Effects of Acidic Environment on Dynamic Mechanical Properties and Porosity Evolution Characteristics of Coal
Coal pillars left in coal mines are often subjected to long-term submersion by groundwater and chemical solutions and are susceptible to deterioration and even destabilization damage under dynamic load disturbance. In order to investigate the effects of acidic environment on dynamic mechanical prope...
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| Main Authors: | , , , , , |
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| Format: | Article |
| Language: | English |
| Published: |
Wiley
2021-01-01
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| Series: | Shock and Vibration |
| Online Access: | http://dx.doi.org/10.1155/2021/1149550 |
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| _version_ | 1849410049197211648 |
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| author | Shuang Gong Xiaojun Li Wen Wang Shibin Yao Juan Liu Dengyun Niu |
| author_facet | Shuang Gong Xiaojun Li Wen Wang Shibin Yao Juan Liu Dengyun Niu |
| author_sort | Shuang Gong |
| collection | DOAJ |
| description | Coal pillars left in coal mines are often subjected to long-term submersion by groundwater and chemical solutions and are susceptible to deterioration and even destabilization damage under dynamic load disturbance. In order to investigate the effects of acidic environment on dynamic mechanical properties and porosity evolution characteristics of coal, a split Hopkinson bar (SHPB) was used to test the dynamic compressive strength and tensile strength of coal samples under different acid environment. The results showed that the sample density gradually decreased with the increase of the number of wet and dry cycles, but the decrease was significantly related to the pH value. Longitudinal wave velocity of coal sample decreases gradually with the increase of drying and wetting cycles, and the decreasing speed is first fast and then slow. The stronger the acidity of the solution, the more times the dry-wet cycle, and the higher the water absorption of the sample. In the early stage of dry-wet cycle, the coal is significantly affected, and the average deterioration degree is large. After that, the influence of cyclic action is reduced, and the average degradation degree is small. Porosity of coal increases continuously under the action of dry-wet cycle. The stronger the acidity, the greater the change in initial porosity. In the 20th cycle, the porosity of the acidic environment increases significantly at once and then decreases continuously. |
| format | Article |
| id | doaj-art-7d7ef107b6d8408481d6e858b5b413f8 |
| institution | Kabale University |
| issn | 1875-9203 |
| language | English |
| publishDate | 2021-01-01 |
| publisher | Wiley |
| record_format | Article |
| series | Shock and Vibration |
| spelling | doaj-art-7d7ef107b6d8408481d6e858b5b413f82025-08-20T03:35:18ZengWileyShock and Vibration1875-92032021-01-01202110.1155/2021/1149550Effects of Acidic Environment on Dynamic Mechanical Properties and Porosity Evolution Characteristics of CoalShuang Gong0Xiaojun Li1Wen Wang2Shibin Yao3Juan Liu4Dengyun Niu5School of Energy Science and EngineeringSchool of Energy Science and EngineeringSchool of Energy Science and EngineeringSchool of Energy Science and EngineeringSchool of Energy Science and EngineeringSchool of Energy Science and EngineeringCoal pillars left in coal mines are often subjected to long-term submersion by groundwater and chemical solutions and are susceptible to deterioration and even destabilization damage under dynamic load disturbance. In order to investigate the effects of acidic environment on dynamic mechanical properties and porosity evolution characteristics of coal, a split Hopkinson bar (SHPB) was used to test the dynamic compressive strength and tensile strength of coal samples under different acid environment. The results showed that the sample density gradually decreased with the increase of the number of wet and dry cycles, but the decrease was significantly related to the pH value. Longitudinal wave velocity of coal sample decreases gradually with the increase of drying and wetting cycles, and the decreasing speed is first fast and then slow. The stronger the acidity of the solution, the more times the dry-wet cycle, and the higher the water absorption of the sample. In the early stage of dry-wet cycle, the coal is significantly affected, and the average deterioration degree is large. After that, the influence of cyclic action is reduced, and the average degradation degree is small. Porosity of coal increases continuously under the action of dry-wet cycle. The stronger the acidity, the greater the change in initial porosity. In the 20th cycle, the porosity of the acidic environment increases significantly at once and then decreases continuously.http://dx.doi.org/10.1155/2021/1149550 |
| spellingShingle | Shuang Gong Xiaojun Li Wen Wang Shibin Yao Juan Liu Dengyun Niu Effects of Acidic Environment on Dynamic Mechanical Properties and Porosity Evolution Characteristics of Coal Shock and Vibration |
| title | Effects of Acidic Environment on Dynamic Mechanical Properties and Porosity Evolution Characteristics of Coal |
| title_full | Effects of Acidic Environment on Dynamic Mechanical Properties and Porosity Evolution Characteristics of Coal |
| title_fullStr | Effects of Acidic Environment on Dynamic Mechanical Properties and Porosity Evolution Characteristics of Coal |
| title_full_unstemmed | Effects of Acidic Environment on Dynamic Mechanical Properties and Porosity Evolution Characteristics of Coal |
| title_short | Effects of Acidic Environment on Dynamic Mechanical Properties and Porosity Evolution Characteristics of Coal |
| title_sort | effects of acidic environment on dynamic mechanical properties and porosity evolution characteristics of coal |
| url | http://dx.doi.org/10.1155/2021/1149550 |
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