Uneven stress and permeability variation of mining-disturbed coal seam for targeted CBM drainage: A case study in Baode coal mine, eastern Ordos Basin, China

Xu, Chao; Yang, Gang; Wang, Kai; Fu, Qiang

doi:10.1016/j.fuel.2020.119911

Cited by 74 publications

(25 citation statements)

References 25 publications

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“…There is a corresponding relationship between abutment stress and rock permeability. The corresponding expression between rock permeability coefficient K and abutment stress is as follow (Li et al, 2004; Xu et al, 2021): Where A 1 and A 2 are test regression coefficients, and A 1 , A 2 >0, can be obtained by laboratory tests (Xu et al, 2021). The permeability coefficient of strata has a positive correlation with normale − σ z.…”

Section: Resultsmentioning

confidence: 99%

“…Zhang et al (2018) explored area change of overburden permeability, and found that the realistic permeability-increasing area of the protective seam was more than that of goaf. In addition, the optimized cross-drilling was proposed for an on-site gas drainage test, which solved the danger of coal seam outburst Xu et al (2021) obtained the uneven distribution characteristics of stress and permeability of disturbed coal seam. Liu et al (2011) probed into the deformation and stress relief characteristics of the high gas coal seam in Wulan Coal Mine, which revealed that the goaf under the coal seam had a buffer effect on protecting the coal seam, and its stress relief effect was obviously weakened.…”

Section: Introductionmentioning

confidence: 99%

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Evolution of mining stress field and the control technology of stress relief gas in close distance coal seam

Cheng

Zhao

et al. 2022

Energy Exploration & Exploitation

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The prevention and control of stress relief gas have crucial influence on safety of coal mine, it is not only the inevitable requirement of safe production, but also an effective way to realize reasonable utilization of gas. Taking the 1103 working face of the Weijiadi coal mine as the background, the mining stress field was analysed by means of numerical simulation, theoretical analysis and field practice, and the control technology of stress relief gas was studied. The results showed that scope of stress relief zone drops gradually associated with an increase of distance from the roof (or floor) to the working face. Additionally, the shape of the stress relief body exhibited a ring-shaped distribution, while four corners of the goaf roof and floor underwent high permeability zones due to a deep stress relief body, where the permeability of two corners near the transportation roadway of the floor was higher. The results provided good information for W-shaped ventilation mode with two inlets and one return which was adopted in the working face. More importantly, the optimized layout of boreholes was put forward, which eventually were useful for solving the gas overrun of the working face. The technology used in 1103 working face has an attractive and practical background with other extensive applications for the prevention and control of relief gas.

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Evolution of mining stress field and the control technology of stress relief gas in close distance coal seam

Cheng

Zhao

et al. 2022

Energy Exploration & Exploitation

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“…Therefore, gas extraction before coal mining is necessary [1][2][3][4]. Due to the low permeability of coal seams in some areas, permeability-increasing measures must be taken to improve gas extraction efficiency [5][6][7][8]. At present, hydraulic fracturing [9][10][11], hydraulic slotting [12], hydraulic flushing [13][14][15], and mechanical cutting assisted by water jet [16,17] have been applied in some mining areas.…”

Section: Introductionmentioning

confidence: 99%

Experimental Study on Hydraulic Fracturing of Laminated Sandstone Combined with Industrial CT and L-NMR

et al. 2022

Self Cite

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Hydraulic fracturing in the immediate roof is a suitable method to increase the permeability of soft outburst coal seam. In this work, the propagation law of hydraulic fractures in laminated virgin sandstone and the change of microstructure after hydraulic fracturing were revealed. The results show that the hydraulic fracturing pressure of sandstone with different bedding angles is 15.69~22.17 MPa. In the experiments, the hydraulic fractures extend through the bedding planes when the bedding angle is 45°. When the bedding angle is 0°, 15°, 30°, or 60°, the hydraulic fracture is prone to extend along a bedding plane. The hydraulic fracture in sandstone is jointly determined by the internal fractures and the cementation strengths of the bedding planes. The internal fractures may not necessarily guide the extension of the hydraulic fractures. The hydraulic fracturing pressures of the samples affected by the bedding plane and internal fractures are significantly lower than that of samples with uniform strength. Besides, hydraulic fracturing cannot change the connectivity between pores. The hydraulic fractures are the main channel for gas migration. The results can provide some guidance for the design and application of hydraulic fracturing in the immediate roof of the soft outburst coal seam.

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“…China is the world's largest coal consumer and has experienced the most serious coal and rock dynamic disasters [1,2], such as coal and gas outburst [3], rockburst [4], and roof fall [5]. Since the first rockburst occurred at the South Stafford coalfield in the United Kingdom in 1738, this catastrophic event has threatened almost all coal mining countries in the world over the past 283 years, including Poland [6], USA [7], Czech [8], France [9], and China [10].…”

Section: Introductionmentioning

confidence: 99%

Acoustic Emission and Fractal Precursory Characteristics of Coals with Different Bursting Liabilities in Loading Failure Process

Wang

et al. 2021

Shock and Vibration

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Aimed at investigating the differentiation of acoustic emission (AE) signals and fractal precursory characteristics between strong, weak, and no bursting liability coals under uniaxial compression, as well as improving the accuracy of rockburst monitoring and early warning by AE techniques, we experimentally studied the evolution law and differences of AE ring count rate, energy rate, and correlation dimension between different loaded bursting liability coals by the YAW4306 electric mechanical test system and CTA-1 AE monitor. Our experimental results indicated that the AE count and energy of coal samples with different bursting liabilities showed a similar evolution law of “sharp increase-calm-sharp increase” before their main rupture. The active points of AE signals emitted from coal with strong, weak, and no bursting liability appeared at about 85∼90%, 75∼78%, and 51∼55% of the peak stress, respectively. The stronger the bursting liability of coal, the shorter the duration of main rupture and postpeak failure stage, and the greater the AE energy rate in the main rupture. The AE counts of different coals had obvious fractal characteristics, and the AE correlation dimension values of strong and weak bursting liability coal samples presented the phenomenon of “fluctuating rise to a peak value-sharp drop-continuous decrease,” which can be used as a precursory information of coal failure.

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Uneven stress and permeability variation of mining-disturbed coal seam for targeted CBM drainage: A case study in Baode coal mine, eastern Ordos Basin, China

Cited by 74 publications

References 25 publications

Evolution of mining stress field and the control technology of stress relief gas in close distance coal seam

Evolution of mining stress field and the control technology of stress relief gas in close distance coal seam

Experimental Study on Hydraulic Fracturing of Laminated Sandstone Combined with Industrial CT and L-NMR

Acoustic Emission and Fractal Precursory Characteristics of Coals with Different Bursting Liabilities in Loading Failure Process

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