Case Study on Construction Technology of Underground Excavation of Long-span Tunnel in Subway Station
There are many difficulties in the construction technology of underground excavation of long-span tun-nels in subway engineering.The major difficulties in underground excavation of Chengfu Road Station in Beijing lie in the complicated geological conditions with many existing buildings around,while the excavation section is a large-span double-arch tunnel,which is relatively difficult to construct.Through the use of middle guide tunnel excavation and support,the sequential construction is conducted by three stages,and the constructing measures are ensured by controlling the quality of light and dark joints,construction settlement and deformation,as well as protecting the upper pipeline,which can promote the smooth construction of the underground excavation of long-span tunnel,ensure the constructing safety and quality of long-span tunnel,and reduce the adverse impact on the surrounding environment and existing buildings.
subway engineeringunderground excavationlong spantunnel construction
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维普
