Investigation on Acoustic Emission Kaiser Effect and Frequency Spectrum Characteristics of Rock Joints Subjected to Multilevel Cyclic Shear Loads

<table class="figure-group"><tr class="fig-image" id="a"><td><object data="https://static-preview.hindawi.com/articles/geofluids/volume-2021/5569525/figures/5569525.fig.0014a.svgz" name="5569525.fig.0014a" type="image/svg+xml"></object></td></tr><tr class="fig-caption"><td><b>(a) </b>Low-amplitude and high-frequency tensile signal</td></tr><tr class="fig-image" id="b"><td><object data="https://static-preview.hindawi.com/articles/geofluids/volume-2021/5569525/figures/5569525.fig.0014b.svgz" name="5569525.fig.0014b" type="image/svg+xml"></object></td></tr><tr class="fig-caption"><td><b>(b) </b>Low-amplitude and low-frequency friction signal</td></tr><tr class="fig-image" id="c"><td><object data="https://static-preview.hindawi.com/articles/geofluids/volume-2021/5569525/figures/5569525.fig.0014c.svgz" name="5569525.fig.0014c" type="image/svg+xml"></object></td></tr><tr class="fig-caption"><td><b>(c) </b>Medium-amplitude and low-frequency friction signal</td></tr><tr class="fig-image" id="d"><td><object data="https://static-preview.hindawi.com/articles/geofluids/volume-2021/5569525/figures/5569525.fig.0014d.svgz" name="5569525.fig.0014d" type="image/svg+xml"></object></td></tr><tr class="fig-caption"><td><b>(d) </b>High-amplitude and low-frequency friction signal</td></tr></table>

<div>Typical AE waveform and spectrum signals of rock joints under direct shear test.</div>

Geofluids

fig14

Figure 14

Figure 14: Investigation on Acoustic Emission Kaiser Effect and Frequency Spectrum Characteristics of Rock Joints Subjected to Multilevel Cyclic Shear Loads 

Figure 14 | Investigation on Acoustic Emission Kaiser Effect and Frequency Spectrum Characteristics of Rock Joints Subjected to Multilevel Cyclic Shear Loads 