Research on Failure Mechanism and Strengthening of Broken Roadway Affected by Upper Coal Pillar

<div>Stress diffusion when <i>E</i><sub>1</sub> &gt; <i>E</i><sub>2</sub>.</div>

Advances in Civil Engineering

Figure 8: Research on Failure Mechanism and Strengthening of Broken Roadway Affected by Upper Coal Pillar 