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Mathematical Problems in Engineering
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2020
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Article
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Tab 4
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Research Article
Study on Energy Release of Surrounding Rock under the Multiple Unloading Disturbance during Tunnel Excavation
Table 4
Scaling factor related to the minimum principal stress.
σ
3
(MPa)
0
2
4
8
18
24.9
25
1.00
0.85
0.75
0.65
0.45
0.35
0