An experimental study of the damage characteristics of gas-containing coal under the conditions of different loading and unloading rates

Zhang, Minbo; Lin, Manqing; Zhu, Huangqiu; Zhou, Dehong; Wang, Longkang

doi:10.1016/j.jlp.2018.07.006

Cited by 27 publications

(16 citation statements)

References 15 publications

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“…Disasters have important theoretical and practical significance [30]. The results of this study potentially provide a design basis for future gas drainage and outburst prevention measures [31]. They also have practical significance for the engineering design of raw coal masses with different water-bearing states during mining.…”

Section: State Of the Artmentioning

confidence: 88%

Damage Deformation and Acoustic Emission Characteristics of Raw Coal under Different Moisture Contents

Ren

Dong

2020

Teh. vjesn.

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Coal seam with different moisture contents considerably affects coal mining and gas extraction. The coal seam with moisture contents has unique damage deformation characteristics that differ from dry coal. Therefore, the damage deformation characteristics of coal seam with different moisture contents need to be investigated to enhance the effects of coal mining and gas extraction. To explore the damage and deformation laws and acoustic emission (AE) characteristics of coal samples with different moisture contents, coal samples with different moisture contents were prepared for triaxial compression AE localization tests, and the stress-strain characteristic parameters and AE counts, cumulative AE counts, AE energy, and cumulative AE energy of coal samples were prepared. The damage models of coal samples with different moisture contents were established based on AE counts, and the damage and deformation laws were analyzed. Results show that the peak intensities of coal samples decrease with the increase in moisture contents, the dry coal sample mainly undergoes shear failure, and the water-containing coal samples are pronounced by lateral splitting. The peak and cumulative AE counts of the coal samples decreased as the moisture contents increased. The peak and cumulative AE energies of coal samples decreased with the increase in moisture contents. The damage model established based on AE counts has a high degree of fit. Moreover, the damage amount of the coal samples increased with the moisture contents. The conclusions obtained in this study have practical guiding significance for demonstrating the mechanism and process of coal body dynamic disasters in actual engineering.

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Section: State Of the Artmentioning

confidence: 88%

Damage Deformation and Acoustic Emission Characteristics of Raw Coal under Different Moisture Contents

Ren

Dong

2020

Teh. vjesn.

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“…A large number of experiments have been conducted on the coal permeability changes induced by temperature and pressure . The experimental results also indicate that the coal permeability decreases with the increase in temperature and pressure in a function with a negative exponent . The temperature and pressure increase with the coal seam depth increase, and the depth changes are essentially the changes in temperature and pressure.…”

Section: Discussionmentioning

confidence: 99%

“…18,24 The experimental results also indicate that the coal permeability decreases with the increase in temperature and pressure in a function with a negative exponent. [19][20][21]24,25,48 The temperature and pressure increase with the coal seam depth increase, and the depth changes are essentially the changes in temperature and pressure. The coal permeability variation induced by the buried depth will be consistent with the variation behavior of permeability induced by temperature and pressure.…”

Section: Permeability Changes In Different Deep Anthracite Reservoimentioning

confidence: 99%

An experimental study on the permeability changes of anthracite reservoirs in different depths of Qinshui Basin induced by supercritical CO₂ injection

Jia

Cao

2019

Energy Science & Engineering

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Geological sequestration of supercritical CO2 (ScCO2) in deep coal seam has been considered as one of the most promising options for reducing greenhouse gas emission. The permeability of a coal seam, a key parameter estimating the CO2 injectivity, determines the success of ScCO2 storage in the deep coal seam. The deep coal seam has a low initial permeability and a further permeability loss induced by the adsorption‐swelling effects of coal during ScCO2 injection. This paper presents a set of measurements on the permeability changes of anthracite reservoirs in different depths of Qinshui Basin induced by ScCO2 injection. The results indicate that the change in anthracite permeability presents a negative exponential decrease with the buried depth increase. The depth of anthracite reservoir increases from 800 to 1400 m, and its permeability will decrease from 4.59 × 10−2 to 8.04 × 10−4 mD. The permeability change induced by ScCO2 injection is the combining effects of temperature, pressure, and adsorption‐swelling, and the permeability change can be described by a negative exponential model during ScCO2 injection to anthracite reservoir in different depths. The loss coefficient of permeability is up to three magnitudes induced by ScCO2 injection to the anthracite reservoir in the depth of 800 m, 2‐3 magnitudes in 1000‐1200 m, and 1‐2 magnitudes in 1400 m. Although the initial permeability of anthracite reservoirs in the same depth exists differences, the permeability loss coefficient almost has the same magnitudes induced by ScCO2 injection. Comparing with the permeability loss coefficient of the anthracite reservoir in different depths, the permeability variation of the shallow coal seam is more sensitive than the deep induced by ScCO2 injection. However, the deep coal seam has a relatively large fracture pressure, so the allowable ScCO2 injection pressure in the deep coal seam is greater than the shallow.

