Exploration and Practice of Pressure Relief by Slotting Coal Seams with a Diamond Wire Saw

Tang, Zhu; Liu, Shuqing; Huang, Fei; Huang, Shouqing; Kang-xu, Cai

doi:10.1155/2021/9961326

Cited by 2 publications

(3 citation statements)

References 5 publications

(3 reference statements)

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“…In order to evaluate the similarities and differences with related research work, we referred to Tang's paper (Tang, 2021). This paper focuses on the study of horizontal coal seams, where the advancing process of rope saw cutting coal seam is divided into 7 times, each advancing distance being 270 mm, and the next advancing is carried out after the state of the previous coal seam is stable, with a total of 1890 mm.…”

Section: Discussmentioning

confidence: 99%

“…Therefore, this method of pressure relief may yield better results in actual coal seams than in laboratory tests or numerical simulations. In terms of numerical simulation results, we referred to the calculation methods of Tang (Tang, 2021) and Zhu (Zhu, 2022). FLAC3D and UDEC were utilized to examine the stress distribution of diamond beaded rope saws cutting.…”

Section: Discussmentioning

confidence: 99%

“…Based on the technological idea of coal seam cutting and pressure relief, researchers are exploring a new method of creating fractures that is more efficient and reliable (Yan et al, 2015;Tang et al, 2021;. Previous studies have demonstrated that the diamond beaded rope saw is effective in cutting through rock masses (Konstanty, 2021).…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Research on the pressure relief law of diamond beaded rope saw cutting seam: a numerical investigation

Zhang,

Wang,

et al. 2023

Preprint

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As a new technology to mitigate the high outburst risk of the low permeability coal seam, it is essential to delve deeper into the law and mechanism of pressure relief associated with the diamond beaded rope saw slotting. The paper presents a numerical calculation model under small size that is based on the superimposed beam theory and the contact surface model. The model is compared with the experimental results of similar models in the laboratory to verify its applicability for simulating the numerical calculation of stress distribution in coal seam cut by diamond beaded rope saw. The study then goes on to investigate the influence of coal seam inclination, working face length, coal seam hardness, and seam advancing distance on the pressure relief effect of diamond beaded rope saw cutting seam under engineering scale. The mechanism of the diamond beaded rope saw cutting seam is also analyzed. The results indicate that the diamond beaded rope saw effectively reduces pressure in low permeability coal seams, with the impact range extending to the slit area. Additionally, stress concentration was observed at the front of the slit. Increasing the inclination of the coal seam, working face length, and advancing distance of the cutting seam enhances the pressure relief effect of the diamond beaded rope saw. The latter two factors’ influence is reflected in the parallel and advancing direction of the working face, respectively. Soft coal has been shown to respond better to this method than hard coal. This research is significant in promoting the widespread application of diamond beaded rope saws in the pressure relief of coal seam cutting.

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Section: Discussmentioning

confidence: 99%

Section: Discussmentioning

confidence: 99%

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Research on the pressure relief law of diamond beaded rope saw cutting seam: a numerical investigation

Zhang,

Wang,

et al. 2023

Preprint

View full text Add to dashboard Cite

show abstract

Numerical simulation of pressure relief stress distribution of diamond beaded rope saw cutting in low permeability coal seam

Wang,

et al. 2023

Geomech. Geophys. Geo-energ. Geo-resour.

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The diamond bead slit is a practical method for changing the stress distribution of low permeability coal seam and achieving pressure relief and reflection improvement. The stress distribution of coal seam in large scale is not clear due to the influence of diamond bead slit parameters and geological parameters, making it difficult to identify. In this paper, the finite element model with built-in Coulomb friction contact surface is used to simulate the stress distribution in coal with different angles, seam length, working face length, seam friction coefficient and different in-situ stress difference. This investigation is conducted to examine the stress distribution of parallel working face, vertical coal seam, and advance working face. The simulation results show that the mechanism of stress transfer in large scale diamond beaded rope saw cutting coal seam is mainly due to the tangential slip of coal body on both sides of seam surface, forming concentrative zone and pressure relief zone with axial distribution, center symmetry and phase. The pressure relief range and maximum pressure relief range of all three direction present a "single peak" distribution with the change of angel α between slit and maximum in-situ stress, i.e. when α = 45°, both of them are maximum. The slit length mainly affects the stress distribution in the advancing direction of the working face, and the length of working face mainly affects the stress distribution in the direction of parallel working face and vertical coal seam, both of which are positively correlated with the pressure relief range and the maximum pressure relief amplitude. The friction coefficient of seam surface and the difference of in-situ stress affect the relative dislocation of coal body on both sides of seam surface, and they inhibit and promote the pressure relief range and the maximum pressure relief amplitude respectively, and are greatly affected by α. The simulation results above suggest that it is reasonable to select fracture and geological parameters in practical engineering.

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Exploration and Practice of Pressure Relief by Slotting Coal Seams with a Diamond Wire Saw

Cited by 2 publications

References 5 publications

Research on the pressure relief law of diamond beaded rope saw cutting seam: a numerical investigation

Research on the pressure relief law of diamond beaded rope saw cutting seam: a numerical investigation

Numerical simulation of pressure relief stress distribution of diamond beaded rope saw cutting in low permeability coal seam

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