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Mathematical Problems in Engineering
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Mathematical Problems in Engineering
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2015
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Article
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Tab 2
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Research Article
Intelligent Autofeedback and Safety Early-Warning for Underground Cavern Engineering during Construction Based on BP Neural Network and FEM
Table 2
The design value of physical and mechanical parameters.
Rock type
Young’s modulus (GPa)
Poisson ratio
Cohesion (MPa)
Friction degree (°)
Density (kg/m
3
)
III
6.5
0.21
0.95
43.4
2500
IV
4.5
0.23
0.60
36.5
2520
V
1.5
0.25
0.25
24.2
2610