Abstract To reduce the construction risks associated with long-distance river-crossing shield tunnels, such as the cross passages and intermediate ventilation shafts of the Nanjing metro line 3 and line 10 projects, and to ensure normal vehicle driving conditions and prevent disasters, a type of cross section with a single tube, double tracks, and three levels was proposed. This selection was made after performing a comparison and optimization of river-crossing tunnel options, cross section designs, internal structural layouts, and construction methods. The results show that, except for reducing construction risks and meeting the operation and disaster prevention requirements, it can maximize the utilization of tunnel space and give full play to the traffic capacity with significant social, economic, and environmental benefits.
Abstract：
To reduce the construction risks associated with long-distance river-crossing shield tunnels, such as the cross passages and intermediate ventilation shafts of the Nanjing metro line 3 and line 10 projects, and to ensure normal vehicle driving conditions and prevent disasters, a type of cross section with a single tube, double tracks, and three levels was proposed. This selection was made after performing a comparison and optimization of river-crossing tunnel options, cross section designs, internal structural layouts, and construction methods. The results show that, except for reducing construction risks and meeting the operation and disaster prevention requirements, it can maximize the utilization of tunnel space and give full play to the traffic capacity with significant social, economic, and environmental benefits.
.Study of a Reasonable Cross Section Type for a Long-Distance Shield Tunnel Crossing Under a River[J] MODERN TUNNELLING TECHNOLOGY, 2013,V50(6): 139-146
2013, Vol. 50 