Experimental study on mechanical and fracture-seepage characteristics of sandstone under hydro-mechanical coupling
In order to explore the fluid-solid coupling feedback characteristics of rock under the action of hydro-mechanical coupling, the triaxial and pore water pressure loading tests of saturated sandstone were carried out by using the rock mechanics multifunctional test system. Three groups of confining p...
Saved in:
| Main Authors: | , , , , |
|---|---|
| Format: | Article |
| Language: | zho |
| Published: |
Editorial Office of Safety in Coal Mines
2025-04-01
|
| Series: | Meikuang Anquan |
| Subjects: | |
| Online Access: | https://www.mkaqzz.com/cn/article/doi/10.13347/j.cnki.mkaq.20241256 |
| Tags: |
Add Tag
No Tags, Be the first to tag this record!
|
| _version_ | 1850149787805941760 |
|---|---|
| author | Jiawei LI Yujun ZHANG Jie XIAO Youwei LI Zhiwei ZHANG |
| author_facet | Jiawei LI Yujun ZHANG Jie XIAO Youwei LI Zhiwei ZHANG |
| author_sort | Jiawei LI |
| collection | DOAJ |
| description | In order to explore the fluid-solid coupling feedback characteristics of rock under the action of hydro-mechanical coupling, the triaxial and pore water pressure loading tests of saturated sandstone were carried out by using the rock mechanics multifunctional test system. Three groups of confining pressures of 10, 15, 20 MPa were set up, and the pore water pressures of 0, 20 %, 40 % and 60 % were set up under each group of confining pressures. Then, the influence of confining pressure and pore water pressure on the mechanical parameters of sandstone is analyzed. The damage evolution characteristics of the specimen under hydro-mechanical loading were analyzed by comparing the acoustic emission response characteristics. The permeability variation curve in the whole stress-strain process is obtained, and the fracture-seepage coupling analysis of rock mass is carried out in combination with the deformation and failure characteristics of sandstone. The test results show that: the peak strength and elastic modulus of sandstone increase with the increase of confining pressure, and are negatively correlated with pore water pressure, and Poisson’s ratio is positively correlated with pore water pressure. The greater the confining pressure, the stronger the compliance of the linear relationship. The variation of the peak strength of sandstone with confining pressure and pore water pressure follows the Mohr-Coulomb strength criterion. The acoustic emission events with higher energy levels occurred at the junction of the on-line elasticity and servo voltage stabilization stages, and the cumulative ringing count and energy curve showed a stepwise upward trend with the same frequency as the stress. The permeability evolution curve shows that “the permeability decreases rapidly at first, then decreases steadily in the middle zone, then rises rapidly, then rises sharply, and then is basically stable”. The permeability of high confining pressure specimens increases exponentially with the increase of water pressure, while the permeability of medium and low confining pressure specimens increases exponentially with the increase of water pressure. The critical stress condition of shear failure of rock self-rupture angle under hydro-mechanical coupling is given, and the rupture angle increases with the increase of water pressure. |
| format | Article |
| id | doaj-art-81bf71309a6e40e3a9a10544538a52d7 |
| institution | OA Journals |
| issn | 1003-496X |
| language | zho |
| publishDate | 2025-04-01 |
| publisher | Editorial Office of Safety in Coal Mines |
| record_format | Article |
| series | Meikuang Anquan |
| spelling | doaj-art-81bf71309a6e40e3a9a10544538a52d72025-08-20T02:26:46ZzhoEditorial Office of Safety in Coal MinesMeikuang Anquan1003-496X2025-04-0156418319410.13347/j.cnki.mkaq.20241256gMKAQ20241256Experimental study on mechanical and fracture-seepage characteristics of sandstone under hydro-mechanical couplingJiawei LI0Yujun ZHANG1Jie XIAO2Youwei LI3Zhiwei ZHANG4Coal Mining Branch, China Coal Research Institute, Beijing 100013, ChinaCoal Mining Branch, China Coal Research Institute, Beijing 100013, ChinaCoal Mining Branch, China Coal Research Institute, Beijing 100013, ChinaCoal Mining Branch, China Coal Research Institute, Beijing 100013, ChinaCoal Mining Branch, China Coal Research Institute, Beijing 100013, ChinaIn order to explore the fluid-solid coupling feedback characteristics