Mechanism and numerical analysis of cutting rock and soil by TBM cutting tools

Guohui, Li; Wang, Wenjin; Jing, Zhijuan; Zuo, Liang; Wang, Fubin; Wei, Zhen

doi:10.1016/j.tust.2018.08.015

Cited by 28 publications

(8 citation statements)

References 7 publications

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“…If the pressure increase is too high, intensified crack development is the consequence and the cuttings show damage by cracks. Also, rock fragmentation has a major influence on excavated aggregate characteristics [37,38]. The presence of schistosity or foliation favors the occurrence of stem-like or platy aggregate shapes [30].…”

Section: Excavation Via Tunnel Boring Machine (Tbm)mentioning

confidence: 99%

Rock Material Recycling in Tunnel Engineering

Voit¹,

Kuschel²

2020

Applied Sciences

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In the construction industry, especially in tunneling or large-scale earthworks projects, huge quantities of excavation material are generated as a by-product. Although at first glance such material is undesirable, in many cases this material, if suitably treated and processed, can be recycled and reused on the construction site and does not necessarily need to be removed and deposited as waste at a landfill. In the simplest case, the material can be used as filling material with the least demanding requirements with regard to rock quality. Material of better quality often can be recycled as aggregate and be used as a substitute for conventional mineral aggregates. This approach generates numerous benefits regarding the costs for material procurement, storage and transport. In addition, reduction in environmental impact and demand for landfill volume can be achieved. The challenge lies in the fact that excavation material is not a standard aggregate in terms of geometric, physical and chemical characteristics and is subject to quality deviations during tunnel driving, mainly depending on the varying geology and applied excavation method. Therefore, preliminary research and experimental testing as well as specific evaluation and continuous examination of the rock quality during tunnel driving is necessary as well as ongoing adjustment of the rock processing plant to finally accomplish a high-quality level of recycled aggregates. This article illustrates the material investigations and treatment processes for the specific example of the Brenner Base Tunnel, the longest underground railway line in the world that is currently under construction. There, material recycling has already been successfully implemented.Apart from this, numerous other recently completed and currently ongoing research projects deal within this research question. For example, [7,8] gave an overview about the main aspects of tunnel muck recycling and its properties and application opportunities. Ref. [9,10] demonstrated the impact of different excavation methods, particularly examining the impact of excavation by a tunnel boring machine in contrast to blasting. Ref. [11] showed the recycling of tunnel excavation material in earthworks following the premise of maximum resource saving. In other research projects, it could be shown that, if complying certain conditions, the use of excavation material as aggregate resource for the construction of roads [12,13], power plants and concrete dam constructions [14] is feasible. Ref. [15] again concentrated on rock classification and the reuse possibilities of rocks from weak formations.Moreover, the scientific approach concerning the usage of excavation material reaches from planning and decision processes by handling of excavation material [2] to the technological implementation [16], focusing on the technical developments in relation to material analysis and the realization of a raw material database to manage materials analysis, and also addresses legal considerations regarding the use of the recycled...

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Section: Excavation Via Tunnel Boring Machine (Tbm)mentioning

confidence: 99%

Rock Material Recycling in Tunnel Engineering

Voit¹,

Kuschel²

2020

Applied Sciences

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“…Liu et al adopted the extended DP model to simulate the rock-breaking process of cutters, disc cutters, and polycrystalline diamond compact (PDC) drill bits, and achieved good simulation results. Therefore, this paper employs the extended D-P plastic model to simulate the constitutive relationship of coal rock [20][21][22]. Figure 2 shows the yield surface used in the linear D-P model.…”

Section: Selection Of Constitutive Modelmentioning

confidence: 99%

Rock Breaking Performance of Two Disc Cutters of Tunnel Boring Machine for Safe Tunneling in Unstable Coal Rock Stratum

Guo¹,

Wang²,

Lv³

et al. 2020

IJSSE

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In unstable coal rock formations, the rescue channels should be constructed through safe and efficient tunneling. The rock breaking performance of the tunneling equipment directly hinges on the cutter-head layout. Focusing on the conditions of unstable coal rock formation, this paper adopts the extended Drucker-Prager (D-P) plastic model to define the properties of bedrock materials of the coal rock with low mechanical strength and poor homogeneity. Then, a finite-element model was established on ABAQUS for the coal rock cut by two disc cutters, and used to simulate the breaking of the coal rock and the peeling of slags from the bedrock. On this basis, the authors analyzed the influence of cutter spacing (30, 35, 40, and 45mm) over cutting force, rock breaking amount, and specific energy under two cutting methods: simultaneous cutting and sequential cutting. Finally, a cutter deployment strategy was designed for safe and efficient tunneling in unstable coal rock formations. The results show that: Under simultaneous cutting, as the cutter spacing increased from 30 to 35mm, the rock breaking amount increased, while the specific energy declined; as the cutter spacing further rose from 35 to 45mm, the rock breaking amount dropped, while the specific energy increased. Under the coal rock conditions in our research, the optimal cutter deployment strategy is: simultaneous cutting with cutter spacing of 35mm. The research results provide theoretical support for the cutter-head design of rescue equipment for collapsed coalmines.

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“…In terms of the rock-breaking mechanism of TBM cutters, Menezes et al [14] simulated the mechanical rock-breaking process on finite-element software LS-DYNA. Li et al [15] developed a finite-element model for the cutting process of rock and soil, and specified the way to analyze the cutter-rock interaction. Rostami and Chang et al [19] described the general method for the optimal design of the cutter-head, and provided several design patterns.…”

Section: Introductionmentioning

confidence: 99%

Rock-Breaking Performance of Cutters of Tunnel Boring Machine in Broken Coal Rock Formation

Guo¹,

Lv²,

Wang³

et al. 2020

IJSSE

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This paper aims to design a suitable method to analyze the relationship between the rockbreaking performance and tunneling performance of the cutters of tunnel boring machine (TBM). Considering the cutting discontinuity in broken coal rock formation, the authors put forward a simulation method for the rock-breaking performance of TBM cutters. The material properties of broken coal rock with low mechanical strength and poor uniformity were described by a linear elastic constitutive model and a Drucker-Prager plastic model. The variations in the cutting force with cutting depths (5, 10 and 15mm) and rake angles (5, 10 and 15°) were observed through the simulations, aiming to disclose the mechanical nature of the contact, extrusion and peeling of the coal rock under the action of the cutter. The results show that a high cutting depth and a small rake angle are favorable for tunneling efficiency, but unfavorable for tunneling safety. Overall, the optimal cutting parameters were determined as the cutting depth of 10mm and rake angle of 15°. Our simulations were proved valid through comparison with the results of Evans' cutting resistance model for wedge cutters. The research results shed new light on the research into the TBM cutting of unstable coal rock.

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Mechanism and numerical analysis of cutting rock and soil by TBM cutting tools

Cited by 28 publications

References 7 publications

Rock Material Recycling in Tunnel Engineering

Rock Material Recycling in Tunnel Engineering

Rock Breaking Performance of Two Disc Cutters of Tunnel Boring Machine for Safe Tunneling in Unstable Coal Rock Stratum

Rock-Breaking Performance of Cutters of Tunnel Boring Machine in Broken Coal Rock Formation

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