Abstract：Research purposes: Investigating the effect of Wuhan Yangzte River tunnel construction on buried pipelines is very important to ensure the construction safety. 3-D FEM is applied to model the deformational coupling effect for the north side shaft diaphragm, surrounding soil and buried pipelines. Construction effect on pipe deformation is analyzed in terms of excavation steps, pipe material, buried depth, distance to pit, pipe diameter and wall thickness of pipe.
Research conclusions: Take the north side shaft construction of Wuhan Yangzte River tunnel for example, this paper analyzes the construction effect in terms of excavation steps, pipe material, buried depth, distance to pit, pipe diameter and wall thickness of pipe. The result indicates that the pipeline displacement increases as excavation depth. The magnitude of the displacement is mainly determined by the first two excavation stages. The first two excavation stages should be strictly monitored; for the sake of diaphragm wall, end-effect exists on the pipeline. End-effect becomes distinct as close to the pit. And the displacement mode is changed for the sake of end-effect; outer diameter and thickness of pipeline has no distinct effect on pipeline displacement; multiple types of pipelines have no distinct effect on each other when they exist together.
[4] Lee K M , Rowe R K. Finite element modeling of the three- dimensional ground deformations due to tunneling in cohesive soils; pact I-method of analysis[J] . Computers and Geotechnice, 1990,(10):87-109.
2008, Vol. 25 
版权所有 © 2014 《铁道工程学报》编辑部