Macro-Micro Response Characteristics of Surrounding Rock and Overlying Strata towards the Transition from Open-Pit to Underground Mining

<table class="figure-group"><tr class="fig-image" id="a"><td><object data="https://static.hindawi.com/articles/geofluids/volume-2021/5582218/figures/5582218.fig.009a.svgz" name="5582218.fig.009a" type="image/svg+xml"></object></td></tr><tr class="fig-caption"><td><b>(a) </b>First excavation step</td></tr><tr class="fig-image" id="b"><td><object data="https://static.hindawi.com/articles/geofluids/volume-2021/5582218/figures/5582218.fig.009b.svgz" name="5582218.fig.009b" type="image/svg+xml"></object></td></tr><tr class="fig-caption"><td><b>(b) </b>Second excavation step</td></tr></table>

<div>Stress evolution in the overlying strata at the upper right-hand corner of the roof and the lower left-hand corner of the floor after the first excavation step (measurement circles 1 and 4, respectively) and after the second excavation step (measurement circles 11 and 41, respectively).</div>

Geofluids

fig9

Figure 9

Figure 9: Macro-Micro Response Characteristics of Surrounding Rock and Overlying Strata towards the Transition from Open-Pit to Underground Mining 