The effect of anionic surfactant (SDS) on pore-fracture evolution of acidified coal and its significance for coalbed methane extraction

Guanhua, Ni; Xie, Heping; Li, Shang; Sun, Qing; Huang, Dongmei; Cheng, Yanying; Wang, Ning

doi:10.1016/j.apt.2019.02.008

Cited by 131 publications

(29 citation statements)

References 45 publications

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“…The control parameters of strength mainly include cohesive force and internal friction angle depending on Equation (7). However, the influence of internal friction angle can be almost ignored, 64 and strength of coal is supervised by the cohesive force.…”

Section: Failure Criterion Equationmentioning

confidence: 99%

“…As an associated product of coal, CBM is not only the major hazards in coal mine, and it is also a kind of greenhouse gases; of which, the global warming potential is 25 times more than that of carbon dioxide. Additionally, CBM is a valuable clean energy, so the United States, Russia, Canada, Australia, and many other countries begin to develop CBM resources. Therefore, how to extract gas safely and efficiently has become the demand for safety, economy, and environment of coal mine in China …”

Section: Introductionmentioning

confidence: 99%

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Damage‐induced permeability model of coal and its application to gas predrainage in combination of soft coal and hard coal

Zhang

et al. 2019

Energy Science & Engineering

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Coal permeability is a key parameter that affects the drainage of coal bed methane (CBM). Owing to the lower original permeability of coal seams in China, more attention was paid to the study of damage‐induced permeability laws. However, the theory of damage‐induced permeability still needs to be improved. In this paper, the permeability evolution experiments during the complete stress–strain process of coal were carried out firstly. The results are shown that with the increase in axial strain, the coal permeability decreases slowly at first, then increases rapidly, and finally increases slowly or even remains unchanged, and the peak stress point can be regarded as the extreme point of permeability. Then, the equivalent plastic strain was used to describe the damage of coal. Based on the above results, a new damage‐induced permeability model was developed, and the new model can match the experimental data of permeability very well. In addition, solid–gas coupling models of coal were developed based on the new permeability model, and the numerical results show that there is a region of sudden increase in permeability around the borehole where plastic failure occurs, which indicates that the damage‐induced permeability model is reasonable. Finally, the results of numerical simulation of gas predrainage in combination of soft coal and hard coal under different cases were used to optimize the borehole layout of gas predrainage in the field.

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Section: Failure Criterion Equationmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Damage‐induced permeability model of coal and its application to gas predrainage in combination of soft coal and hard coal

Zhang

et al. 2019

Energy Science & Engineering

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“…is research can provide a theoretical basis for shotcrete in mine. High quality wet-mix shotcrete with PET fiber can effectively reduce mine disasters, such as dust and roof accidents [78][79][80][81][82][83][84][85][86][87][88][89][90][91][92][93][94][95].…”

Section: Relationship Between Shootability and Mechanicalmentioning

confidence: 99%

Effects of PET Fibers on Pumpability, Shootability, and Mechanical Properties of Wet‐Mix Shotcrete

Cui

Liu

Wang

et al. 2019

Advances in Civil Engineering

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Polyethylene terephthalate (PET) fiber from waste plastic bottles is an environmentally friendly fiber that can improve the mechanical properties of wet-mix shotcrete. The main objective of this paper is to investigate the effects of PET fiber parameters on pumpability, shootability, and mechanical properties of wet-mix shotcrete. For this purpose, the orthogonal test based on three factors and three levels was conducted. The width, length, and content of PET fiber were selected as the experimental variables. The tests of wet-mix shotcrete reinforced by PET fibers were carried out, along with properties tests such as slump, pressure drop, build-up thickness, compressive strength, and splitting strength. The results showed the change trend of shotcrete performances with increasing PET fiber parameters (width, length, and content). According to the orthogonal test, PET fiber parameters were determined (1 mm width, 20 mm length, and 5 kg/m3 content). Furthermore, relationships between slump and pumpability and shootability were explored, as well as the relationships between pumpability, shootability, and mechanical properties. It was found that pressure drop and compressive strength had the strongest negative linear relationship among all fitting relationships. We hoped that this study could contribute the useful information for the application of wet-mix shotcrete mixed with PET fibers.

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“…In addition, dame sheets should be arranged outside the block wall and at the corner of the transportation roadway and the ventilation roadway of working face #10414. The anchor cable parts should be removed to fully cave the top coal at the corner of the roadway, reduce air leakage, and prevent heat accumulation (Figure ) …”

Section: Discussionmentioning

confidence: 99%

“…The anchor cable parts should be removed to fully cave the top coal at the corner of the roadway, reduce air leakage, and prevent heat accumulation ( Figure 9). [49][50][51][52][53][54] 6 | CONCLUSIONS In this paper, for the situation where the roof caving strength in a deep coal seam mine is relatively high, we analyze the relationship between the LDRC and CSC in the gob. In addition, we present a calculation model for CSC based on porosity and use working face #10414 in the Yangliu coal mine as an example to verify the correctness of the ASM.…”

Section: Suggestions For Fire Prevention and Extinguishing In The Minementioning

confidence: 99%

Study of the influence of the characteristics of loose residual coal on the spontaneous combustion of coal gob

Shu

et al. 2019

Energy Science & Engineering

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Mine fires are becoming a serious issue as the intensity of mining increases, especially in deep mines. Loose coal gob has a hidden ignition location and a high possibility of spontaneous combustion, which makes fire prevention difficult. Therefore, based on the theory of gas seepage and the characteristics of loose coal, a model of air leakage and spontaneous combustion in gob is established in this paper. Using working face #10414 in the Yangliu coal mine as an example, the relationship between the three spontaneous coal combustion (CSC) zones and the three stress zones is analyzed and verified by combining a FLAC3D simulation with field monitoring. In addition, the influence of advancing speed on the CSC is discussed, and suggestions for fire prevention are presented. The results show that the variation in the calorific value of the CSC with increasing degree of looseness of the residual coal in the gob forms an arch‐shape. There is a one‐to‐one relationship between the distribution of the three stress zones and the three CSC zones. In addition, as the advancing speed increases, the contact time between the loose coal body and the air decreases and the possibility of CSC decreases. This study provides a scientific basis for fire prevention and control in mines.

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The effect of anionic surfactant (SDS) on pore-fracture evolution of acidified coal and its significance for coalbed methane extraction

Cited by 131 publications

References 45 publications

Damage‐induced permeability model of coal and its application to gas predrainage in combination of soft coal and hard coal

Damage‐induced permeability model of coal and its application to gas predrainage in combination of soft coal and hard coal

Effects of PET Fibers on Pumpability, Shootability, and Mechanical Properties of Wet‐Mix Shotcrete

Study of the influence of the characteristics of loose residual coal on the spontaneous combustion of coal gob

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