Comparative Study of the Rock-breaking Mechanism of a Disc Cutter and Wedge Tooth Cutter by Discrete Element Modelling

Hua, Jiang; Zhao, Hongwei; Zhang, Xiaoyan; Jiang, Yu-sheng; Zheng, Yaofu

doi:10.1186/s10033-023-00888-4

Cited by 5 publications

(2 citation statements)

References 32 publications

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“…Under the action of high ground stress, the coal sample is more sensitive to gas pressure, and only a small change in gas pressure will lead to outburst. This is consistent with previous conclusions 55 .…”

Section: Evolution Characteristics Analysis Of Impact Forcesupporting

confidence: 94%

Macroscopic fracture mechanism of coal body and evolution characteristics analysis of impact force in deep coal and gas outburst

Ren,

Tang,

Pan

et al. 2023

Sci Rep

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With the increase of mining depth and intensity, coal and gas outburst dynamic disasters occur frequently. In order to deeply study the macroscopic fracture mechanism of coal body and evolution characteristics analysis of impact force, taking the outburst coal seam of Pingmei No. 11 Coal Mine and Sunjiawan coal seam of Hengda Coal Mine as the research objects, the simulation roadway test system of self-developed true triaxial coal and gas outburst is applied to carry out the simulation test of deep coal and gas outburst with buried depths of 1000 m, 1200 m, 1400 m and 1600 m. During the test, the overlying strata stress is simulated by axial compression, the surrounding rock stress is simulated by confining pressure, the gas pressure is simulated by pore pressure, the impact force and acoustic emission monitoring technology are introduced, and the coal seam gas pressure is simulated by mixture pressure of 45% CO2 and 55% N2. From the viewpoint of fracture mechanics, the crack propagation mechanism of coal in the outburst launching area is discussed, the evolution characteristics of impact force and gas pressure are analyzed, and the influence law between acoustic emission signal and impact force is revealed. From the viewpoint of energy conversion, the transformation character of gas internal energy to impact kinetic energy (gas pressure to impact force) are analyzed. The results show that the generation of I-type crack is a prerequisite for outburst catastrophe. With the crack propagation, I-type and II-type cracks intersect and penetrate, resulting in internal structural damage and skeleton instability of coal. Gas wrapped fragmentized coal body thrown, outburst occurs. There is obvious negative pressure in the roadway after outburst. The occurrence of negative pressure is greatly affected by the physical and mechanical properties of coal, ground stress and gas pressure. Impact kinetic energy is mainly provided by gas internal energy. Part of the gas pressure is converted into impact force. The strength and duration of the impact force are determined by the gas pressure. Under the condition of deep working conditions (high ground stress and low gas pressure), the propagation of impact force in the roadway is more hindered. Both impact force and acoustic emission signals can monitor the occurrence of outburst. The peak point of acoustic emission ringing count is earlier than the impact force. The acoustic emission signal can monitor the outburst hazard earlier. The impact force can more specifically reflect the coal fracture.

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Section: Evolution Characteristics Analysis Of Impact Forcesupporting

confidence: 94%

Macroscopic fracture mechanism of coal body and evolution characteristics analysis of impact force in deep coal and gas outburst

Ren,

Tang,

Pan

et al. 2023

Sci Rep

View full text Add to dashboard Cite

show abstract

“…There is also a small amount of research on the arcing-blade cutter. Jiang et al [18] used PFC3D to establish a rotational cutting model of the arcing-blade cutter and simulate its rock-breaking process. Zhang et al [19] simulated the dynamic indentation process of the arcing-blade cutter and analyzed the change in rock-breaking load under different peripheral pressures.…”

Section: Introductionmentioning

confidence: 99%

A Study on the Rock-Breaking Characteristics of an Arcing-Blade Cutter under Different Cutting Parameters

Ma,

Ye,

Zhang

et al. 2024

Applied Sciences

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To analyze the rock-breaking characteristics of an arcing-blade cutter in cutting red sandstone, a two-cutter cutting model was established based on the finite element method. Then, the cutting processes of the arcing-blade cutter at penetrations of 2 mm, 4 mm, and 6 mm with different cutter spacings were investigated, and the changing rules of the rock-breaking load, rock crushing state, and rock-breaking efficiency were obtained. Subsequently, the obtained simulation results were validated through linear cutting experiments. The research results showed that, as the penetration of the arcing-blade cutter increased, the rock-breaking load also increased; specifically, under 2 mm penetration, the rock-breaking load remained stable, irrespective of the cutter spacing. However, under 4 mm and 6 mm penetration, the vertical and rolling force increased and then stabilized with an increase in the cutter spacing, while the lateral force decreased and then stabilized, attributed to the synergistic effect between the cutters. At 2 mm penetration, the absence of interaction between the cutting of two cutters in sequence resulted in two separate crushed areas on the rock surface. However, at 4 mm and 6 mm penetration, the rock ridge could be crushed under a smaller cutter spacing. Meanwhile, with an increase in the cutter spacing, the synergistic effect between the cutters diminished, causing the rock ridge between two cuttings to remain uncrushed. The specific energy at the 4 mm and 6 mm penetrations decreased initially with an increase in the cutter spacing, then increased, and eventually stabilized. The optimal cutter spacings at these penetrations were determined as 50 mm and 60 mm, respectively. Conversely, at 2 mm penetration, the specific energy remained almost unchanged with an increase in the cutter spacing, maintaining at a high level and resulting in a low efficiency in cutting rock.

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Research on Adaptability of CS and BT Hobs to Break Soft and Hard Rock

Zhang,

Long,

TaoTan

et al. 2024

KSCE J Civ Eng

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Comparative Study of the Rock-breaking Mechanism of a Disc Cutter and Wedge Tooth Cutter by Discrete Element Modelling

Cited by 5 publications

References 32 publications

Macroscopic fracture mechanism of coal body and evolution characteristics analysis of impact force in deep coal and gas outburst

Macroscopic fracture mechanism of coal body and evolution characteristics analysis of impact force in deep coal and gas outburst

A Study on the Rock-Breaking Characteristics of an Arcing-Blade Cutter under Different Cutting Parameters

Research on Adaptability of CS and BT Hobs to Break Soft and Hard Rock

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