Experimental research on compressive strength deterioration of coal seam floor sandstone under the action of acidic mine drainage
Abstract In sulphur-coal symbiotic coal seams, after the mining of sulphide iron ore, when the coal resources are mined, the mine water accumulated in the roadway mining area will have a certain impact on the stability of the surrounding rock of the coal seam roadway. Taking the floor sandstone of s...
| Main Authors: | , , , , , |
|---|---|
| Format: | Article |
| Language: | English |
| Published: |
Nature Portfolio
2024-02-01
|
| Series: | Scientific Reports |
| Subjects: | |
| Online Access: | https://doi.org/10.1038/s41598-024-55361-6 |
| _version_ | 1797274804634517504 |
|---|---|
| author | Wenmei Han Zhaoying Chen Hongtai Liu Xiang Zheng Jinwen Wu Qi Yuan |
| author_facet | Wenmei Han Zhaoying Chen Hongtai Liu Xiang Zheng Jinwen Wu Qi Yuan |
| author_sort | Wenmei Han |
| collection | DOAJ |
| description | Abstract In sulphur-coal symbiotic coal seams, after the mining of sulphide iron ore, when the coal resources are mined, the mine water accumulated in the roadway mining area will have a certain impact on the stability of the surrounding rock of the coal seam roadway. Taking the floor sandstone of sulfur coal symbiotic coal seam as the research object, the roof fissure water with pH values of 7.48, 4.81 and 2.62 was used as the experimental solution. 10 experimental schemes were designed to measure the compressive strength of the samples under the action of AMD, and the hydrochemical analysis of AMD was conducted. The pore structures of the samples before and after the action of AMD were analyzed. Based on the hydrochemistry and pore structure, the deterioration mechanism of compressive strength of the coal seam floor sandstone under the action of AMD was explained. The results indicated that the compressive strength of the samples decreased with the increasing action time of AMD. The compressive strength decreased with the increment of the porosity. The concentration of H+ ion in AMD was relatively small. Na2O in albite dissolved and reacted with water, leading to an increase in the concentration of Na+ ion. Soluble substances such as MgCl2 and CaSO4 in the pore structure dissolved, leading to an increase in the concentration of Ca2+ and Mg2+ ions. The dissolution of soluble substances and the physical–chemical reactions between solutions and minerals were the essential causes of the continuous deterioration of the compressive strength of the coal seam floor sandstone. The results of this study can provide a theoretical basis for the deterioration of the mechanical properties of the peripheral rock in the roadway of the sulphur coal seam, and can also provide a certain engineering reference for the sulphur coal seam roadway. |
| first_indexed | 2024-03-07T15:03:17Z |
| format | Article |
| id | doaj.art-5659e379f7da46ffac2b73c08987b648 |
| institution | Directory Open Access Journal |
| issn | 2045-2322 |
| language | English |
| last_indexed | 2024-03-07T15:03:17Z |
| publishDate | 2024-02-01 |
| publisher | Nature Portfolio |
| record_format | Article |
| series | Scientific Reports |
| spelling | doaj.art-5659e379f7da46ffac2b73c08987b6482024-03-05T19:00:19ZengNature PortfolioScientific Reports2045-23222024-02-0114111010.1038/s41598-024-55361-6Experimental research on compressive strength deterioration of coal seam floor sandstone under the action of acidic mine drainageWenmei Han0Zhaoying Chen1Hongtai Liu2Xiang Zheng3Jinwen Wu4Qi Yuan5Department of Engineering Mechanics, North University of ChinaState Key Laboratory of Coal and CBM Co-MiningState Key Laboratory of Coal and CBM Co-MiningDepartment of Engineering Mechanics, North University of ChinaDepartment of Engineering Mechanics, North University of ChinaDepartment of Engineering Mechanics, North University of ChinaAbstract In sulphur-coal symbiotic coal seams, after the mining of sulphide iron ore, when the coal resources are mined, the mine water accumulated in the roadway mining area will have a certain impact on the stability of the surrounding rock of the coal seam roadway. Taking the floor sandstone of sulfur coal symbiotic coal seam as the research object, the roof fissure water with pH values of 7.48, 4.81 and 2.62 was used as the experimental solution. 10 experimental schemes were designed to measure the compressive strength of the samples under the action of AMD, and the hydrochemical analysis of AMD was conducted. The pore structures of the samples before and after the action of AMD were analyzed. Based on the hydrochemistry and pore structure, the deterioration mechanism of compressive strength of the coal seam floor sandstone under the action of AMD was explained. The results indicated that the compressive strength of the samples decreased with the increasing action time of AMD. The compressive strength decreased with the increment of the porosity. The concentration of H+ ion in AMD was relatively small. Na2O in albite dissolved and reacted with water, leading to an increase in the concentration of Na+ ion. Soluble substances such as MgCl2 and CaSO4 in the pore structure dissolved, leading to an increase in the concentration of Ca2+ and Mg2+ ions. The dissolution of soluble substances and the physical–chemical reactions between solutions and minerals were the essential causes of the continuous deterioration of the compressive strength of the coal seam floor sandstone. The results of this study can provide a theoretical basis for the deterioration of the mechanical properties of the peripheral rock in the roadway of the sulphur coal seam, and can also provide a certain engineering reference for the sulphur coal seam roadway.https://doi.org/10.1038/s41598-024-55361-6Coal seam floor sandstoneAcidic mine drainageCompressive strengthHydrochemistryPore structure |
| spellingShingle | Wenmei Han Zhaoying Chen Hongtai Liu Xiang Zheng Jinwen Wu Qi Yuan Experimental research on compressive strength deterioration of coal seam floor sandstone under the action of acidic mine drainage Scientific Reports Coal seam floor sandstone Acidic mine drainage Compressive strength Hydrochemistry Pore structure |
| title | Experimental research on compressive strength deterioration of coal seam floor sandstone under the action of acidic mine drainage |
| title_full | Experimental research on compressive strength deterioration of coal seam floor sandstone under the action of acidic mine drainage |
| title_fullStr | Experimental research on compressive strength deterioration of coal seam floor sandstone under the action of acidic mine drainage |
| title_full_unstemmed | Experimental research on compressive strength deterioration of coal seam floor sandstone under the action of acidic mine drainage |
| title_short | Experimental research on compressive strength deterioration of coal seam floor sandstone under the action of acidic mine drainage |
| title_sort | experimental research on compressive strength deterioration of coal seam floor sandstone under the action of acidic mine drainage |
| topic | Coal seam floor sandstone Acidic mine drainage Compressive strength Hydrochemistry Pore structure |
| url | https://doi.org/10.1038/s41598-024-55361-6 |
| work_keys_str_mv | AT wenmeihan experimentalresearchoncompressivestrengthdeteriorationofcoalseamfloorsandstoneundertheactionofacidicminedrainage AT zhaoyingchen experimentalresearchoncompressivestrengthdeteriorationofcoalseamfloorsandstoneundertheactionofacidicminedrainage AT hongtailiu experimentalresearchoncompressivestrengthdeteriorationofcoalseamfloorsandstoneundertheactionofacidicminedrainage AT xiangzheng experimentalresearchoncompressivestrengthdeteriorationofcoalseamfloorsandstoneundertheactionofacidicminedrainage AT jinwenwu experimentalresearchoncompressivestrengthdeteriorationofcoalseamfloorsandstoneundertheactionofacidicminedrainage AT qiyuan experimentalresearchoncompressivestrengthdeteriorationofcoalseamfloorsandstoneundertheactionofacidicminedrainage |