Influence of coupled effect among flaw parameters on strength characteristic of precracked specimen: Application of response surface methodology and fractal method

Liu, Ting, Lin, Baiquan, Zheng, Chunshan, Zou, Quanle, Zhu, Chuanjie and Yan, Fazhi (2015) Influence of coupled effect among flaw parameters on strength characteristic of precracked specimen: Application of response surface methodology and fractal method. Journal of Natural Gas Science and Engineering, 26 857-866. doi:10.1016/j.jngse.2015.07.021

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Author Liu, Ting
Lin, Baiquan
Zheng, Chunshan
Zou, Quanle
Zhu, Chuanjie
Yan, Fazhi
Title Influence of coupled effect among flaw parameters on strength characteristic of precracked specimen: Application of response surface methodology and fractal method
Journal name Journal of Natural Gas Science and Engineering   Check publisher's open access policy
ISSN 1875-5100
2212-3865
Publication date 2015-09-01
Year available 2015
Sub-type Article (original research)
DOI 10.1016/j.jngse.2015.07.021
Open Access Status File (Author Post-print)
Volume 26
Start page 857
End page 866
Total pages 10
Place of publication Philadelphia, United States
Publisher Elsevier
Collection year 2015
Language eng
Abstract Hydraulic slotting is an effective method for enhanced coalbed methane (ECBM) recovery, and it has been widely employed in China. Although there have been many studies of this technique, the influence of slot parameters on the strength characteristic of the coal, which is an important factor that affects the permeability enhancement effect, has rarely been studied. Thus, only limited information is available regarding the pressure relief and permeability enhancement mechanisms of this technique. In the current study, the influence of flaw parameters on the compressive strength of a precracked sample under biaxial compression is discussed. The results indicate that an increase in the flaw length and width has a negative effect on the compressive strength, whereas an increase in the flaw inclination angle has a positive effect on the compressive strength. The results of the response surface methodology (RSM) indicate that the interactions among the flaw parameters have a significant influence on the compressive strength. The propagation patterns of cracks are quantified by the fractal dimension, which is used to explore the mechanism of compressive strength variation with changes in the flaw parameters. The study results indicate that the variation in the flaw parameters changes the propagation pattern of cracks, resulting in different compressive strengths. In addition, an opposite variation trend of the compressive strength and fractal dimension with flaw parameters is also observed. The research results are expected to guide the field application of hydraulic slotting.
Keyword Compressive strength
Hydraulic slotting
Flaw parameters
RSM
Fractal dimension
Q-Index Code C1
Q-Index Status Confirmed Code
Institutional Status UQ

Document type: Journal Article
Sub-type: Article (original research)
Collections: School of Mechanical & Mining Engineering Publications
Official 2016 Collection
 
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Citation counts: TR Web of Science Citation Count  Cited 7 times in Thomson Reuters Web of Science Article | Citations
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