Review of preventive and constructive measures for coal mine explosions: An Indian perspective

Ray, S. K.; Khan, Asfar Mobin; Mohalik, N.K.; Mishra, Debashish; Mandal, Sujata; Pandey, Jai Krishna

doi:10.1016/j.ijmst.2022.02.001

Cited by 52 publications

(16 citation statements)

References 58 publications

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“…At the same time, as the world population increases, the demand for space for infrastructure development also increases, so the importance of underground space is becoming more prominent. As the operating depth increases, the operating conditions become more and more difficult, so that one is faced with a complex technical environment, such as high geo-stress, high geothermal temperature, increased shock loads and increased water shocks [2][3][4]. Therefore, in the extraction of mineral, oil and gas resources at depth, energy disasters often occur and the extraction becomes more and more difficult.…”

Section: Introductionmentioning

confidence: 99%

Dynamic mechanical response and crack evolution law of raw coal loaded by dynamic-static coupling under three-dimensional constraints

Zhao,

Wei,

Zhang

et al. 2023

Preprint

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Investigation of the dynamic mechanical properties of coal rock under complex stress conditions at depth. In this work, based on the improved Separate Hopkinson Pressure Bar Test System, 15 groups of coal samples were used to perform dynamic impact tests under different conditions. The changing rules of dynamic strength, crushing, fractal dimension and damage modes of coal under different stress conditions were analyzed. And 9 groups of coal specimens were selected for numerical simulation using ANSYS/LS-DYNA. The results show that: (1) The stress-strain curves of coal specimens under different strain rates, different circumferential pressures and axial pressures basically have the same trend of a bimodal phenomenon. (2) The peak dynamic stress of the coal specimens increased linearly with the increase of strain rate and confining pressure, and the ambient pressure limited the expansion of the internal cracks of the coal specimens under impact loading. And based on the experimental and simulation data, the maximum relative errors between the two are derived as (Group A: 2.9578%, Group B: 6.177%, Group C:6.382%) (3) The damage modes of the coal specimens under the three-dimensional dynamic-static combined loading were mainly "X" type and "conical" shear damage modes. The fractal dimension increases with the increase of strain rate, decreases with the increase of circumferential pressure, and first decreases and then increases with the increase of axial pressure.

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Section: Introductionmentioning

confidence: 99%

Dynamic mechanical response and crack evolution law of raw coal loaded by dynamic-static coupling under three-dimensional constraints

Zhao,

Wei,

Zhang

et al. 2023

Preprint

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“…For instance, some mines in South Africa and Canada have reached a depth of 3000–4000 m (Counter, 2014; Lippmann‐Pipke et al, 2011). However, in China, the mining depth is mostly below 800–1100 m (Ray et al, 2022; Xie et al, 2019); about 12 000 km of coal mine tunnels is excavated annually in China (He, 2022). Work conditions gradually become complicated with an increase in the mining depth, resulting in high in situ stresses, high seepage pressure, strong dynamic disturbance, and high ground temperature (He, 2022; Ray et al, 2022; Xie et al, 2019).…”

Section: Introductionmentioning

confidence: 99%

“…However, in China, the mining depth is mostly below 800–1100 m (Ray et al, 2022; Xie et al, 2019); about 12 000 km of coal mine tunnels is excavated annually in China (He, 2022). Work conditions gradually become complicated with an increase in the mining depth, resulting in high in situ stresses, high seepage pressure, strong dynamic disturbance, and high ground temperature (He, 2022; Ray et al, 2022; Xie et al, 2019). The mechanical properties of the deep rock subjected to the dynamic disturbance environment play a vital role in underground engineering designs and constructions (Liu et al, 2021).…”

Section: Introductionmentioning

confidence: 99%

Development and applications of the quasi‐dynamic triaxial apparatus for deep rocks

Luo,

Cai,

et al. 2023

Deep Underground Science and Engineering

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The mechanical behaviors of deep rocks have always posed a challenge for the implementation and safe operation of major underground engineering projects. To this end, this study modified the existing mainstream rock mechanics instruments equipped with a dynamic disturbance loading system and developed a second‐generation TFD‐2000/D triaxial instrument. The first‐generation device is equipped with an independent disturbance system and an advanced EDC‐580 all‐digital servo controller, which can apply disturbing load independently, implement the function of cyclic disturbance, and combine dynamic and static disturbances. The instrument was found to be reliable for use in analyzing the damage process of rocks in the disturbance test of marbles. The second‐generation instrument tackles three limitations of the first‐generation instrument: (i) it upgrades the strain measurement system and uses extensometers with linear variable differential transformers to accurately measure deformation; (ii) it uses the self‐balanced chamber to replace the Hoek–Franklin triaxial cell and auto‐balancing triaxial pressure chamber; and (iii) the loading rod is independently equipped with an EDC‐580 all‐digital servo controller, which measures precise loads. The experimental findings confirmed that the second‐generation instrument can be used for rock mechanics testing under cyclic disturbance loading, the disturbance–stress relaxation cycle, and the creep–fatigue cycle. In this sense, the second‐generation instrument can be a useful addition to deep rock mechanical instruments and provide a valuable reference.

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“…Coal dust threatens the safety production and environmental protection of mines. It can burn and explode, and cause extremely serious accidents and losses [1][2][3][4][5]. On the other hand, coal dust negatively impacts the air quality in the mining area and causes severe health hazards.…”

Section: Introductionmentioning

confidence: 99%

Exploration of the Relationships between the Spraying Condition and Wetting Behavior on Coal Surface of Dust Suppression Droplet: Improving the Utilization Rate

Han

Peng

et al. 2022

Geofluids

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Dust suppression through water-based media is an important technical means, which is of great significance to industrial process safety and environmental protection. In order to improve the utilization rate of droplets, the dynamic spreading process of droplets impacting the coal surface was studied by the coupled level-set and volume-of-fluid methods (CLSVOF) method. The spread area was calculated by the binary method to characterize the wetting effect. Dimensionless spread area per unit volume (DSAPUV) was proposed to represent the utilization of droplets. The results show that the droplet spreading fracture process can be divided into three stages: initial deformation period, spreading fracture period, and stable period. When the particle size was not being changed, the area of dimensionless spread does not increase consistently with velocities, but there exists an optimal critical velocity of impingement, which is 17 m/s for the maximum dimensionless spread area reached by droplets with a diameter of 30 μm and 19 m/s for the maximum dimensionless spread area reached by droplets with a diameter of 50 μm. Droplet size is directly proportional to the dimensionless spread area. The maximum dimensionless spread areas of the droplets were all reached during spreading, and the time required increased gradually with increasing particle sizes. It was found that the effect of droplet size on the utilization of droplets was obvious when their size ranged from 10 μm to 50 μm, and their velocity ranged from 15 m/s to 20 m/s.

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Review of preventive and constructive measures for coal mine explosions: An Indian perspective

Cited by 52 publications

References 58 publications

Dynamic mechanical response and crack evolution law of raw coal loaded by dynamic-static coupling under three-dimensional constraints

Dynamic mechanical response and crack evolution law of raw coal loaded by dynamic-static coupling under three-dimensional constraints

Development and applications of the quasi‐dynamic triaxial apparatus for deep rocks

Exploration of the Relationships between the Spraying Condition and Wetting Behavior on Coal Surface of Dust Suppression Droplet: Improving the Utilization Rate

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