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.0012a.svgz" name="5582218.fig.0012a" 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.0012b.svgz" name="5582218.fig.0012b" 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 vertical intervals of 0.09 m on the upper right-hand corner of the roof after the first excavation step (measurement circles 1, 7, and 8) and after the second excavation step (measurement circles 11, 71, and 81).</div>

Geofluids

fig12

Figure 12

Figure 12: Macro-Micro Response Characteristics of Surrounding Rock and Overlying Strata towards the Transition from Open-Pit to Underground Mining 