Table 9 Comparison table of influences of Over-excavation of Newly-built tunnels on blasting peak stress of vault and arch shoulder of adjacent tunnels under different working Conditions.

From: Study on the influence of blasting on the structural stability of newly-built and adjacent tunnels

Part

Working Condition

Overbreak Area

Peak Stress (MPa)

Comparison with Benchmark Condition 1

Comparison with Other Conditions

Adjacent tunnel vault

2,3

Side-wall or arch shoulder

0.32

−13.51%

 

4

Side-wall + arch shoulder

0.48

29.73%

 

Adjacent tunnel arch shoulder

1

-

0.23

  

2

arch shoulder + Vault

0.48

 

109% higher than condition 5

3

Side-wall + Vault

0.39

 

23.08% lower than condition 5; 41.03% lower than condition 2

4

Side-wall + arch shoulder

0.48

 

0.8% lower than condition 5; 28.2% higher than condition 3

5

Side-wall + arch shoulder + Vault

0.50

 

23.08% higher than condition 3; 41.03% higher than condition 2

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