Modelling of ventilation and dust control effects during tunnel construction

Zhou, Wenjie; Nie, Wen; Liu, Changqi; Liu, Qiang; Wang, Hetang; Wei, Cunhou; Yan, Jerry; Yin, Shuai; Xiu, Zihao; Xu, Chen

doi:10.1016/j.ijmecsci.2019.06.037

Cited by 83 publications

(16 citation statements)

References 82 publications

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“…In particular, the number of pneumoconiosis cases in coal mining industry accounts for 40% of the total number of the reported occupational cases. erefore, it is extremely urgent to adopt high-efficiency dust-suppression and dust-control measures to reduce the dust concentration in coal production sites [14][15][16][17][18].…”

Section: Introductionmentioning

confidence: 99%

Effects of Metamorphic Degree of Coal on Coal Dust Wettability and Dust‐Suppression Efficiency via Spraying

Wang

Han

Liu

et al. 2020

Advances in Materials Science and Engineering

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Currently, spraying is a main means for dust prevention and control in underground coal mines. The dust-suppression efficiency via spraying is highly correlated with the wettability of coal dusts. There are many factors affecting the wettability of coal dust, among which coal’s metamorphic degree has great influence. In order to gain in-depth knowledge of the effects of coal metamorphic degree on coal dust wettability and the dust-suppression efficiency via spraying, 6 coal dust samples with different metamorphic degrees were collected and used in the study. In the experiments, the microproperties, wetting performance, and dust-suppression efficiency via spraying were measured. According to the experimental results of coal’s microproperties, with the improvement of metamorphic degree, the content of hydrophilic oxygen-containing functional groups on the surface, the surface roughness, the specific surface area, and the interpore diameter all decreased. In addition, as coal’s metamorphic degree was enhanced from lignite to meager-lean coal, the wettability of the coal dust dropped. On the other hand, as the metamorphic degree of coal quality continued to be improved to anthracite, the wettability of the coal dust increased instead. The measured results revealed that the dust-suppression efficiency via spraying was highly correlated with the wettability of coal dust. The coal dust with better wettability exhibited higher dust-suppression efficiency via spraying. With the increase of water-supply pressure, the effect of coal dust wettability on the dust-suppression efficiency via spraying was weakened, and the difference of dust-suppression efficiency among different coal dust samples was narrowed.

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Section: Introductionmentioning

confidence: 99%

Effects of Metamorphic Degree of Coal on Coal Dust Wettability and Dust‐Suppression Efficiency via Spraying

Wang

Han

Liu

et al. 2020

Advances in Materials Science and Engineering

View full text Add to dashboard Cite

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“…A large amount of dust is generated during the coal mining process, causing the high-concentration dust environments for the workers, which poses a serious threat to their health and safety [10][11][12][13][14][15]. At present, the underground coal mining operations mainly use the dust-prevention measures including prefilling coal with water, dust control by ventilation, dust purification by dust collector, dust reduction via spraying, and dust blocking in an enclosed area [16][17][18][19][20]. Dust reduction via spraying is cost economic, simple, and practical and thus has become the main dust-prevention technology for coal mines [21][22][23][24][25][26][27].…”

Section: Introductionmentioning

confidence: 99%

An Experimental Study on Wetting of Coal Dust by Surfactant Solution

Jiang

Wang

Liu

et al. 2020

Advances in Materials Science and Engineering

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Surfactants can improve the wetting performance of the dust-reduction spraying water, thus improving the dust-reduction effect by spray. In this study, the performance of surfactant solution in wetting coal dust was investigated through experiments. In addition, the effects of surfactant type, mass fraction, metamorphic degree of coal, particle size, and additives were investigated. According to the results of surface tension experiments, the surface tension of the solution decreased with the increase of the concentration of surfactant. However, after reaching CMC, the surface tension did not have significantly decrease. SDBS and OP-10 had higher efficiency in decreasing the surface tension than the other two types of surfactants. The addition of sodium sulfate additives can further reduce the surface tension of the surfactant solution by a limited range. The coal dust wetting experiment showed that with the increase in the concentration of the surfactant, the contact angle of the droplets on the coal dust tablet was continuously reduced, and the wettability of the solution was continuously improved. The wettability of the OP-10 solution was optimal. At the same concentration, the minimum contact angle can be obtained in the OP-10 solution. As the contact angle of the coal dust increased, the growth rate in the coal dust reverse osmosis moisture absorption of the surfactant solution relative to the pure water increased. After the addition of sodium sulfate, the reverse osmosis moisture absorption of coal dust increased to varying degrees. In addition, as the concentration of additives increased, the moisture absorption of coal dust increased.

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“…Thus, mechanical models need to be established that can sufficiently reflect the anisotropic characteristics of layered rocks and thoroughly explain their transversely isotropic deformation and failure characteristics . These models should be based on the mechanical properties and field monitoring information of the layered rocks to improve the accuracy of the calculations of the deformation and failure of the deep surrounding layered rocks and ensure the safety and stability of deep underground structures …”

Section: Introductionmentioning

confidence: 99%

“…7,8 These models should be based on the mechanical properties and field monitoring information of the layered rocks to improve the accuracy of the calculations of the deformation and failure of the deep surrounding layered rocks and ensure the safety and stability of deep underground structures. 9,10 Critical progress has been made in research on the yield criteria and constitutive models for layered rocks. According to the differences among the assumptions and algorithms, either (a) discrete element methods or (b) equivalent continuum methods are employed to solve the computational problems of layered rocks.…”

Section: Introductionmentioning

confidence: 99%

Anisotropic modeling of layered rocks incorporating planes of weakness and volumetric stress

Tan

Zhou

et al. 2019

Energy Science & Engineering

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Layered rocks exhibit notable transverse isotropy and have a significant impact on the deformation and failure characteristics of underground structures. To a large extent, the mechanical properties of layered rocks are related to the structure and stress state of their bedding planes. To obtain an in‐depth understanding of the deformation and yield characteristics of layered rocks, a mechanical model for layered rocks incorporating planes of weakness and volumetric stress is proposed by improving the strain‐hardening/softening ubiquitous‐joint model based on continuum mechanics methods. In this mechanical model, elastoplastic equations for the matrix and bedding planes of layered rocks are established. The evolution of the mechanical parameters of the matrix and bedding planes of layered rocks with the internal variable is determined. In addition, the sensitivity of the model parameters is analyzed, and a method for determining the parameters is provided to reduce the complexity in obtaining these parameters. The numerical calculation results for the laboratory tests on layered sandstone specimens under various stress levels agree relatively well with the test results, thereby validating the effectiveness of the improved model. The methods and results of this study provide a significant reference for the analysis of the deformation and failure of other layered rocks.

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Modelling of ventilation and dust control effects during tunnel construction

Cited by 83 publications

References 82 publications

Effects of Metamorphic Degree of Coal on Coal Dust Wettability and Dust‐Suppression Efficiency via Spraying

Effects of Metamorphic Degree of Coal on Coal Dust Wettability and Dust‐Suppression Efficiency via Spraying

An Experimental Study on Wetting of Coal Dust by Surfactant Solution

Anisotropic modeling of layered rocks incorporating planes of weakness and volumetric stress

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