New systematic method to determine elastic constants and crack propagation thresholds of brittle rocks under triaxial compression
Elastic constants and crack propagation stress thresholds of brittle rocks are important mechanical properties for engineering applications. However, these properties are currently determined using methods with subjective interpreting procedures, which create cognitive biases leading to a higher deg...
| Main Authors: | , |
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| Other Authors: | |
| Format: | Journal Article |
| Language: | English |
| Published: |
2022
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| Online Access: | https://hdl.handle.net/10356/160647 |
| _version_ | 1811677116987604992 |
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| author | Yu, Hua Ng, Kam |
| author2 | School of Civil and Environmental Engineering |
| author_facet | School of Civil and Environmental Engineering Yu, Hua Ng, Kam |
| author_sort | Yu, Hua |
| collection | NTU |
| description | Elastic constants and crack propagation stress thresholds of brittle rocks are important mechanical properties for engineering applications. However, these properties are currently determined using methods with subjective interpreting procedures, which create cognitive biases leading to a higher degree of uncertainties. In this study, triaxial compression tests were conducted on Weber Sandstone collected from the Rock Springs Uplift, Wyoming. Nine rock specimens were treated in different geochemical conditions and tested for three different confining pressures at an in-situ pore pressure and temperature. A new method is proposed to systematically determine elastic constants and crack stress thresholds using linear and cubic regression functions to describe the linear and nonlinear stress–strain elastic behaviors, respectively. The statistical approach implemented in this new method eliminates bias due to the subjective interpretation of the nonlinear stress–strain data. The proposed method improves the consistency of elastic constant determinations by considering the linear elastic boundary of rocks and unambiguously determines the crack initiation threshold using the cubic regression function. Eliminating the subjectivity in data analysis, the new systematic method is beneficial for studying the nonlinear rock behavior and facilitating engineering applications. |
| first_indexed | 2024-10-01T02:32:16Z |
| format | Journal Article |
| id | ntu-10356/160647 |
| institution | Nanyang Technological University |
| language | English |
| last_indexed | 2024-10-01T02:32:16Z |
| publishDate | 2022 |
| record_format | dspace |
| spelling | ntu-10356/1606472022-07-29T03:33:18Z New systematic method to determine elastic constants and crack propagation thresholds of brittle rocks under triaxial compression Yu, Hua Ng, Kam School of Civil and Environmental Engineering Engineering::Civil engineering Elastic Constants Crack Propagation Thresholds Elastic constants and crack propagation stress thresholds of brittle rocks are important mechanical properties for engineering applications. However, these properties are currently determined using methods with subjective interpreting procedures, which create cognitive biases leading to a higher degree of uncertainties. In this study, triaxial compression tests were conducted on Weber Sandstone collected from the Rock Springs Uplift, Wyoming. Nine rock specimens were treated in different geochemical conditions and tested for three different confining pressures at an in-situ pore pressure and temperature. A new method is proposed to systematically determine elastic constants and crack stress thresholds using linear and cubic regression functions to describe the linear and nonlinear stress–strain elastic behaviors, respectively. The statistical approach implemented in this new method eliminates bias due to the subjective interpretation of the nonlinear stress–strain data. The proposed method improves the consistency of elastic constant determinations by considering the linear elastic boundary of rocks and unambiguously determines the crack initiation threshold using the cubic regression function. Eliminating the subjectivity in data analysis, the new systematic method is beneficial for studying the nonlinear rock behavior and facilitating engineering applications. The authors wish to thank the funding support from United States Department of Energy (DOE) under the Award No. DE-FE0023328. This manuscript is the result of work sponsored by an agency of the United States Government. 2022-07-29T03:33:18Z 2022-07-29T03:33:18Z 2021 Journal Article Yu, H. & Ng, K. (2021). New systematic method to determine elastic constants and crack propagation thresholds of brittle rocks under triaxial compression. Geotechnical and Geological Engineering, 39(5), 3931-3945. https://dx.doi.org/10.1007/s10706-021-01737-8 0960-3182 https://hdl.handle.net/10356/160647 10.1007/s10706-021-01737-8 2-s2.0-85101260548 5 39 3931 3945 en Geotechnical and Geological Engineering © 2021 The Author(s), under exclusive licence to Springer Nature Switzerland AG part of Springer Nature. All rights reserved. |
| spellingShingle | Engineering::Civil engineering Elastic Constants Crack Propagation Thresholds Yu, Hua Ng, Kam New systematic method to determine elastic constants and crack propagation thresholds of brittle rocks under triaxial compression |
| title | New systematic method to determine elastic constants and crack propagation thresholds of brittle rocks under triaxial compression |
| title_full | New systematic method to determine elastic constants and crack propagation thresholds of brittle rocks under triaxial compression |
| title_fullStr | New systematic method to determine elastic constants and crack propagation thresholds of brittle rocks under triaxial compression |
| title_full_unstemmed | New systematic method to determine elastic constants and crack propagation thresholds of brittle rocks under triaxial compression |
| title_short | New systematic method to determine elastic constants and crack propagation thresholds of brittle rocks under triaxial compression |
| title_sort | new systematic method to determine elastic constants and crack propagation thresholds of brittle rocks under triaxial compression |
| topic | Engineering::Civil engineering Elastic Constants Crack Propagation Thresholds |
| url | https://hdl.handle.net/10356/160647 |
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