Preliminary study on precursor information of loading and unloading failure of fractured sandstone in cold regions

DOI

10.2991/978-94-6463-435-8_40How to use a DOI?

Keywords

Loading and unloading; Freeze-thaw cycles; Acoustic emission b-value; Failure precursors

Abstract

The rock body engineering in the western cold region is prone to engineering geological disasters under the joint action of freezing, thawing and cyclic loading. In order to study the failure precursor information under the combined action of the two, the real-time acoustic emission (AE) monitoring test in the process of freeze-thaw fracture and complete white sandstone grading loading and unloading was carried out. The evolution characteristics of AE parameters of loaded rock were analyzed, and the AE precursor characteristics of rock instability were deeply explored. The results of the study show that the AE ringing counts of sandstones appear to have a relatively steady increase-surge period before destruction, and the appearance of the surge period signals the imminent rupture and failure of the rock; The acoustic emission b-value of the fissured sandstone decreases abruptly before destabilisation, and the failure is sudden; while the intact sandstone undergoes a short fluctuation after the sudden decrease, and the sudden decrease in b-value can be used as a precursor feature of destabilisation damage. The Felicity ratio decreases approximately linearly with the increase of loading and unloading grade, and the damage degree of sandstone increases continuously. The comprehensive analysis of AE ringing count, b-value and Felicity ratio can improve the reliability of sandstone instability prediction. The research results can provide reference for the analysis and prevention of rock mass engineering disasters in cold regions.

Copyright

© 2024 The Author(s)

Open Access

Open Access This chapter is licensed under the terms of the Creative Commons Attribution-NonCommercial 4.0 International License (http://creativecommons.org/licenses/by-nc/4.0/), which permits any noncommercial use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license and indicate if changes were made.

Download article (PDF)

TY  - CONF
AU  - Dongyang Han
AU  - Yongjun Song
AU  - Huimin Yang
PY  - 2024
DA  - 2024/06/13
TI  - Preliminary study on precursor information of loading and unloading failure of fractured sandstone in cold regions
BT  - Proceedings of the 2024 5th International Conference on Civil, Architecture and Disaster Prevention and Control (CADPC 2024)
PB  - Atlantis Press
SP  - 374
EP  - 383
SN  - 2589-4943
UR  - https://doi.org/10.2991/978-94-6463-435-8_40
DO  - 10.2991/978-94-6463-435-8_40
ID  - Han2024
ER  -