio with intact rock properties. These achievements were all based on the research with disc cutters traditionally installed, while after the long-term research we discovered the mechanics law of interaction between disc cutters installed slantingly outward and rocks [20,21], and hereafter we also found that the disc cutter installed slantingly can generate a better mechanical effect [22,23]. Thus, the rock-breaking model with disc cutters slantingly installed is developed for a further study of the rock fragmentation of disc cutters, a contrastive analysis of fragmentation effects of two models has been made: one is based on the slantingly installed disc cutters and the other traditionally installed disc cutters.…”

Section: Introductionmentioning

confidence: 99%

The comparative analysis of rocks’ resistance to forward-slanting disc cutters and traditionally installed disc cutters

2015

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At present, disc cutters of a full face rock tunnel boring machine are mostly mounted in the traditional way. Practical use in engineering projects reveals that this installation method not only heavily affects the operation life of disc cutters, but also increases the energy consumption of a full face rock tunnel boring machine. To straighten out this issue, therefore, a rock-breaking model is developed for disc cutters' movement after the research on the rock breaking of forward-slanting disc cutters. Equations of its displacement are established based on the analysis of velocity vector of a disc cutter's rock-breaking point. The functional relations then are brought forward between the displacement parameters of a rock-breaking point and its coordinate through the analysis of micro displacement of a rock-breaking point. Thus, the geometric equations of rock deformation are derived for the forward-slanting installation of disc cutters. With a linear relationship remaining between the acting force and its deformation either before or after the leap breaking, the constitutive relation of rock deformation can be expressed in the form of generalized Hooke law, hence the comparative analysis of the variation in the resistance of rock to the disc cutters mounted in the forward-slanting way with that in the traditional way. It is discovered that with the same penetration, strain of the rock in contact with forwardslanting disc cutters is apparently on the decline, in other words, the resistance of rock to disc cutters is reduced. Thus wear of disc cutters resulted from friction is lowered and energy consumption is correspondingly decreased. It will be useful for the development of installation and design theory of disc cutters, and significant for the breakthrough in the design of full face rock tunnel boring machine.

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Rock deformation equations and application to the study on slantingly installed disc cutter

Cited by 8 publications

References 10 publications

Research on optimal layout of cutter-head system of rock tunnel-boring machine based on Archimedes spiral theory

Research on optimal layout of cutter-head system of rock tunnel-boring machine based on Archimedes spiral theory

Fragmentation Energy-Saving Theory of Full Face Rock Tunnel Boring Machine Disc Cutters

The comparative analysis of rocks’ resistance to forward-slanting disc cutters and traditionally installed disc cutters

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