Abstract
Understanding the acoustic emission (AE) characteristics of rocks that have undergone freeze-thaw cycling is of great significance for the use of AE technology to monitor the stability of rock masses in cold regions. A series of freeze-thaw cycling experiments and triaxial compression AE tests of granite samples were performed. The results show that, with an increasing number of freeze-thaw cycles, the P-wave velocity and peak AE intensity of granite show a substantial downward trend. The AE ringing counts during triaxial compression can be divided into three stages: abrupt period, calm period, and failure period. The overall change of the characteristic AE signal of granite samples that underwent different freeze-thaw cycles is the same. The AE signal during the destruction of granite occurs in clear dual dominant frequency bands. The peak frequency increases with increasing load time, and this trend becomes less clear as the number of freeze-thaw cycles increases. Overall, the peak frequency distribution tends to change from high to low with an increasing number of freeze-thaw cycles. The results provide basic data for rock mass stability monitoring and prediction, which is of great significance for engineering construction and management in cold regions.
Highlights
Understanding the acoustic emission (AE) characteristics of rocks that have undergone freeze-thaw cycling is of great significance for the use of AE technology to monitor the stability of rock masses in cold regions
A series of freeze-thaw cycling experiments and triaxial compression AE tests of granite samples were performed. e results show that, with an increasing number of freeze-thaw cycles, the P-wave velocity and peak AE intensity of granite show a substantial downward trend. e AE ringing counts during triaxial compression can be divided into three stages: abrupt period, calm period, and failure period. e overall change of the characteristic AE signal of granite samples that underwent different freeze-thaw cycles is the same. e AE signal during the destruction of granite occurs in clear dual dominant frequency bands. e peak frequency increases with increasing load time, and this trend becomes less clear as the number of freeze-thaw cycles increases
Granite samples collected from a cold region were subjected to different degrees of freeze-thaw cycling and AE tests under triaxial compression were performed
Summary
Understanding the acoustic emission (AE) characteristics of rocks that have undergone freeze-thaw cycling is of great significance for the use of AE technology to monitor the stability of rock masses in cold regions. A series of freeze-thaw cycling experiments and triaxial compression AE tests of granite samples were performed. 1. Introduction e rock failure process under loading is the result of the development and propagation of primary and secondary fractures and cracks. Zhao et al monitored and analyzed the AE characteristics of submerged riprap during freeze-thaw cycles [25] Among these methods, AE technology is a nondestructive method that can be effectively applied to explore the effects of freeze-thaw damage on the AE characteristics of rock masses dynamically throughout the entire loading process. Triaxial compression experiments were performed, with AE signals monitored throughout the duration. e effects of freezethaw cycles on the AE characteristics of granite samples under triaxial compression are analyzed and discussed. e results provide basic data and an experimental reference for the application of AE monitoring and predicting the engineering stability of rock masses in cold regions
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