Study of damage constitutive model of brittle rocks considering stress dropping characteristics
Deep brittle rock exhibits characteristics of rapid stress dropping rate and large stress dropping degree after peak failure. To simulate the whole process of deformation and failure of the deep brittle rock under load, the Lemaitre strain equivalent theory is modified to make the damaged part of th...
| Main Authors: | , , , |
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| 其他作者: | |
| 格式: | Journal Article |
| 语言: | English |
| 出版: |
2021
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| 主题: | |
| 在线阅读: | https://hdl.handle.net/10356/148353 |
| _version_ | 1826128124244393984 |
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| author | Li, Fei You, Shuang Ji, Hongguang Wang, Hao |
| author2 | School of Civil and Environmental Engineering |
| author_facet | School of Civil and Environmental Engineering Li, Fei You, Shuang Ji, Hongguang Wang, Hao |
| author_sort | Li, Fei |
| collection | NTU |
| description | Deep brittle rock exhibits characteristics of rapid stress dropping rate and large stress dropping degree after peak failure. To simulate the whole process of deformation and failure of the deep brittle rock under load, the Lemaitre strain equivalent theory is modified to make the damaged part of the rock has residual stress. Based on the damage constitutive model considering residual strength characteristics, a correction factor reflecting stress dropping rate is added, the Weibull distribution is used to describe the inhomogeneity of rock materials, and Drucker-Prager criterion is used to quantitatively describe the influence of stress on damage; a damage constitutive model of deep brittle rock considering stress dropping characteristics is established. According to the geometric features of the rock stress-strain curve, the theoretical expressions of model parameters are derived. To verify the rationality of the model, triaxial compression experiments of deep brittle rock under different confining pressures are conducted. And the influence of model parameters on rock mechanical behaviour is analysed. The results show that the model reflects the stress dropping characteristics of deep brittle rock and the theoretical curve is in good agreement with the experimental results, which indicates that the proposed constitutive model is scientific and feasible. |
| first_indexed | 2024-10-01T07:19:48Z |
| format | Journal Article |
| id | ntu-10356/148353 |
| institution | Nanyang Technological University |
| language | English |
| last_indexed | 2024-10-01T07:19:48Z |
| publishDate | 2021 |
| record_format | dspace |
| spelling | ntu-10356/1483532021-04-29T00:38:29Z Study of damage constitutive model of brittle rocks considering stress dropping characteristics Li, Fei You, Shuang Ji, Hongguang Wang, Hao School of Civil and Environmental Engineering Engineering::Civil engineering Rock Mechanics Lemaitre Strain Equivalent Theory Deep brittle rock exhibits characteristics of rapid stress dropping rate and large stress dropping degree after peak failure. To simulate the whole process of deformation and failure of the deep brittle rock under load, the Lemaitre strain equivalent theory is modified to make the damaged part of the rock has residual stress. Based on the damage constitutive model considering residual strength characteristics, a correction factor reflecting stress dropping rate is added, the Weibull distribution is used to describe the inhomogeneity of rock materials, and Drucker-Prager criterion is used to quantitatively describe the influence of stress on damage; a damage constitutive model of deep brittle rock considering stress dropping characteristics is established. According to the geometric features of the rock stress-strain curve, the theoretical expressions of model parameters are derived. To verify the rationality of the model, triaxial compression experiments of deep brittle rock under different confining pressures are conducted. And the influence of model parameters on rock mechanical behaviour is analysed. The results show that the model reflects the stress dropping characteristics of deep brittle rock and the theoretical curve is in good agreement with the experimental results, which indicates that the proposed constitutive model is scientific and feasible. Published version 2021-04-29T00:38:29Z 2021-04-29T00:38:29Z 2020 Journal Article Li, F., You, S., Ji, H. & Wang, H. (2020). Study of damage constitutive model of brittle rocks considering stress dropping characteristics. Advances in Civil Engineering, 2020. https://dx.doi.org/10.1155/2020/8875029 1687-8086 0000-0003-3671-7903 0000-0002-3158-3371 0000-0002-9262-8326 https://hdl.handle.net/10356/148353 10.1155/2020/8875029 2-s2.0-85095987064 2020 en Advances in Civil Engineering © 2020 The Author(s). This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. application/pdf |
| spellingShingle | Engineering::Civil engineering Rock Mechanics Lemaitre Strain Equivalent Theory Li, Fei You, Shuang Ji, Hongguang Wang, Hao Study of damage constitutive model of brittle rocks considering stress dropping characteristics |
| title | Study of damage constitutive model of brittle rocks considering stress dropping characteristics |
| title_full | Study of damage constitutive model of brittle rocks considering stress dropping characteristics |
| title_fullStr | Study of damage constitutive model of brittle rocks considering stress dropping characteristics |
| title_full_unstemmed | Study of damage constitutive model of brittle rocks considering stress dropping characteristics |
| title_short | Study of damage constitutive model of brittle rocks considering stress dropping characteristics |
| title_sort | study of damage constitutive model of brittle rocks considering stress dropping characteristics |
| topic | Engineering::Civil engineering Rock Mechanics Lemaitre Strain Equivalent Theory |
| url | https://hdl.handle.net/10356/148353 |
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