Issue |
E3S Web Conf.
Volume 518, 2024
9th International Conference on Energy Science and Applied Technology (ESAT 2024)
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Article Number | 01008 | |
Number of page(s) | 4 | |
DOI | https://doi.org/10.1051/e3sconf/202451801008 | |
Published online | 17 April 2024 |
Experimental study on the influence of coal soaking pressure on saturated water content and effective porosity
China Coal Technology and Engineering Group Chongqing Research Institute, Chongqing, China
* Corresponding author: my-cafe@163.com
This article takes the main mining of coal seam 2# in Yulin mining area of northern Shaanxi as the background, uses true density and apparent density testing methods to obtain the total porosity of coal, and uses a pressurized saturation test device and a pressurized soaking method to obtain the saturated water content and soaking pressure change law of coal under the soaking pressure condition of 0~10MPa. At the same time, the mathematical relationship between saturated water content and effective porosity is used, Revealed the influence of soaking pressure on the effective porosity and proportion of coal samples. The experimental results show that the saturated water content of coal is related to the pressure of the aqueous solution. The saturated water content increases with the increase of soaking pressure. Under the pressure condition of 0~4MPa, the water content increases rapidly. When the soaking pressure reaches 8MPa, the saturated water content gradually stabilizes at around 5.8%; The effective porosity and the proportion of effective porosity of coal samples increase with the increase of soaking pressure. When the soaking pressure increases from 0 MPa to 6MPa, the effective porosity increases rapidly, and the proportion of effective porosity increases by 17%; After the soaking pressure increased to 8 MPa, the effective porosity gradually stabilized at around 7.3%, at which point the proportion of effective porosity reached 78.79%, an increase of about 18%; Increasing the soaking pressure can force water molecules to enter more pores in the coal body, shorten the time for water molecules to enter pores and cracks, increase the proportion of effective porosity in coal, and have a good effect on increasing permeability and wetting of the coal body. It can provide guidance and support for the application of coal seam water injection and dust reduction engineering.
© The Authors, published by EDP Sciences, 2024
This is an Open Access article distributed under the terms of the Creative Commons Attribution License 4.0, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
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