A platform for research: civil engineering, architecture and urbanism
A platform for research: civil engineering, architecture and urbanism
Electromagnetic radiation prediction of damage characteristics of water-bearing sandstone under cyclic loading and unloading
Abstract This study is aimed at revealing the effect of water on the damage and instability of sandstone under cyclic loading and unloading. To achieve this aim, first, an electromagnetic radiation (EMR) experiment was performed on five groups of sandstone samples with gradient water content under uniaxial cyclic loading and unloading to investigate the time sequence characteristics of EMR signals released by these samples. Based on the EMR signals, the damage evolution process of sandstone was studied. Furthermore, the damage prediction formula of water-bearing sandstone under cyclic loading and unloading was established and verified. Finally, the precursor characteristics of sandstone instability were analyzed with reference to the critical slowing down theory. The experiment results are as follows. The existence of water significantly weakens EMR, but the weakening rate decreases with the increase of water content. Besides, the damage variable of samples with different moisture contents based on EMR energy changes steadily first and then increases with the rise of the peak stress in the loading and unloading stage. Moreover, with the rise of water content, the number of cycles corresponding to the sudden surge of the damage variable gradually decreases. The verification suggests that the damage prediction formula of water-bearing sandstone based on EMR signals is highly accurate. The variance of EMR signals rockets suddenly prior to sandstone instability, so it can be used as a precursor for the instability and failure of sandstone samples. On top of that, the higher the water content is, the earlier the precursor occurs.
Electromagnetic radiation prediction of damage characteristics of water-bearing sandstone under cyclic loading and unloading
Abstract This study is aimed at revealing the effect of water on the damage and instability of sandstone under cyclic loading and unloading. To achieve this aim, first, an electromagnetic radiation (EMR) experiment was performed on five groups of sandstone samples with gradient water content under uniaxial cyclic loading and unloading to investigate the time sequence characteristics of EMR signals released by these samples. Based on the EMR signals, the damage evolution process of sandstone was studied. Furthermore, the damage prediction formula of water-bearing sandstone under cyclic loading and unloading was established and verified. Finally, the precursor characteristics of sandstone instability were analyzed with reference to the critical slowing down theory. The experiment results are as follows. The existence of water significantly weakens EMR, but the weakening rate decreases with the increase of water content. Besides, the damage variable of samples with different moisture contents based on EMR energy changes steadily first and then increases with the rise of the peak stress in the loading and unloading stage. Moreover, with the rise of water content, the number of cycles corresponding to the sudden surge of the damage variable gradually decreases. The verification suggests that the damage prediction formula of water-bearing sandstone based on EMR signals is highly accurate. The variance of EMR signals rockets suddenly prior to sandstone instability, so it can be used as a precursor for the instability and failure of sandstone samples. On top of that, the higher the water content is, the earlier the precursor occurs.
Electromagnetic radiation prediction of damage characteristics of water-bearing sandstone under cyclic loading and unloading
Shen, Rongxi (author) / Chen, Hailiang (author) / Zhao, Enlai (author) / Li, Taixun (author) / Fan, Weijun (author) / Yuan, Zichen (author)
2022
Article (Journal)
Electronic Resource
English
BKL:
56.00$jBauwesen: Allgemeines
/
38.58
Geomechanik
/
38.58$jGeomechanik
/
56.20
Ingenieurgeologie, Bodenmechanik
/
56.00
Bauwesen: Allgemeines
/
56.20$jIngenieurgeologie$jBodenmechanik
RVK:
ELIB18
Study on Damage Characteristics of Water-Bearing Coal Samples under Cyclic Loading–Unloading
| DOAJ | 2022
Hydromechanical Coupling Characteristics of the Fractured Sandstone under Cyclic Loading-Unloading
| DOAJ | 2020