HOT BITUMEN GROUTING TO REDUCE INFLOW IN NEW YUNGCHAUG TUNNEL
Ni J C1，Weng Z X2，Chi C H1
(1Graduate Institute of Civil and Disaster Prevention Engineering，Taipei University of Technology， Taipei) (2Eastern Region Engineering Office，RRB， Yilan)
Abstract：A major inflow occurred in the New Yungchung Tunnel on October 24 1998. To overcome this huge gushing water，a long-distance drilling program was conducted to discover the geology of the region where groundwater could be a source. It suggests that there is marble bedrock and groundwater of very high pressure. Big drain pipes are then installed to release the water pressure and reduce the inflow at the working face. At last，hot bitumen grouting is used to reduce inflow. The index tests of the bitumen are carried for quality control，and the two most important factors influencing the grouting are the injection pressure and the injection temperature. The effect of grouting can be evaluated by analyzing the grout volume，the actual progress of excavation，the residual gushing water，the injection pressure and temperature of bitumen. The investigation during tunneling shows that ability of hot bitumen to penetrate the crack of the bedrock and to fill the voids is good. The total inflow is reduced apparently，and a safer environment for tunneling is provided.
倪至寬1 翁禎祥2 紀家宏1 . 防止新永春隧道湧水的熱瀝青灌漿工法[J]. 岩石力学与工程学报, 2004, 23(S2): 5200-5206.
Ni J C1，Weng Z X2，Chi C H1. HOT BITUMEN GROUTING TO REDUCE INFLOW IN NEW YUNGCHAUG TUNNEL. , 2004, 23(S2): 5200-5206.
2004, Vol. 23 
