Experimental Study on Mechanical Properties and Seepage Laws of Raw Coal under Variable Loading and Unloading Rates
This manuscript studied the effects of variable axial pressure loading rate and variable confining pressure unloading rate on the deformation behavior and seepage characteristics of raw coal under alternate loading and unloading of axial pressure and confining pressure. It believed that as axial str...
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| Main Authors: | , , , |
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| Format: | Article |
| Language: | English |
| Published: |
Wiley
2021-01-01
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| Series: | Geofluids |
| Online Access: | http://dx.doi.org/10.1155/2021/5596858 |
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| _version_ | 1832560631286333440 |
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| author | Kangwu Feng Kequan Wang Dongming Zhang Yushun Yang |
| author_facet | Kangwu Feng Kequan Wang Dongming Zhang Yushun Yang |
| author_sort | Kangwu Feng |
| collection | DOAJ |
| description | This manuscript studied the effects of variable axial pressure loading rate and variable confining pressure unloading rate on the deformation behavior and seepage characteristics of raw coal under alternate loading and unloading of axial pressure and confining pressure. It believed that as axial stress increases, axial strain ε1 decreases, radial strain ε3 increases, and permeability k decreases, and ε1′, ε3′, and k′ increase when confining pressure is decreases. With the loading of axial stress and the unloading of confining pressure, the variation amplitudes of ε1′, ε3′, and k′ values reduce gradually. During axial stress loading, the rise in the amplitude of ε1 is larger than that of ε3 and the reduction in the amplitude of k, indicating that ε1 is more sensitive to axial stress than ε3 and k. During unloading of confining pressure, the increase rate of ε3 is larger than that of ε1 and k; also, ε3 showed a high sensitivity to confining pressure. In the stage of axial stress loading and confining pressure unloading, the evolution law of deformation and permeability parameters is basically consistent with the change in loading and unloading rate. |
| format | Article |
| id | doaj-art-e08cba8fd6d04cc0a2da5bd65fe17335 |
| institution | Kabale University |
| issn | 1468-8115 1468-8123 |
| language | English |
| publishDate | 2021-01-01 |
| publisher | Wiley |
| record_format | Article |
| series | Geofluids |
| spelling | doaj-art-e08cba8fd6d04cc0a2da5bd65fe173352025-02-03T01:27:07ZengWileyGeofluids1468-81151468-81232021-01-01202110.1155/2021/55968585596858Experimental Study on Mechanical Properties and Seepage Laws of Raw Coal under Variable Loading and Unloading RatesKangwu Feng0Kequan Wang1Dongming Zhang2Yushun Yang3School of Resources and Safety Engineering, Chongqing University, Chongqing 400044, ChinaChongqing Institute of China Coal Research Institute, Chongqing 400037, ChinaSchool of Resources and Safety Engineering, Chongqing University, Chongqing 400044, ChinaFaculty of Architecture and Civil Engineering, Huaiyin Institute of Technology, Huai’an 223001, ChinaThis manuscript studied the effects of variable axial pressure loading rate and variable confining pressure unloading rate on the deformation behavior and seepage characteristics of raw coal under alternate loading and unloading of axial pressure and confining pressure. It believed that as axial stress increases, axial strain ε1 decreases, radial strain ε3 increases, and permeability k decreases, and ε1′, ε3′, and k′ increase when confining pressure is decreases. With the loading of axial stress and the unloading of confining pressure, the variation amplitudes of ε1′, ε3′, and k′ values reduce gradually. During axial stress loading, the rise in the amplitude of ε1 is larger than that of ε3 and the reduction in the amplitude of k, indicating that ε1 is more sensitive to axial stress than ε3 and k. During unloading of confining pressure, the increase rate of ε3 is larger than that of ε1 and k; also, ε3 showed a high sensitivity to confining pressure. In the stage of axial stress loading and confining pressure unloading, the evolution law of deformation and permeability parameters is basically consistent with the change in loading and unloading rate.http://dx.doi.org/10.1155/2021/5596858 |
| spellingShingle | Kangwu Feng Kequan Wang Dongming Zhang Yushun Yang Experimental Study on Mechanical Properties and Seepage Laws of Raw Coal under Variable Loading and Unloading Rates Geofluids |
| title | Experimental Study on Mechanical Properties and Seepage Laws of Raw Coal under Variable Loading and Unloading Rates |
| title_full | Experimental Study on Mechanical Properties and Seepage Laws of Raw Coal under Variable Loading and Unloading Rates |
| title_fullStr | Experimental Study on Mechanical Properties and Seepage Laws of Raw Coal under Variable Loading and Unloading Rates |
| title_full_unstemmed | Experimental Study on Mechanical Properties and Seepage Laws of Raw Coal under Variable Loading and Unloading Rates |
| title_short | Experimental Study on Mechanical Properties and Seepage Laws of Raw Coal under Variable Loading and Unloading Rates |
| title_sort | experimental study on mechanical properties and seepage laws of raw coal under variable loading and unloading rates |
| url | http://dx.doi.org/10.1155/2021/5596858 |
| work_keys_str_mv | AT kangwufeng experimentalstudyonmechanicalpropertiesandseepagelawsofrawcoalundervariableloadingandunloadingrates AT kequanwang experimentalstudyonmechanicalpropertiesandseepagelawsofrawcoalundervariableloadingandunloadingrates AT dongmingzhang experimentalstudyonmechanicalpropertiesandseepagelawsofrawcoalundervariableloadingandunloadingrates AT yushunyang experimentalstudyonmechanicalpropertiesandseepagelawsofrawcoalundervariableloadingandunloadingrates |