Comparative Study of the Excavation Damage and Rockburst of the Deeply Buried Jinping II Diversion Tunnels Using a TBM and the Drilling-Blasting Method

Figure 6

Typical cross sections of relaxation ranges measured by acoustic monitoring for rock mass of 1^#–4^# diversion tunnel: (a)∼(d) nearby k14 + 500 m, (e)∼(h) nearby k15 + 200 m, and (i)∼(l) nearby k15 + 600 m.

(a)

(b)

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(e)

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(h)

(i)

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(l)