Table 4 Physical and mechanical parameters of the surrounding rock.

From: Study on the influence of peripheral eye on over-excavation during mountain tunnel blasting construction

Surrounding rock

Elastic modulus/GPa

Poisson’s ratio

Density/kg m−3

P-wave velocity/m s−1

Decay index

Class IV surrounding rock

2.4

0.2

2200

3035

1.85

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