Table 2: Rock groups of carbonate rocks (marble and limestone) with possible karstification along the twin Access Tunnels (total length of each of the two tunnel is 17.5km)
Yantang formation
Baishan formation
Zagunao formation
SUM
East-side tunnels
4.5km
5.0km
–
9.5km
West-side tunnels
–
3.2km
2.7km
5.9km
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