Mechanism of Strain Burst by Laboratory and Numerical Analysis

<div>Vertical stress-strain curves of the roof and floor after unloading on one side of the excavation wall under various system stiffness. The two numbers under each graph are Young’s modulus ratio (<i>R</i><sub>E</sub>) and stiffness ratio (<i>R</i><sub>K</sub>), respectively. The magnification of the last five graphs is also plotted due to the relatively small strains.</div>

Shock and Vibration

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Figure 10

Figure 10: Mechanism of Strain Burst by Laboratory and Numerical Analysis 