Water-Weakening Effects on the Strength of Hard Rocks at Different Loading Rates: An Experimental Study

Zhu, Jun; Deng, Jiang; Chen, Fei; Ma, Yuanjun; Yao, Yifan

doi:10.1007/s00603-021-02482-3

Cited by 13 publications

(1 citation statement)

References 28 publications

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“…AE analysis includes parameter analysis and waveform spectrum analysis, which can reflect the internal failure evolution information of rocks. Among them, AE parameters include the rise time (RT), duration, ringing count, amplitude (A), AE energy, AE absolute energy, peak frequency, average frequency (AF), ratio of rise time to amplitude (RA = RT/A), etc., which can directly reflect the damage inside the rock and the process of initiation and development of micro-cracks [33][34][35]. Deng et al [36] conducted three-point bending tests on granite rocks in dried and saturated states, and pointed out that the saturated rock specimens had lower stiffness and lower strength, which were more prone to instability.…”

Section: Introductionmentioning

confidence: 99%

Study on the Damage Mechanism of Sandstone under Different Water Content States

Wang

赵子江

et al. 2023

Remote Sensing

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Understanding the failure mechanisms of rocks that are exposed to different water contents is important for rock stability in rock engineering applications, and the quantitative analysis of rock behavior is necessary for predicting and preventing the occurrence of rock failure due to water effects. Mechanical tests using real-time acoustic emission (AE) technology were carried out to reveal the damage evolution in sandstone rocks in a dried state, natural state, and saturated state, which includes a quantitative analysis of AE characteristics and cracking properties. The testing results indicate that with the growth of water content, sandstone rocks show a decreasing trend in strength and tend to experience gentle damage with relatively fewer fractures. The crack morphology of the main fracture surfaces is quantitatively described, including a fractal dimension calculation and cracking length measurements. As the water content rises, when rock failure occurs, a higher AE b-value can be obtained, revealing an increasing proportion of large-scale cracks. The fractal dimension of the acoustic emission hit rate shows that the evolution of rock damage and deformation has self-similarity, that is, the transformation from order to disorder to order, and it is affected by different water contents. The AE waveforms of the sandstone have two dominant frequency bands (0~75 kHz and 75~150 kHz) no matter which water-bearing state they are in. The increase in rock water content has resulted in the decline of AE waveforms located in the range of 200–300 kHz, whereas the rise of AE waveforms is located in the range of 0–50 kHz. The findings of this study deepen our understanding of the mechanism behind rock failure and provide a meaningful reference for disaster assessment and control.

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