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“…Wang et al studied the gas distribution law in the coal seam after hydraulic punching; they believed that the pressure relief antireflection area of punching will experience four processes of stress rise, crack development, rapid stress release, and restoration of balance; moreover, the area around the hole was divided into the gas discharge zone, gas pressure transition zone, and original gas pressure zone in order from near to far, respectively [27]. On the basis of the mining dynamics path, Zhang et al studied the mechanical tests of coal containing gas at different loading and unloading rates and established the mathematical model of damage evolution based on the logistics equation [28]. Mu et al examined the impact of the different pressures of a water jet on the formation of damage on the coal body and revealed that the coal body under the impact of a high-pressure water jet forming compression wave and stretch wave composite roles is the main reason for the damage.…”

Section: Introductionmentioning

confidence: 99%

Research and Application of Hydraulic Punching Pressure Relief Antireflection Mechanism in Deep “Three‐Soft” Outburst Coal Seam

2021

Shock and Vibration

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To solve the problems of gas predrainage in deep seams with “three softs” and low-air permeability, hydraulic punching pressure relief antireflection technology is proposed on the basis of the research background of gas predrainage technology in Lugou Mine to alleviate technical problems, such as low gas drainage efficiency, in this mine. Through the analysis of the mechanism of hydraulic punching and coal breaking, combined with FLAC3D software, a hydraulic punching pressure relief antireflection model is established. Then, the fracture radii of coal rock are simulated and calculated. The results show that, under hydraulic punching with a water pressure of 10 MPa and coal outputs of 3 m3, 6 m3, 9 m3, and 12 m3, the fracture radii of coal and rock are 3.4 m, 4.8 m, 5.5 m, and 5.9 m, respectively. Using the software to fit the relationship between coal output V and hydraulic punching fracture radius R under the same water pressure, R = 2.32479 V0.3839 is obtained. The field test is carried out in the bottom drainage roadway of 32141 in Lugou Mine. The application effect is as follows: the gas concentration of hydraulic punching with a coal output of 3 m3 is twice that of ordinary drilling, and the coal output of hydraulic punching with a coal output of 6 m3 is four times that of ordinary drilling. The extraction concentration is four times that of ordinary drilling, and the extraction concentration of hydraulic punching with a coal output of 9 m3 is 6.4 times that of ordinary drilling. Combining the results of the numerical simulation and taking into account the actual construction situation on site, the coal output of water jetting from the borehole is 9 m3, and the fracture radius is 5.5 m. This outcome means that the effective half radius is 5.5 m, and the borehole spacing is 7.7 m. These values are the construction parameters for large-scale applications. This proposal provides effective technology and equipment for gas drainage in the deep three-soft coal seam. Consequently, it has promotion and reference significance for gas drainage in coal seam of the same geological type.

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An experimental study of the damage characteristics of gas-containing coal under the conditions of different loading and unloading rates

Cited by 27 publications

References 15 publications

Damage Deformation and Acoustic Emission Characteristics of Raw Coal under Different Moisture Contents

Damage Deformation and Acoustic Emission Characteristics of Raw Coal under Different Moisture Contents

An experimental study on the permeability changes of anthracite reservoirs in different depths of Qinshui Basin induced by supercritical CO₂ injection

Research and Application of Hydraulic Punching Pressure Relief Antireflection Mechanism in Deep “Three‐Soft” Outburst Coal Seam

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An experimental study of the damage characteristics of gas-containing coal under the conditions of different loading and unloading rates

Cited by 27 publications

References 15 publications

Damage Deformation and Acoustic Emission Characteristics of Raw Coal under Different Moisture Contents

Damage Deformation and Acoustic Emission Characteristics of Raw Coal under Different Moisture Contents

An experimental study on the permeability changes of anthracite reservoirs in different depths of Qinshui Basin induced by supercritical CO2 injection

Research and Application of Hydraulic Punching Pressure Relief Antireflection Mechanism in Deep “Three‐Soft” Outburst Coal Seam

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An experimental study on the permeability changes of anthracite reservoirs in different depths of Qinshui Basin induced by supercritical CO₂ injection