A New Rock Brittleness Evaluation Method Based on the Complete Stress-Strain Curve
AbstractBrittleness is a crucial parameter of rock mass and the key indicator in rock engineerings, such as rockburst prediction, tunnelling machine borehole drilling, and hydraulic fracturing. To solve the problem of using present brittleness indexes, the existing rock brittleness i...
| Main Authors: | , , , , , |
|---|---|
| Format: | Article |
| Language: | English |
| Published: |
GeoScienceWorld
2021-11-01
|
| Series: | Lithosphere |
| Online Access: | https://pubs.geoscienceworld.org/lithosphere/article/2021/Special%204/4029886/609880/A-New-Rock-Brittleness-Evaluation-Method-Based-on |
| _version_ | 1818215676614017024 |
|---|---|
| author | Chenyang Liu Lizhi Du Xiaopei Zhang Yong Wang Xinmin Hu Yalu Han |
| author_facet | Chenyang Liu Lizhi Du Xiaopei Zhang Yong Wang Xinmin Hu Yalu Han |
| author_sort | Chenyang Liu |
| collection | DOAJ |
| description |
AbstractBrittleness is a crucial parameter of rock mass and the key indicator in rock engineerings, such as rockburst prediction, tunnelling machine borehole drilling, and hydraulic fracturing. To solve the problem of using present brittleness indexes, the existing rock brittleness indexes were firstly summarised in this paper. Then, a brittleness index (BL), which considers the ratio of stress drop rate and stress increase rate and the peak stress, was proposed. This new index has the advantage of simplifying the acquisition of key parameters and avoiding dimensional problems, as well as taking the complete stress-strain curves into account. While applying the BL, the peak strain is used to describe the difficulty of brittle failure before the peak point, and the ratio of stress drop to strain increase can reflect the stress drop rate without dimension problem. In order to verify the applicability of BL, through the PFC2D, the microparameters and confining pressure were changed to model different types of rock numerical specimens and different stress condition. The results show that the BL can well reflect and classify the brittleness characteristics of different rock types and characterise the constraint of confining pressure on rock brittleness. Moreover, the influence of microparameter on macroparameter was studied. In order to further verify the reliability of the brittleness index (BL), this study conducted uniaxial and triaxial compression tests (30 MPa) on marble, sandstone, limestone, and granite under different confining pressure. |
| first_indexed | 2024-12-12T06:39:52Z |
| format | Article |
| id | doaj.art-e29492cd7f674f52818842a3d72bd62b |
| institution | Directory Open Access Journal |
| issn | 1941-8264 1947-4253 |
| language | English |
| last_indexed | 2024-12-12T06:39:52Z |
| publishDate | 2021-11-01 |
| publisher | GeoScienceWorld |
| record_format | Article |
| series | Lithosphere |
| spelling | doaj.art-e29492cd7f674f52818842a3d72bd62b2022-12-22T00:34:22ZengGeoScienceWorldLithosphere1941-82641947-42532021-11-012021Special 410.2113/2021/4029886A New Rock Brittleness Evaluation Method Based on the Complete Stress-Strain CurveChenyang Liu0http://orcid.org/0000-0001-6501-0961Lizhi Du1http://orcid.org/0000-0001-9520-3692Xiaopei Zhang2Yong Wang3Xinmin Hu4Yalu Han5College of Construction Engineering Jilin University Changchun 130026 China jlu.edu.cnCollege of Construction Engineering Jilin University Changchun 130026 China jlu.edu.cnCollege of Construction Engineering Jilin University Changchun 130026 China jlu.edu.cnCollege of Construction Engineering Jilin University Changchun 130026 China jlu.edu.cnCollege of Construction Engineering Jilin University Changchun 130026 China jlu.edu.cnCollege of Construction Engineering Jilin University Changchun 130026 China jlu.edu.cn AbstractBrittleness is a crucial parameter of rock mass and the key indicator in rock engineerings, such as rockburst prediction, tunnelling machine borehole drilling, and hydraulic fracturing. To solve the problem of using present brittleness indexes, the existing rock brittleness indexes were firstly summarised in this paper. Then, a brittleness index (BL), which considers the ratio of stress drop rate and stress increase rate and the peak stress, was proposed. This new index has the advantage of simplifying the acquisition of key parameters and avoiding dimensional problems, as well as taking the complete stress-strain curves into account. While applying the BL, the peak strain is used to describe the difficulty of brittle failure before the peak point, and the ratio of stress drop to strain increase can reflect the stress drop rate without dimension problem. In order to verify the applicability of BL, through the PFC2D, the microparameters and confining pressure were changed to model different types of rock numerical specimens and different stress condition. The results show that the BL can well reflect and classify the brittleness characteristics of different rock types and characterise the constraint of confining pressure on rock brittleness. Moreover, the influence of microparameter on macroparameter was studied. In order to further verify the reliability of the brittleness index (BL), this study conducted uniaxial and triaxial compression tests (30 MPa) on marble, sandstone, limestone, and granite under different confining pressure.https://pubs.geoscienceworld.org/lithosphere/article/2021/Special%204/4029886/609880/A-New-Rock-Brittleness-Evaluation-Method-Based-on |
| spellingShingle | Chenyang Liu Lizhi Du Xiaopei Zhang Yong Wang Xinmin Hu Yalu Han A New Rock Brittleness Evaluation Method Based on the Complete Stress-Strain Curve Lithosphere |
| title | A New Rock Brittleness Evaluation Method Based on the Complete Stress-Strain Curve |
| title_full | A New Rock Brittleness Evaluation Method Based on the Complete Stress-Strain Curve |
| title_fullStr | A New Rock Brittleness Evaluation Method Based on the Complete Stress-Strain Curve |
| title_full_unstemmed | A New Rock Brittleness Evaluation Method Based on the Complete Stress-Strain Curve |
| title_short | A New Rock Brittleness Evaluation Method Based on the Complete Stress-Strain Curve |
| title_sort | new rock brittleness evaluation method based on the complete stress strain curve |
| url | https://pubs.geoscienceworld.org/lithosphere/article/2021/Special%204/4029886/609880/A-New-Rock-Brittleness-Evaluation-Method-Based-on |
| work_keys_str_mv | AT chenyangliu anewrockbrittlenessevaluationmethodbasedonthecompletestressstraincurve AT lizhidu anewrockbrittlenessevaluationmethodbasedonthecompletestressstraincurve AT xiaopeizhang anewrockbrittlenessevaluationmethodbasedonthecompletestressstraincurve AT yongwang anewrockbrittlenessevaluationmethodbasedonthecompletestressstraincurve AT xinminhu anewrockbrittlenessevaluationmethodbasedonthecompletestressstraincurve AT yaluhan anewrockbrittlenessevaluationmethodbasedonthecompletestressstraincurve AT chenyangliu newrockbrittlenessevaluationmethodbasedonthecompletestressstraincurve AT lizhidu newrockbrittlenessevaluationmethodbasedonthecompletestressstraincurve AT xiaopeizhang newrockbrittlenessevaluationmethodbasedonthecompletestressstraincurve AT yongwang newrockbrittlenessevaluationmethodbasedonthecompletestressstraincurve AT xinminhu newrockbrittlenessevaluationmethodbasedonthecompletestressstraincurve AT yaluhan newrockbrittlenessevaluationmethodbasedonthecompletestressstraincurve |