Study on failure mechanism of tight sandstone based on moment tensor inversion
Understanding deep rocks' mechanical properties and failure evolution is crucial for efficient resource development. This study investigates the mechanical properties of tight sandstone and analyzes its acoustic emission (AE) characteristics using a combined discrete element model and moment te...
| Main Authors: | , , |
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| Format: | Article |
| Language: | English |
| Published: |
Elsevier
2023-08-01
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| Series: | Heliyon |
| Subjects: | |
| Online Access: | http://www.sciencedirect.com/science/article/pii/S2405844023062382 |
| _version_ | 1797732942192050176 |
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| author | Yike Dang Zheng Yang Haiyan Zhu |
| author_facet | Yike Dang Zheng Yang Haiyan Zhu |
| author_sort | Yike Dang |
| collection | DOAJ |
| description | Understanding deep rocks' mechanical properties and failure evolution is crucial for efficient resource development. This study investigates the mechanical properties of tight sandstone and analyzes its acoustic emission (AE) characteristics using a combined discrete element model and moment tensor inversion. The AE activity during loading is categorized into three stages: crack initiation, stable crack propagation, and unstable crack propagation. Confining pressure loading suppresses AE activity during the crack initiation stage due to damage healing phenomenon. Moment tensor inversion reveals that tensile failure is the primary AE failure source, despite samples exhibiting splitting and shear failure modes. The proportion of AE failure types varies with stress levels and depends on the mechanical environment. Microcracks initiate at the ends of the sample and propagate inward along the loading direction, resulting in a blank area of AE events in the middle. This blank area can be utilized to predict specimen failure mode. The b value, representing the ratio of small to large magnitude events, decreases with increase of the confining pressure, indicating higher energy release during specimen failure under high confining pressure. The research results can provide a reference for predicting the failure of tight sandstone. |
| first_indexed | 2024-03-12T12:20:47Z |
| format | Article |
| id | doaj.art-925c4e0554b24ec18c93cfab5a693849 |
| institution | Directory Open Access Journal |
| issn | 2405-8440 |
| language | English |
| last_indexed | 2024-03-12T12:20:47Z |
| publishDate | 2023-08-01 |
| publisher | Elsevier |
| record_format | Article |
| series | Heliyon |
| spelling | doaj.art-925c4e0554b24ec18c93cfab5a6938492023-08-30T05:53:29ZengElsevierHeliyon2405-84402023-08-0198e19030Study on failure mechanism of tight sandstone based on moment tensor inversionYike Dang0Zheng Yang1Haiyan Zhu2School of Human Settlements and Civil Engineering, Xi'an Jiaotong University, Xi'an, 710049, ChinaSchool of Human Settlements and Civil Engineering, Xi'an Jiaotong University, Xi'an, 710049, China; Corresponding authors.State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation, Chengdu University of Technology, Chengdu, 610059, China; Corresponding authors.Understanding deep rocks' mechanical properties and failure evolution is crucial for efficient resource development. This study investigates the mechanical properties of tight sandstone and analyzes its acoustic emission (AE) characteristics using a combined discrete element model and moment tensor inversion. The AE activity during loading is categorized into three stages: crack initiation, stable crack propagation, and unstable crack propagation. Confining pressure loading suppresses AE activity during the crack initiation stage due to damage healing phenomenon. Moment tensor inversion reveals that tensile failure is the primary AE failure source, despite samples exhibiting splitting and shear failure modes. The proportion of AE failure types varies with stress levels and depends on the mechanical environment. Microcracks initiate at the ends of the sample and propagate inward along the loading direction, resulting in a blank area of AE events in the middle. This blank area can be utilized to predict specimen failure mode. The b value, representing the ratio of small to large magnitude events, decreases with increase of the confining pressure, indicating higher energy release during specimen failure under high confining pressure. The research results can provide a reference for predicting the failure of tight sandstone.http://www.sciencedirect.com/science/article/pii/S2405844023062382Acoustic emissionMoment tensor inversionFailure evolutionAE magnitudesTight sandstone |
| spellingShingle | Yike Dang Zheng Yang Haiyan Zhu Study on failure mechanism of tight sandstone based on moment tensor inversion Heliyon Acoustic emission Moment tensor inversion Failure evolution AE magnitudes Tight sandstone |
| title | Study on failure mechanism of tight sandstone based on moment tensor inversion |
| title_full | Study on failure mechanism of tight sandstone based on moment tensor inversion |
| title_fullStr | Study on failure mechanism of tight sandstone based on moment tensor inversion |
| title_full_unstemmed | Study on failure mechanism of tight sandstone based on moment tensor inversion |
| title_short | Study on failure mechanism of tight sandstone based on moment tensor inversion |
| title_sort | study on failure mechanism of tight sandstone based on moment tensor inversion |
| topic | Acoustic emission Moment tensor inversion Failure evolution AE magnitudes Tight sandstone |
| url | http://www.sciencedirect.com/science/article/pii/S2405844023062382 |
| work_keys_str_mv | AT yikedang studyonfailuremechanismoftightsandstonebasedonmomenttensorinversion AT zhengyang studyonfailuremechanismoftightsandstonebasedonmomenttensorinversion AT haiyanzhu studyonfailuremechanismoftightsandstonebasedonmomenttensorinversion |