Investigation of the tool-rock interaction using Drucker-Prager failure criterion

Liu, Weiji; Qian, Xudong; Tao, Li; Zhou, Yunlai; Zhu, Xiaohua

doi:10.1016/j.petrol.2018.09.064

Cited by 72 publications

(19 citation statements)

References 26 publications

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“…Cracks will appear first on the weak positions on the sides of the blade. Under the continuous action of the vertical cutter force, the SCAs under the two blades will interact with each other; the cracks on both sides of each blade will continue to develop, and converge at the middle of the two adjacent disc cutters [20].…”

Section: Rock Breaking Principle Of Two Disc Cuttersmentioning

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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Section: Rock Breaking Principle Of Two Disc Cuttersmentioning

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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“…erefore, various researches in fields such as cutting, indentation, and demolition have been conducted with increasing interest and necessity for cutting and breaking of rock and concrete [4][5][6]. On the contrary, waterjets using high-pressure water and abrasives are employed for the industrial cutting and cleaning of a variety of materials.…”

Section: Introductionmentioning

confidence: 99%

Effects of Focus Geometry on the Hard Rock‐Cutting Performance of an Abrasive Waterjet

Cha

Cho

2020

Advances in Civil Engineering

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Abrasive waterjets are being increasingly used in civil engineering for rock and concrete cutting, particularly for the demolition or repair of old structures. The energy of an abrasive waterjet is primarily provided by the accelerated abrasive. The momentum transfer during mixing and acceleration determines the abrasive velocity, which affects the cutting performance. Meanwhile, the geometry of the focus at which mixing occurs influences the momentum transfer efficiency. In this study, the effects of the focus geometry on the optimum abrasive flow rate (AFR) and momentum transfer characteristics in hard rock cutting were investigated. Experiments were conducted using granite specimens to test the AFR under different focus geometry conditions such as diameter and length. The results show that the focus geometry significantly affects the maximum cutting depth and optimum AFR. The maximum cutting energy was analyzed based on the cutting efficiency of a single abrasive particle. In addition, the momentum transfer parameter (MTP) was evaluated from the empirical relationship between the maximum energy and the cutting depth for granitic rocks. Accordingly, a model for estimating the MTP based on the AFR was developed. It is expected that the results of this study can be employed for the optimization of waterjet rock cutting.

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“…In terms of rock models, Liu et al [11] successfully conducted finite-element analyses on the generation and expansion of rock indentations and cracks under the action of cutters, in the light of the Drucker-Prager yield criterion. Qiao et al [12] created a reasonable coal rock constitutive model based on empirical formulas and previous experiments, and numerically simulated the coal rock cutting with conical picks.…”

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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Investigation of the tool-rock interaction using Drucker-Prager failure criterion

Cited by 72 publications

References 26 publications

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

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

Effects of Focus Geometry on the Hard Rock‐Cutting Performance of an Abrasive Waterjet

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

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