Table 1 Characteristics of Jinping-II hydropower project45,53,54.

From: Interpretable real-time monitoring of short-term rockbursts in underground spaces based on microseismic activities

Physical characteristics

The project includes seven parallel tunnels (four headrace tunnels, two assistant tunnels, and one drainage tunnel)

 

The average length of each tunnel is 16.67 km

 

The maximum depth of the tunnels is 2525 m

 

The maximum, intermediate and minimum principal stresses are 63 MPa, 34 MPa and 26 MPa, respectively

Lithological characteristics

The main lithology is marble

 

The saturated uniaxial compressive strength ranges from 30 to 114 MPa

 

The elastic modulus ranges from 25 to 40 GPa

 

The tensile strength ranges from 3 to 6 MPa

 

The surrounding rock masses are hard and intact

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