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Treatment Measures for Collapses of the Shallow-buried Highway Tunnel with Large Cross-section and Its Effects Analysis
(1 CCCC Second Harbour Engineering Co., Ltd., Wuhan 430040; 2 CCCC Highway Bridges National Engineering Research Center Co.,Ltd., Beijing 100011; 3 Key Laboratory of Large-span Bridge Construction Technology, Ministry of Communications, Wuhan 430040;4 Research and Development Center of Intelligent Manufacturing Technologies of Transport Infrastructure of Transport Industry, Wuhan 430040)
Abstract Proper treatment measures for tunnel collapse can ensure the safety of tunnel construction and effective? ly avoid the secondary collapse. Based on the background of the collapse and cave-in event at the entrance of the tunnel of Shenzhen outer ring expressway, this paper analyzes the causes of the collapse, proposes the corresponding measures to deal with the collapse, and analyzes the treatment effect of the collapse by numerical simulation and monitoring measurement. The results show that the factors like upper-hard and lower-soft stratum, poor construction quality of pipe-roof and excessive blasting cycle are the main reasons to cause the collapse and cave-in of the tunnel; it can safely pass through the collapsed area with the combination of sandbag backfilling, radial grouting of small conduit, normal grouting at working face and concrete supporting at the arch bottom.
Abstract：
Proper treatment measures for tunnel collapse can ensure the safety of tunnel construction and effective? ly avoid the secondary collapse. Based on the background of the collapse and cave-in event at the entrance of the tunnel of Shenzhen outer ring expressway, this paper analyzes the causes of the collapse, proposes the corresponding measures to deal with the collapse, and analyzes the treatment effect of the collapse by numerical simulation and monitoring measurement. The results show that the factors like upper-hard and lower-soft stratum, poor construction quality of pipe-roof and excessive blasting cycle are the main reasons to cause the collapse and cave-in of the tunnel; it can safely pass through the collapsed area with the combination of sandbag backfilling, radial grouting of small conduit, normal grouting at working face and concrete supporting at the arch bottom.
YANG Lin1,
2 JIANG Hong1,
3 CHEN Peishuai1 etc
.Treatment Measures for Collapses of the Shallow-buried Highway Tunnel with Large Cross-section and Its Effects Analysis[J] MODERN TUNNELLING TECHNOLOGY, 2020,V57(6): 207-213
2020, Vol. 57 