Study on Failure Modes and Energy Evolution of Coal-Rock Combination under Cyclic Loading
The loading modes and roof lithology have a significant influence on the mechanical properties of coal seams. To reveal the failure modes and energy evolution law of underground coal during the mining process, conventional uniaxial and uniaxial cyclic loading tests were carried out on three types of...
Saved in:
| Main Authors: | , , , , , |
|---|---|
| Format: | Article |
| Language: | English |
| Published: |
Wiley
2020-01-01
|
| Series: | Shock and Vibration |
| Online Access: | http://dx.doi.org/10.1155/2020/5731721 |
| Tags: |
Add Tag
No Tags, Be the first to tag this record!
|
| _version_ | 1832567409814274048 |
|---|---|
| author | Shilin Song Xuesheng Liu Yunliang Tan Deyuan Fan Qing Ma Honglei Wang |
| author_facet | Shilin Song Xuesheng Liu Yunliang Tan Deyuan Fan Qing Ma Honglei Wang |
| author_sort | Shilin Song |
| collection | DOAJ |
| description | The loading modes and roof lithology have a significant influence on the mechanical properties of coal seams. To reveal the failure modes and energy evolution law of underground coal during the mining process, conventional uniaxial and uniaxial cyclic loading tests were carried out on three types of samples: coal, rock, and coal-rock combinations. The results show that the samples mainly behave with three failure modes (shear slip, tensile splitting, and fracture), and all the coal sections in the coal-rock combinations fail, whereas most rock sections remain intact. The compressive strength of the coal-rock combination is higher than coal and much smaller than rock. Compared with the conventional uniaxial loading condition, both the maximum deformation before failure and Young’s modulus under the cyclic loading condition are greater, and the latter increases quadratically with the cycle index. The energy densities are also calculated, and their variations are analysed in detail. The results show that with increasing cycle index, both the elastic energy stored in the sample and the dissipated energy increase in a quadratic function, and the failure process becomes more intense. This research reveals the failure modes, deformation characteristics, and energy evolution of the coal-rock combination under different loading conditions, which can provide strong support for controlling underground surrounding rocks of the coal face and roadway in coalmines. |
| format | Article |
| id | doaj-art-e0f12a9161e84672bb18ea7b8add2818 |
| institution | Kabale University |
| issn | 1070-9622 1875-9203 |
| language | English |
| publishDate | 2020-01-01 |
| publisher | Wiley |
| record_format | Article |
| series | Shock and Vibration |
| spelling | doaj-art-e0f12a9161e84672bb18ea7b8add28182025-02-03T01:01:36ZengWileyShock and Vibration1070-96221875-92032020-01-01202010.1155/2020/57317215731721Study on Failure Modes and Energy Evolution of Coal-Rock Combination under Cyclic LoadingShilin Song0Xuesheng Liu1Yunliang Tan2Deyuan Fan3Qing Ma4Honglei Wang5State Key Laboratory of Mining Disaster Prevention and Control Co-Founded by Shandong Province and the Ministry of Science and Technology, Shandong University of Science and Technology, Qingdao 266590, ChinaState Key Laboratory of Mining Disaster Prevention and Control Co-Founded by Shandong Province and the Ministry of Science and Technology, Shandong University of Science and Technology, Qingdao 266590, ChinaState Key Laboratory of Mining Disaster Prevention and Control Co-Founded by Shandong Province and the Ministry of Science and Technology, Shandong University of Science and Technology, Qingdao 266590, ChinaState Key Laboratory of Mining Disaster Prevention and Control Co-Founded by Shandong Province and the Ministry of Science and Technology, Shandong University of Science and Technology, Qingdao 266590, ChinaState Key Laboratory of Mining Disaster Prevention and Control Co-Founded by Shandong Province and the Ministry of Science and Technology, Shandong University of Science and Technology, Qingdao 266590, ChinaState Key Laboratory of Mining Disaster Prevention and Control Co-Founded by Shandong Province and the Ministry of Science and Technology, Shandong University of Science and Technology, Qingdao 266590, ChinaThe loading modes and roof lithology have a significant influence on the mechanical properties of coal seams. To reveal the failure modes and energy evolution law of underground coal during the mining process, conventional uniaxial and uniaxial cyclic loading tests were carried out on three types of samples: coal, rock, and coal-rock combinations. The results show that the samples mainly behave with three failure modes (shear slip, tensile splitting, and fracture), and all the coal sections in the coal-rock combinations fail, whereas most rock sections remain intact. The compressive strength of the coal-rock combination is higher than coal and much smaller than rock. Compared with the conventional uniaxial loading condition, both the maximum deformation before failure and Young’s modulus under the cyclic loading condition are greater, and the latter increases quadratically with the cycle index. The energy densities are also calculated, and their variations are analysed in detail. The results show that with increasing cycle index, both the elastic energy stored in the sample and the dissipated energy increase in a quadratic function, and the failure process becomes more intense. This research reveals the failure modes, deformation characteristics, and energy evolution of the coal-rock combination under different loading conditions, which can provide strong support for controlling underground surrounding rocks of the coal face and roadway in coalmines.http://dx.doi.org/10.1155/2020/5731721 |
| spellingShingle | Shilin Song Xuesheng Liu Yunliang Tan Deyuan Fan Qing Ma Honglei Wang Study on Failure Modes and Energy Evolution of Coal-Rock Combination under Cyclic Loading Shock and Vibration |
| title | Study on Failure Modes and Energy Evolution of Coal-Rock Combination under Cyclic Loading |
| title_full | Study on Failure Modes and Energy Evolution of Coal-Rock Combination under Cyclic Loading |
| title_fullStr | Study on Failure Modes and Energy Evolution of Coal-Rock Combination under Cyclic Loading |
| title_full_unstemmed | Study on Failure Modes and Energy Evolution of Coal-Rock Combination under Cyclic Loading |
| title_short | Study on Failure Modes and Energy Evolution of Coal-Rock Combination under Cyclic Loading |
| title_sort | study on failure modes and energy evolution of coal rock combination under cyclic loading |
| url | http://dx.doi.org/10.1155/2020/5731721 |
| work_keys_str_mv | AT shilinsong studyonfailuremodesandenergyevolutionofcoalrockcombinationundercyclicloading AT xueshengliu studyonfailuremodesandenergyevolutionofcoalrockcombinationundercyclicloading AT yunliangtan studyonfailuremodesandenergyevolutionofcoalrockcombinationundercyclicloading AT deyuanfan studyonfailuremodesandenergyevolutionofcoalrockcombinationundercyclicloading AT qingma studyonfailuremodesandenergyevolutionofcoalrockcombinationundercyclicloading AT hongleiwang studyonfailuremodesandenergyevolutionofcoalrockcombinationundercyclicloading |