Study on the Safety Thickness of Rock Strata for Outburst Prevention in Deep Tunnel Based on Numerical Modeling and Backpropagation Neural Network

Figure 7

Calculation cloud diagram of the tunnel section under different water pressures. (a) Horizontal stress. (b) Vertical stress. (c) Horizontal displacement. (d) Vertical displacement. (e) Plastic zone limit penetration.

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(b)

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