Abstract:

Crossing F1 fault, F2 fault and F3 fault, Baiyun tunnel has extremely complex geological conditions. Mud/water bursting occurs when the tunnel excavation reaches D3K334+733, which has great impact on the construction safety and construction progress. Transverse grouting and transverse pipe roof for the mud/water bursting tunnel section are executed from inside the bypass gallery and fullface curtain grouting and large pipe roof are executed from inside the main tunnel. In such way, successful watersealing grouting and consolidation are made for the mud/water bursting tunnel section. In the end, the excavation crosses the mud/water bursting section safely.

Key words: Baiyun tunnel, fault, mud/water bursting, bypass gallery, transverse grouting, transverse pipe roof