Study on failure models and fractal characteristics of shale under seepage‐stress coupling
Abstract The existence of bedding in shale plays an important role in the physical properties and destruction processes of shale. In order to study the failure mechanism of shale with different dip angles under the coupling of seepage and stress, the study uses RFPA2D‐Flow software to advance the se...
| Main Authors: | , , , , , , |
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| Format: | Article |
| Language: | English |
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Wiley
2020-05-01
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| Series: | Energy Science & Engineering |
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| Online Access: | https://doi.org/10.1002/ese3.621 |
| _version_ | 1818518952139030528 |
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| author | Yili Lou Zhonghu Wu Wenjibin Sun Shuai Yin Anli Wang Hao Liu Yujun Zuo |
| author_facet | Yili Lou Zhonghu Wu Wenjibin Sun Shuai Yin Anli Wang Hao Liu Yujun Zuo |
| author_sort | Yili Lou |
| collection | DOAJ |
| description | Abstract The existence of bedding in shale plays an important role in the physical properties and destruction processes of shale. In order to study the failure mechanism of shale with different dip angles under the coupling of seepage and stress, the study uses RFPA2D‐Flow software to advance the seepage‐stress coupling numerical simulation for seven groups of different bedding direction shale. Research shows that (1) the compressive strength and elastic modulus of shale are significantly affected by the bedding directions. The compressive strength can be observed with the apparent anisotropy of the shale compressive strength with the change of the bedding angle α; the elastic modulus increase with the increase in α as a whole. (2) The ultimate failure mode of shale under different bedding angles can be divided into V type (0°), inverted V type (15°), multi‐line type (30°), oblique type I (45°, 90°), and oblique N type (60°, 75°); the failure of shale in each group direction is mainly tensile failure with a small amount of shear failure. It can be found that the spatial distribution of acoustic emission (AE) reflected the macroscopic failure mode of shale. (3) The fractal dimension can well reflect the failure mode of the sample. From the trend of the dip‐fractal dimension curve, the fractal dimension of the multi‐line type reach to maximum, which is 1.41 699, and the D value of the oblique type I is the smallest, between 1.28 191 and 1.286 181. And the values of the inverted V type, V type and oblique N type, between 1.286 181 and 1.41 699. Therefore, the larger the value is, the more complex the shale failure mode is. |
| first_indexed | 2024-12-11T01:17:17Z |
| format | Article |
| id | doaj.art-ff2f7e36523a41028ef1067d1681c07b |
| institution | Directory Open Access Journal |
| issn | 2050-0505 |
| language | English |
| last_indexed | 2024-12-11T01:17:17Z |
| publishDate | 2020-05-01 |
| publisher | Wiley |
| record_format | Article |
| series | Energy Science & Engineering |
| spelling | doaj.art-ff2f7e36523a41028ef1067d1681c07b2022-12-22T01:25:51ZengWileyEnergy Science & Engineering2050-05052020-05-01851634164910.1002/ese3.621Study on failure models and fractal characteristics of shale under seepage‐stress couplingYili Lou0Zhonghu Wu1Wenjibin Sun2Shuai Yin3Anli Wang4Hao Liu5Yujun Zuo6College of Civil Engineering Guizhou University Guiyang ChinaCollege of Civil Engineering Guizhou University Guiyang ChinaMining College Guizhou University Guiyang ChinaShandong Provincial Key Laboratory of Depositional Mineralization & Sedimentary Minerals Shandong University of Science and Technology Qingdao ChinaGuizhou Province Quality and Safety Traffic Engineering Monitoring and Inspection Center CO., LTD Guiyang ChinaMining College Guizhou University Guiyang ChinaMining College Guizhou University Guiyang ChinaAbstract The existence of bedding in shale plays an important role in the physical properties and destruction processes of shale. In order to study the failure mechanism of shale with different dip angles under the coupling of seepage and stress, the study uses RFPA2D‐Flow software to advance the seepage‐stress coupling numerical simulation for seven groups of different bedding direction shale. Research shows that (1) the compressive strength and elastic modulus of shale are significantly affected by the bedding directions. The compressive strength can be observed with the apparent anisotropy of the shale compressive strength with the change of the bedding angle α; the elastic modulus increase with the increase in α as a whole. (2) The ultimate failure mode of shale under different bedding angles can be divided into V type (0°), inverted V type (15°), multi‐line type (30°), oblique type I (45°, 90°), and oblique N type (60°, 75°); the failure of shale in each group direction is mainly tensile failure with a small amount of shear failure. It can be found that the spatial distribution of acoustic emission (AE) reflected the macroscopic failure mode of shale. (3) The fractal dimension can well reflect the failure mode of the sample. From the trend of the dip‐fractal dimension curve, the fractal dimension of the multi‐line type reach to maximum, which is 1.41 699, and the D value of the oblique type I is the smallest, between 1.28 191 and 1.286 181. And the values of the inverted V type, V type and oblique N type, between 1.286 181 and 1.41 699. Therefore, the larger the value is, the more complex the shale failure mode is.https://doi.org/10.1002/ese3.621acoustic emissionfailure modefractal dimensionnumerical simulationseepage‐stress couplingshale |
| spellingShingle | Yili Lou Zhonghu Wu Wenjibin Sun Shuai Yin Anli Wang Hao Liu Yujun Zuo Study on failure models and fractal characteristics of shale under seepage‐stress coupling Energy Science & Engineering acoustic emission failure mode fractal dimension numerical simulation seepage‐stress coupling shale |
| title | Study on failure models and fractal characteristics of shale under seepage‐stress coupling |
| title_full | Study on failure models and fractal characteristics of shale under seepage‐stress coupling |
| title_fullStr | Study on failure models and fractal characteristics of shale under seepage‐stress coupling |
| title_full_unstemmed | Study on failure models and fractal characteristics of shale under seepage‐stress coupling |
| title_short | Study on failure models and fractal characteristics of shale under seepage‐stress coupling |
| title_sort | study on failure models and fractal characteristics of shale under seepage stress coupling |
| topic | acoustic emission failure mode fractal dimension numerical simulation seepage‐stress coupling shale |
| url | https://doi.org/10.1002/ese3.621 |
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