Destruction Law of Borehole Surrounding Rock of Granite under Thermo-Hydro-Mechanical Coupling
The destruction of the rock that surrounds boreholes under thermo-hydro-mechanical coupling is an important factor for borehole stability in hot dry rock (HDR) geothermal energy extraction. Failure experiments for granite under triaxial stress (σ1>σ2>σ3) were conducted as 500°C superheated ste...
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| Format: | Article |
| Language: | English |
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Wiley
2020-01-01
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| Series: | Geofluids |
| Online Access: | http://dx.doi.org/10.1155/2020/6627616 |
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| author | Jinwen Wu Zijun Feng Shuping Chen Wenmei Han |
| author_facet | Jinwen Wu Zijun Feng Shuping Chen Wenmei Han |
| author_sort | Jinwen Wu |
| collection | DOAJ |
| description | The destruction of the rock that surrounds boreholes under thermo-hydro-mechanical coupling is an important factor for borehole stability in hot dry rock (HDR) geothermal energy extraction. Failure experiments for granite under triaxial stress (σ1>σ2>σ3) were conducted as 500°C superheated steam was transported through the borehole. High-temperature steam leads to large thermal cracks in the surrounding rock, which are randomly distributed around the borehole and gradually expand outwards. The randomly distributed thermally induced microcracks increase the complexity of the initial fracture morphology around the borehole and contribute to the appearance of multiple branch fractures. Fracture development is negligibly affected by ground stresses during the initial stages. However, fractures are deflected towards the maximum horizontal principal stress under ground stresses during later periods. During fracture propagation, high-temperature steam more easily penetrates the rock because its viscosity is lower than water. Towards the end of the crack expansion, the steam loses heat and liquefies, which increases the elongation resistance, and results in the arrest and intermittent expansion of the cracks. |
| format | Article |
| id | doaj-art-d337dcdf770e4fe3bf0c8f02e7173705 |
| institution | Kabale University |
| issn | 1468-8115 1468-8123 |
| language | English |
| publishDate | 2020-01-01 |
| publisher | Wiley |
| record_format | Article |
| series | Geofluids |
| spelling | doaj-art-d337dcdf770e4fe3bf0c8f02e71737052025-02-03T01:28:34ZengWileyGeofluids1468-81151468-81232020-01-01202010.1155/2020/66276166627616Destruction Law of Borehole Surrounding Rock of Granite under Thermo-Hydro-Mechanical CouplingJinwen Wu0Zijun Feng1Shuping Chen2Wenmei Han3School of Science, North University of China, Taiyuan, Shanxi 030051, ChinaCollege of Mining Technology, Taiyuan University of Technology, Taiyuan, Shanxi 030024, ChinaSchool of Science, North University of China, Taiyuan, Shanxi 030051, ChinaSchool of Science, North University of China, Taiyuan, Shanxi 030051, ChinaThe destruction of the rock that surrounds boreholes under thermo-hydro-mechanical coupling is an important factor for borehole stability in hot dry rock (HDR) geothermal energy extraction. Failure experiments for granite under triaxial stress (σ1>σ2>σ3) were conducted as 500°C superheated steam was transported through the borehole. High-temperature steam leads to large thermal cracks in the surrounding rock, which are randomly distributed around the borehole and gradually expand outwards. The randomly distributed thermally induced microcracks increase the complexity of the initial fracture morphology around the borehole and contribute to the appearance of multiple branch fractures. Fracture development is negligibly affected by ground stresses during the initial stages. However, fractures are deflected towards the maximum horizontal principal stress under ground stresses during later periods. During fracture propagation, high-temperature steam more easily penetrates the rock because its viscosity is lower than water. Towards the end of the crack expansion, the steam loses heat and liquefies, which increases the elongation resistance, and results in the arrest and intermittent expansion of the cracks.http://dx.doi.org/10.1155/2020/6627616 |
| spellingShingle | Jinwen Wu Zijun Feng Shuping Chen Wenmei Han Destruction Law of Borehole Surrounding Rock of Granite under Thermo-Hydro-Mechanical Coupling Geofluids |
| title | Destruction Law of Borehole Surrounding Rock of Granite under Thermo-Hydro-Mechanical Coupling |
| title_full | Destruction Law of Borehole Surrounding Rock of Granite under Thermo-Hydro-Mechanical Coupling |
| title_fullStr | Destruction Law of Borehole Surrounding Rock of Granite under Thermo-Hydro-Mechanical Coupling |
| title_full_unstemmed | Destruction Law of Borehole Surrounding Rock of Granite under Thermo-Hydro-Mechanical Coupling |
| title_short | Destruction Law of Borehole Surrounding Rock of Granite under Thermo-Hydro-Mechanical Coupling |
| title_sort | destruction law of borehole surrounding rock of granite under thermo hydro mechanical coupling |
| url | http://dx.doi.org/10.1155/2020/6627616 |
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