Abstract The structural safety of shield tunnels is fundamental for urban rail transit. Therefore, tunnel disasters need to be controlled immediately whenever they occur, otherwise they will be a serious threat to the tunnel′s structure and operation. For this reason, prevention and control of structural disasters is the most important issue for a tunnel′s structural safety. Since there is an increasing number of tunnel defects occurring in the tunnels operated in Shanghai and Nanjing, this paper classifies the structural disasters into four categories based on a contrastive analysis of shield tunnel projects (i.e., longitudinal uneven settlement, convergence and deformation, water leakage and structure damage) and presents a detailed analysis and discussion of the occurrence mechanism of each disaster as well as treatment measures and suggestions. Additionally, it details the key technologies and processes commonly used in tunnel disaster prevention and control, such as steel fiber reinforced concrete and instant sealing with chemical grouts. Finally, it predicts the future development of shield tunnel structural disaster prevention and control in China in terms of concepts, systems, mechanism construction and technical breakthroughs.
Abstract：
The structural safety of shield tunnels is fundamental for urban rail transit. Therefore, tunnel disasters need to be controlled immediately whenever they occur, otherwise they will be a serious threat to the tunnel′s structure and operation. For this reason, prevention and control of structural disasters is the most important issue for a tunnel′s structural safety. Since there is an increasing number of tunnel defects occurring in the tunnels operated in Shanghai and Nanjing, this paper classifies the structural disasters into four categories based on a contrastive analysis of shield tunnel projects (i.e., longitudinal uneven settlement, convergence and deformation, water leakage and structure damage) and presents a detailed analysis and discussion of the occurrence mechanism of each disaster as well as treatment measures and suggestions. Additionally, it details the key technologies and processes commonly used in tunnel disaster prevention and control, such as steel fiber reinforced concrete and instant sealing with chemical grouts. Finally, it predicts the future development of shield tunnel structural disaster prevention and control in China in terms of concepts, systems, mechanism construction and technical breakthroughs.
FENG Huan-Huan- 1,
2 Chang- Xiang- 2
.Analysis of Structural Disasters in Shield Tunnels and Measures and Suggestions for Waterproofing[J] MODERN TUNNELLING TECHNOLOGY, 2016,V53(6): 36-43
2016, Vol. 53 