Nanoscale rock mechanical property changes in heterogeneous coal after water adsorption
© 2018 Elsevier Ltd Rock mechanical properties are of key importance in coal mining exploration, coal bed methane production and CO 2 storage in deep unmineable coal seams; accurate data is required so that geohazards (e.g. layer collapse or methane/CO 2 leakage) can be avoided. In this context it i...
| Main Authors: | , , , , , , , |
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| Format: | Journal Article |
| Published: |
Elsevier Ltd
2018
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| Online Access: | http://hdl.handle.net/20.500.11937/65799 |
| _version_ | 1848761206278455296 |
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| author | Zhang, Y. Lebedev, Maxim Al-Yaseri, A. Yu, H. Xu, X. Sarmadivaleh, Mohammad Barifcani, Ahmed Iglauer, Stefan |
| author_facet | Zhang, Y. Lebedev, Maxim Al-Yaseri, A. Yu, H. Xu, X. Sarmadivaleh, Mohammad Barifcani, Ahmed Iglauer, Stefan |
| author_sort | Zhang, Y. |
| building | Curtin Institutional Repository |
| collection | Online Access |
| description | © 2018 Elsevier Ltd Rock mechanical properties are of key importance in coal mining exploration, coal bed methane production and CO 2 storage in deep unmineable coal seams; accurate data is required so that geohazards (e.g. layer collapse or methane/CO 2 leakage) can be avoided. In this context it is well established that coal matrix swelling due to water adsorption significantly changes the coal microstructure. However, how water adsorption and the associated with microstructural changes affect the mechanical properties is only poorly understood, despite the fact that micro-scale mechanical properties determine the overall geo-mechanical response as failure initiates at the weakest point. Thus, we measured nanoscale rock mechanical properties via nanoindentation tests and compared the results with traditional acoustic methods on heterogeneous medium rank coal samples in both dry and brine saturated conditions. The microscale heterogeneity of the rock mechanical properties was mapped and compared with the morphology of the sample (measured by SEM and microCT). While the nanoindentation tests measured decreasing indentation moduli after water adsorption (-60% to -66%), the traditional acoustic tests measured an increase (+17%). We concluded that acoustic tests failed to capture the accurate rock mechanical properties changes for the heterogeneous coal during water adsorption. It is thus necessary to measure the coal rock mechanical properties at the microscale to obtain more accurate data and reduce the risk of geohazards. |
| first_indexed | 2025-11-14T10:27:59Z |
| format | Journal Article |
| id | curtin-20.500.11937-65799 |
| institution | Curtin University Malaysia |
| institution_category | Local University |
| last_indexed | 2025-11-14T10:27:59Z |
| publishDate | 2018 |
| publisher | Elsevier Ltd |
| recordtype | eprints |
| repository_type | Digital Repository |
| spelling | curtin-20.500.11937-657992018-02-19T08:06:30Z Nanoscale rock mechanical property changes in heterogeneous coal after water adsorption Zhang, Y. Lebedev, Maxim Al-Yaseri, A. Yu, H. Xu, X. Sarmadivaleh, Mohammad Barifcani, Ahmed Iglauer, Stefan © 2018 Elsevier Ltd Rock mechanical properties are of key importance in coal mining exploration, coal bed methane production and CO 2 storage in deep unmineable coal seams; accurate data is required so that geohazards (e.g. layer collapse or methane/CO 2 leakage) can be avoided. In this context it is well established that coal matrix swelling due to water adsorption significantly changes the coal microstructure. However, how water adsorption and the associated with microstructural changes affect the mechanical properties is only poorly understood, despite the fact that micro-scale mechanical properties determine the overall geo-mechanical response as failure initiates at the weakest point. Thus, we measured nanoscale rock mechanical properties via nanoindentation tests and compared the results with traditional acoustic methods on heterogeneous medium rank coal samples in both dry and brine saturated conditions. The microscale heterogeneity of the rock mechanical properties was mapped and compared with the morphology of the sample (measured by SEM and microCT). While the nanoindentation tests measured decreasing indentation moduli after water adsorption (-60% to -66%), the traditional acoustic tests measured an increase (+17%). We concluded that acoustic tests failed to capture the accurate rock mechanical properties changes for the heterogeneous coal during water adsorption. It is thus necessary to measure the coal rock mechanical properties at the microscale to obtain more accurate data and reduce the risk of geohazards. 2018 Journal Article http://hdl.handle.net/20.500.11937/65799 10.1016/j.fuel.2018.01.006 Elsevier Ltd restricted |
| spellingShingle | Zhang, Y. Lebedev, Maxim Al-Yaseri, A. Yu, H. Xu, X. Sarmadivaleh, Mohammad Barifcani, Ahmed Iglauer, Stefan Nanoscale rock mechanical property changes in heterogeneous coal after water adsorption |
| title | Nanoscale rock mechanical property changes in heterogeneous coal after water adsorption |
| title_full | Nanoscale rock mechanical property changes in heterogeneous coal after water adsorption |
| title_fullStr | Nanoscale rock mechanical property changes in heterogeneous coal after water adsorption |
| title_full_unstemmed | Nanoscale rock mechanical property changes in heterogeneous coal after water adsorption |
| title_short | Nanoscale rock mechanical property changes in heterogeneous coal after water adsorption |
| title_sort | nanoscale rock mechanical property changes in heterogeneous coal after water adsorption |
| url | http://hdl.handle.net/20.500.11937/65799 |