| Issue |
E3S Web Conf.
Volume 478, 2024
6th International Conference on Green Energy and Sustainable Development (GESD 2023)
|
|
|---|---|---|
| Article Number | 01021 | |
| Number of page(s) | 7 | |
| DOI | https://doi.org/10.1051/e3sconf/202447801021 | |
| Published online | 16 January 2024 | |
Experimental study on the effect of confining pressure and interval time on the fatigue mechanical properties of mudstone
1 Powerchina Urban Planning and Design Institute Co. Ltd., Guangdong 511400, China
2 School of Resources and Safety Engineering, Chongqing 400044, China
3 State Key laboratory of coal mine disaster dynamic and control, Chongqing 400044, China
* Corresponding author: 1830329412@qq.com
The mudstone interlayer experiences discontinuous cyclic loading during gas storage reservoir operation. To investigate the effects of intermittent action and confining pressure on the fatigue mechanical properties of mudstone. Continuous fatigue test and graded intermittent fatigue test were conducted respectively. The results show that: 1. the fatigue life of mudstone is enhanced by the intermittent effect during the fatigue process. The presence of confining pressure under the same experimental conditions also benefits the fatigue life of mudstone.2. the average modulus of elasticity of mudstone decreases with increasing stress level during cyclic loading, and both intermittency and confining pressure help to enhance the modulus of elasticity of mudstone.3. in graded intermittent fatigue tests. In both uniaxial and triaxial tests, the residual strains generated by the post-interval cycles are smaller than those generated before the intervals.4. In the 3MPa graded interval fatigue test, negative deformation occurs in the post-interval cycle due to the release of elastic energy.
© The Authors, published by EDP Sciences, 2024
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