An Experimental Research on Surrounding Rock Unloading during Solid Coal Roadway Excavation

<table class="figure-group"><tr class="fig-image" id="a"><td><object data="https://static-preview.hindawi.com/articles/geofluids/volume-2021/5604642/figures/5604642.fig.004a.svgz" name="5604642.fig.004a" type="image/svg+xml"></object></td></tr><tr class="fig-caption"><td><b>(a) </b>Unloading rate effect</td></tr><tr class="fig-image" id="b"><td><object data="https://static-preview.hindawi.com/articles/geofluids/volume-2021/5604642/figures/5604642.fig.004b.svgz" name="5604642.fig.004b" type="image/svg+xml"></object></td></tr><tr class="fig-caption"><td><b>(b) </b>Loading rate effect</td></tr></table>

<div>Schematic diagram of the stress path of unloading confining pressure and loading axial pressure.</div>

Geofluids

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Figure 4

Figure 4: An Experimental Research on Surrounding Rock Unloading during Solid Coal Roadway Excavation 