Abstract Through the survey it is found that there is serious shortage of durability in existing mountain tunnel structures, and defects including cracking,leak, crystal dissolution and even concrete spalling of the arch in many tunnels’ second linings soon after the operation of these tunnels in China. Insufficiency of duability results from not only the design but also the construction. According to the representation of existing tunnels’ diseases, this paper analyses the construction reasons which result in the insufficient durability of the tunnels’ second linings, and proposes construction strategies to solve thelack of the second lining concrete durability of newly-built tunnel structure concrete. The specific measures are using multiple composite cementitious materials, adopting proper concrete mixing process, using low water-cement ratio, adopting small water usage and effective superplasticizer, using advanced pouring and vibrating technology, taking reasonable maintaining technology and forming removal and curing time. These measures may provide some references for new tunnels’ construction.
Abstract：
Through the survey it is found that there is serious shortage of durability in existing mountain tunnel structures, and defects including cracking,leak, crystal dissolution and even concrete spalling of the arch in many tunnels’ second linings soon after the operation of these tunnels in China. Insufficiency of duability results from not only the design but also the construction. According to the representation of existing tunnels’ diseases, this paper analyses the construction reasons which result in the insufficient durability of the tunnels’ second linings, and proposes construction strategies to solve thelack of the second lining concrete durability of newly-built tunnel structure concrete. The specific measures are using multiple composite cementitious materials, adopting proper concrete mixing process, using low water-cement ratio, adopting small water usage and effective superplasticizer, using advanced pouring and vibrating technology, taking reasonable maintaining technology and forming removal and curing time. These measures may provide some references for new tunnels’ construction.
WANG Hai-Yan-1,
2 ,
Chou-Wen-Ge-1 etc
.Research on the Construction Solutions to Increase the lining Concrete Durability of Mountains Tunnel under Aggressive environments[J] MODERN TUNNELLING TECHNOLOGY, 2011,V48(6): 17-22
2011, Vol. 48 