Coal-like material for coal and gas outburst simulation tests

Hu, Qianting; Shu-tong, Zhang; Wen, Guangrui; Dai, Linchao; Wang, Bo

doi:10.1016/j.ijrmms.2015.01.005

Cited by 64 publications

(42 citation statements)

References 5 publications

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“…e mechanical properties of coal have a significant influence on the occurrence and development of a coal and gas outburst [24,25]. Based on the existing similar materials, cement was selected as the cementing agent, crushed coal was selected as the aggregate, and sand, Shock and Vibration activated carbon, and water were selected as auxiliary materials for this similar simulation experiment [26]. e specific properties are shown in Table 1.…”

Section: Experimental Materialsmentioning

confidence: 99%

A Study on the Energy Condition and Quantitative Analysis of the Occurrence of a Coal and Gas Outburst

Dai

Liu

Cao

et al. 2019

Shock and Vibration

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With mining depths increasing, coal and gas outburst disasters are becoming more and more serious and complicated, which directly restricts the production efficiency of coal mines. In order to study the rules of energy dissipation during the occurrence of a coal and gas outburst based on the occurrence mechanisms, a simulation experiment of a coal and gas outburst with a ground stress of 16 MPa and a gas pressure of 0.5 MPa was carried out using a self-developed large-scale coal and gas outburst simulation experimental system. A quantitative analysis was given based on the energy model. The results showed the following: (1) In the process of the coal and gas outburst, the main energy source originated from the elastic potential energy of the coal body and the gas internal energy. The main energy loss was used for coal crushing and throwing. (2) The outburst coal sample in this experiment had a mass of 18.094 kg, and the relative outburst intensity was 1.21%. Additionally, the farthest throwing distance of the outburst coal samples was 3.3 m away from the outburst hole wall. The distribution of the outburst coal sample decreased along the roadway, and the proportion of the coal sample grain size in each area first decreased and then increased with the decrease of the grain size. The coal samples with a grain size less than 0.2 mm after the outburst accounted for 6.34% of the mass of the total coal samples. (3) The elastic potential energy of the coal body accounted for 0.34% of the total outburst energy, while the gas internal energy accounted for 99.66%. It was verified that gas internal energy was the key energy source for the coal and gas outburst, and this internal energy was two orders of magnitude more than the elastic potential energy, playing a leading role in the outburst process. After the outburst initiation, most of the energy was consumed in coal crushing, which was in the same order of magnitude as the gas internal energy. Moreover, the energy losses due to friction, vibration, and sound during the outburst process comprised no more than 10% of the total energy. The research results can provide certain guidance for clarifying the mechanism of a coal and gas outburst and the quantitative analysis of outburst energy.

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Section: Experimental Materialsmentioning

confidence: 99%

A Study on the Energy Condition and Quantitative Analysis of the Occurrence of a Coal and Gas Outburst

Dai

Liu

Cao

et al. 2019

Shock and Vibration

Self Cite

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“…In addition, the VW-6000 dynamic analysis system made by Keyence was used in the experiment to record the instant outburst moments with the system's high-speed video recording function. Briquettes have been widely used in many experiments to reveal the internal mechanism of coal and gas outbursts [30][31][32]. The experimental results show that a briquette can effectively simulate a destroyed coal seam of high porosity and low intensity [3].…”

Section: Materials and Experiments Apparatusmentioning

confidence: 99%

Gas Release Characteristics in Coal under Different Stresses and Their Impact on Outbursts

et al. 2018

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The impact mechanism of in situ stress on outbursts plays a key role in the prevention of outbursts during deep coal mining. The in situ stress may influence the outburst by affecting the gas release intensity according to theoretical analysis, but none of the existing studies have taken into consideration this perspective. To explore whether the influence of in situ stress on gas release in coal is an important reason for stress-induced outbursts, experiments on gas release in coal under different axial stresses and on exposure-induced outbursts with different gases were conducted to respectively study the influence of in situ stress on gas release and the impact of gas release on outburst. The results show that with the increase of stress, the methane release intensity rises by 1~2.4 times and shows an obvious periodicity due to different degrees of fracture development. A small increase in gas release intensity can lead to huge increase in the outburst intensity based on an energy analysis of the outburst experiments, indicating that the gas release intensity is a sensitive physical quantity that influences outbursts. The differences in gas release in coal with different stresses will result in differences in the outburst results based on data from the two experiments, proving that the change in gas release intensity during variations of in situ stress is an important factor for in situ stress-induced outbursts. The research achievements can enrich the impact mechanism of in situ stress on outbursts.

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“…Similar simulation experiments are important research method commonly used in geotechnical engineering, in particular, in coal mining. Thus, they have been used to study the influence of underground mining on slope movement [1], coal mining subsidence in mining area after coal mining [2,3], development pattern of mining fissures [4,5], overburden movement pattern of coal seams [6][7][8], coal and gas outburst [9,10], and so on. However, many influencing factors affect mechanical test results, which implies instability of mechanical properties of rock-soil similar materials and low test repeatability.…”

Section: Introductionmentioning

confidence: 99%

Effect of Sand Particle Size on Microstructure and Mechanical Properties of Gypsum-Cemented Similar Materials

Guan

Zhang

et al. 2020

Materials

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To identify mechanism of sand particle size effect on the mechanical properties of gypsum cement, 11 grades of sand particles with a size of 0.1–3 mm were used to produce 99 specimens for uniaxial compression and permeability coefficient testing. Based on this, the distribution characteristics of internal stress and horizontal displacement are discussed using the numerical analysis. The results obtained show that the sand particle size effect on the uniaxial compressive strength of similar materials is negatively correlated within the range from −16.51% to 49.79%. SEM observations imply that, in the case of small particle sizes, gypsum crystals develop into denser needle-like structures, while for larger particle sizes, they are mostly loose lamellar structures. Permeability tests indicated that the larger the sand particle size, the greater the permeability, indicating that the internal pore connectivity is better, and the crevices are easier to penetrate when the specimen is compressed. Numerical simulations indicated that the larger the particle size, the larger the extreme deformation value of the specimen in the horizontal direction, and the more uneven the deformation distribution. In addition, specimens with larger particle sizes had a larger total area, where the tensile stress exceeded the ultimate tensile strength, and were more prone to tensile failure.

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Coal-like material for coal and gas outburst simulation tests

Cited by 64 publications

References 5 publications

A Study on the Energy Condition and Quantitative Analysis of the Occurrence of a Coal and Gas Outburst

A Study on the Energy Condition and Quantitative Analysis of the Occurrence of a Coal and Gas Outburst

Gas Release Characteristics in Coal under Different Stresses and Their Impact on Outbursts

Effect of Sand Particle Size on Microstructure and Mechanical Properties of Gypsum-Cemented Similar Materials

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