Abstract The bored section of the Gongbei Tunnel on the Zhuhai Link of the Hongkong-Zhuhai-Macao bridge passes beneath the Gongbei Port and is excavated using a combination of a curved tubular roof and artificial ground freezing. Due to the environmental sensitivity of the site, the complexity of the ground conditions and the special nature of the construction method, the ground deformation control during the construction of the curved tubular roof is challenging. Based on an analysis of the influential factors of ground deformation caused by tabular roof construction, countermeasures against ground deformation are proposed, including the selection of a proper jacking machine and its corollary equipment, the dynamic control of the jacking parameters, water leakage control at the entrance,launching and receiving process, pipe stiffness requirements, and a lubrication slurry replacement. In light of the ground deformation monitoring data, the law of ground deformation is analyzed in terms of the ground deformation,ground settlement trough and ground settlement accumulative effects, providing a basis for the construction safety and rationality as well as a reference for similar projects.
Abstract：
The bored section of the Gongbei Tunnel on the Zhuhai Link of the Hongkong-Zhuhai-Macao bridge passes beneath the Gongbei Port and is excavated using a combination of a curved tubular roof and artificial ground freezing. Due to the environmental sensitivity of the site, the complexity of the ground conditions and the special nature of the construction method, the ground deformation control during the construction of the curved tubular roof is challenging. Based on an analysis of the influential factors of ground deformation caused by tabular roof construction, countermeasures against ground deformation are proposed, including the selection of a proper jacking machine and its corollary equipment, the dynamic control of the jacking parameters, water leakage control at the entrance,launching and receiving process, pipe stiffness requirements, and a lubrication slurry replacement. In light of the ground deformation monitoring data, the law of ground deformation is analyzed in terms of the ground deformation,ground settlement trough and ground settlement accumulative effects, providing a basis for the construction safety and rationality as well as a reference for similar projects.
.Control and Monitoring of Ground Deformation during Jacking of a Large-Diameter Curved Tabular Roof[J] MODERN TUNNELLING TECHNOLOGY, 2017,V54(6): 210-216
2017, Vol. 54 