Study on Surrounding Rock Deformation Discipline of Extra-Large Section Super-Shallow-Buried Tunnel
The type B section of Hongqihegou station is cross section and its excavation section area is about 730 m2. This section is located in rail transit line 3 at the center of Chongqing. For this reason, the heavy traffic, large amount buildings and pipelines surrounding, super-shallow-buried depth and small cross-cover ratio (only 0.4) become the determinant factor in tunnel construction. By using a new method—the up-down sidewall drift method combined with first-wall-and-then-arch method, the Hongqihegou station was successfully completed. Through the analysis of the monitoring measurement data, the discipline of surrounding rock deformation during construction is revealed.
M. L. Huang et al., "Study on Surrounding Rock Deformation Discipline of Extra-Large Section Super-Shallow-Buried Tunnel", Applied Mechanics and Materials, Vols. 90-93, pp. 2318-2322, 2011