AI Article Synopsis
- The study highlights the significance of preparing appropriate coal specimens to acquire accurate mechanical and methane migration data for tectonic coal, which aids in methane extraction and disaster prevention.
- A dual-deformation mechanism for porous media was proposed, along with analyses of essential considerations in coal specimen preparation, emphasizing the relationship between bed relative density and applied stress through compression tests.
- Findings suggest that the Kawakita model effectively describes the compressive behavior of tectonic coal powders, with optimal preparation conditions identified at a compressive stress of 150 MPa.
Article Abstract
The preparation of suitable specimens is important for obtaining credible mechanical and methane migration parameters for tectonic coal, which help to guide methane extraction and disaster prevention. In this study, a dual-deformation mechanism for porous media was introduced along with two powder compression models, and the issues that should be considered in the preparation of coal specimens were analyzed. By compression tests, the relationship between bed relative density and the applied stress in the compression of coal particles was obtained. The method of coal specimen preparation was introduced in detail. The results indicated that the Kawakita model is suitable for describing the compressive process of tectonic coal powders and guiding the preparation of tectonic coal specimens. The key parameters and in the Kawakita model are 0.411 and 0.108, respectively. The bed relative density shows a slight increasing trend followed by an obvious rising tendency with an increase in the applied stress. A compressive stress of 150 MPa was determined to be suitable for preparation of the tested coal specimens.
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| http://www.ncbi.nlm.nih.gov/pmc/articles/PMC9066864 | PMC |
| http://dx.doi.org/10.1039/c9ra03861b | DOI Listing |
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