Effect of fluid pressure gradient on the factor of safety in rock stability analysis
Inappropriate assessment of rock stability may result in anthropogenic geohazards during underground space development and energy extraction. To reasonably estimate the factor of safety (FOS) for rock stability, it is critical to address uncertainties involved in the estimation. Fluid pressure gradi...
| Main Authors: | , , , |
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| Other Authors: | |
| Format: | Journal Article |
| Language: | English |
| Published: |
2022
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| Subjects: | |
| Online Access: | https://hdl.handle.net/10356/159467 |
| _version_ | 1811678237164568576 |
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| author | Wei, Mingdong Dai, Feng Ji, Yinlin Wu, Wei |
| author2 | School of Civil and Environmental Engineering |
| author_facet | School of Civil and Environmental Engineering Wei, Mingdong Dai, Feng Ji, Yinlin Wu, Wei |
| author_sort | Wei, Mingdong |
| collection | NTU |
| description | Inappropriate assessment of rock stability may result in anthropogenic geohazards during underground space development and energy extraction. To reasonably estimate the factor of safety (FOS) for rock stability, it is critical to address uncertainties involved in the estimation. Fluid pressure gradient is of great concern in the estimation of the FOS. We carried out laboratory experiment and numerical modeling to reproduce fluid pressure gradient on a smooth fracture in granite. We compared the FOS derived from a nearly uniform fluid pressure gradient and that from a significantly non-linear fluid pressure gradient and found that the non-linear gradient of fluid pressure may amplify the FOS value. We also conducted a theoretical analysis to compare the FOS values for uniform, linear, and non-linear fluid pressure gradients. The results revealed that a considerable gradient and a pronounced non-linearity of fluid pressure are likely to cause premature failure of a rock fracture. Moreover, the upper bound of the FOS with a non-linear fluid pressure gradient depends on the initial FOS for a rock fracture without fluid pressurization. These findings are conducive to interpreting rock instability due to fluid pressurization and developing a more robust FOS estimation method. |
| first_indexed | 2024-10-01T02:50:04Z |
| format | Journal Article |
| id | ntu-10356/159467 |
| institution | Nanyang Technological University |
| language | English |
| last_indexed | 2024-10-01T02:50:04Z |
| publishDate | 2022 |
| record_format | dspace |
| spelling | ntu-10356/1594672022-06-24T04:41:48Z Effect of fluid pressure gradient on the factor of safety in rock stability analysis Wei, Mingdong Dai, Feng Ji, Yinlin Wu, Wei School of Civil and Environmental Engineering Engineering::Civil engineering Fluid Pressure Gradient Rock Fracture Inappropriate assessment of rock stability may result in anthropogenic geohazards during underground space development and energy extraction. To reasonably estimate the factor of safety (FOS) for rock stability, it is critical to address uncertainties involved in the estimation. Fluid pressure gradient is of great concern in the estimation of the FOS. We carried out laboratory experiment and numerical modeling to reproduce fluid pressure gradient on a smooth fracture in granite. We compared the FOS derived from a nearly uniform fluid pressure gradient and that from a significantly non-linear fluid pressure gradient and found that the non-linear gradient of fluid pressure may amplify the FOS value. We also conducted a theoretical analysis to compare the FOS values for uniform, linear, and non-linear fluid pressure gradients. The results revealed that a considerable gradient and a pronounced non-linearity of fluid pressure are likely to cause premature failure of a rock fracture. Moreover, the upper bound of the FOS with a non-linear fluid pressure gradient depends on the initial FOS for a rock fracture without fluid pressurization. These findings are conducive to interpreting rock instability due to fluid pressurization and developing a more robust FOS estimation method. Ministry of Education (MOE) This study was supported by Ministry of Education, Singapore, under Grant No. RG152/19. 2022-06-24T04:41:48Z 2022-06-24T04:41:48Z 2021 Journal Article Wei, M., Dai, F., Ji, Y. & Wu, W. (2021). Effect of fluid pressure gradient on the factor of safety in rock stability analysis. Engineering Geology, 294, 106346-. https://dx.doi.org/10.1016/j.enggeo.2021.106346 0013-7952 https://hdl.handle.net/10356/159467 10.1016/j.enggeo.2021.106346 2-s2.0-85114149598 294 106346 en RG152/19 Engineering Geology © 2021 Elsevier B.V. All rights reserved. |
| spellingShingle | Engineering::Civil engineering Fluid Pressure Gradient Rock Fracture Wei, Mingdong Dai, Feng Ji, Yinlin Wu, Wei Effect of fluid pressure gradient on the factor of safety in rock stability analysis |
| title | Effect of fluid pressure gradient on the factor of safety in rock stability analysis |
| title_full | Effect of fluid pressure gradient on the factor of safety in rock stability analysis |
| title_fullStr | Effect of fluid pressure gradient on the factor of safety in rock stability analysis |
| title_full_unstemmed | Effect of fluid pressure gradient on the factor of safety in rock stability analysis |
| title_short | Effect of fluid pressure gradient on the factor of safety in rock stability analysis |
| title_sort | effect of fluid pressure gradient on the factor of safety in rock stability analysis |
| topic | Engineering::Civil engineering Fluid Pressure Gradient Rock Fracture |
| url | https://hdl.handle.net/10356/159467 |
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