Study on the Stage Failure Mechanism and Stability Control of Surrounding Rock of Repeated Mining Roadway

<div>The shape of plastic zone under the change of principal stress deflection angle of surrounding rock of circular and rectangular tunnels under numerical simulation. (a) <i>α</i> = 0°. (b) <i>α</i> = 45°. (c) <i>α</i> = 90°. <i>α</i> = 135°. (d) <i>α</i> = 180°.</div>

Advances in Civil Engineering

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Figure 13

Figure 13: Study on the Stage Failure Mechanism and Stability Control of Surrounding Rock of Repeated Mining Roadway 