of rock under the action of hydro-mechanical coupling, the triaxial and pore water pressure loading tests of saturated sandstone were carried out by using the rock mechanics multifunctional test system. Three groups of confining pressures of 10, 15, 20 MPa were set up, and the pore water pressures of 0, 20 %, 40 % and 60 % were set up under each group of confining pressures. Then, the influence of confining pressure and pore water pressure on the mechanical parameters of sandstone is analyzed. The damage evolution characteristics of the specimen under hydro-mechanical loading were analyzed by comparing the acoustic emission response characteristics. The permeability variation curve in the whole stress-strain process is obtained, and the fracture-seepage coupling analysis of rock mass is carried out in combination with the deformation and failure characteristics of sandstone. The test results show that: the peak strength and elastic modulus of sandstone increase with the increase of confining pressure, and are negatively correlated with pore water pressure, and Poisson’s ratio is positively correlated with pore water pressure. The greater the confining pressure, the stronger the compliance of the linear relationship. The variation of the peak strength of sandstone with confining pressure and pore water pressure follows the Mohr-Coulomb strength criterion. The acoustic emission events with higher energy levels occurred at the junction of the on-line elasticity and servo voltage stabilization stages, and the cumulative ringing count and energy curve showed a stepwise upward trend with the same frequency as the stress. The permeability evolution curve shows that “the permeability decreases rapidly at first, then decreases steadily in the middle zone, then rises rapidly, then rises sharply, and then is basically stable”. The permeability of high confining pressure specimens increases exponentially with the increase of water pressure, while the permeability of medium and low confining pressure specimens increases exponentially with the increase of water pressure. The critical stress condition of shear failure of rock self-rupture angle under hydro-mechanical coupling is given, and the rupture angle increases with the increase of water pressure.https://www.mkaqzz.com/cn/article/doi/10.13347/j.cnki.mkaq.20241256hydro-mechanical couplingpore water pressuremechanical propertiesacoustic emission responsepermeability-fracture evolution relationship |
| spellingShingle | Jiawei LI Yujun ZHANG Jie XIAO Youwei LI Zhiwei ZHANG Experimental study on mechanical and fracture-seepage characteristics of sandstone under hydro-mechanical coupling Meikuang Anquan hydro-mechanical coupling pore water pressure mechanical properties acoustic emission response permeability-fracture evolution relationship |
| title | Experimental study on mechanical and fracture-seepage characteristics of sandstone under hydro-mechanical coupling |
| title_full | Experimental study on mechanical and fracture-seepage characteristics of sandstone under hydro-mechanical coupling |
| title_fullStr | Experimental study on mechanical and fracture-seepage characteristics of sandstone under hydro-mechanical coupling |
| title_full_unstemmed | Experimental study on mechanical and fracture-seepage characteristics of sandstone under hydro-mechanical coupling |
| title_short | Experimental study on mechanical and fracture-seepage characteristics of sandstone under hydro-mechanical coupling |
| title_sort | experimental study on mechanical and fracture seepage characteristics of sandstone under hydro mechanical coupling |
| topic | hydro-mechanical coupling pore water pressure mechanical properties acoustic emission response permeability-fracture evolution relationship |
| url | https://www.mkaqzz.com/cn/article/doi/10.13347/j.cnki.mkaq.20241256 |
| work_keys_str_mv | AT jiaweili experimentalstudyonmechanicalandfractureseepagecharacteristicsofsandstoneunderhydromechanicalcoupling AT yujunzhang experimentalstudyonmechanicalandfractureseepagecharacteristicsofsandstoneunderhydromechanicalcoupling AT jiexiao experimentalstudyonmechanicalandfractureseepagecharacteristicsofsandstoneunderhydromechanicalcoupling AT youweili experimentalstudyonmechanicalandfractureseepagecharacteristicsofsandstoneunderhydromechanicalcoupling AT zhiweizhang experimentalstudyonmechanicalandfractureseepagecharacteristicsofsandstoneunderhydromechanicalcoupling |