An experimental and numerical study of sandstone fractures caused by modified and CCS cutters

Liu, Jie; Jiang, Gangyuan; Huang, Zhonghua; Liu, Taoying

doi:10.1016/j.engfracmech.2022.108627

Cited by 6 publications

(1 citation statement)

References 37 publications

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“…Among them, the structural parameters of the disc cutter are mainly affected by the cross-sectional shape of the cutter. Thus, selecting an appropriate blade shape for the cutter according to the specific rock formations can significantly enhance the TBM's construction efficiency [8,9]. Consequently, research on the blade shape of the cutter has received considerable attention among scholars, as it has the potential to improve TBM performance.…”

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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Section: Introductionmentioning

confidence: 99%