Abstract:

On the basis of typical metro shield tunneling in Beijing, the model test and numerical simulation are applied in order to study and verify the characteristics of deformation and inner force of largediameter overlying rainsewage pipeline. And then, the variation of vertical net distance between tunnel and pipe (l) and horizontal distance between tunnel and pipe (d) is studied. The results demonstrate that: (1) The settlement curve of pipeline distributes mild, as a result, the monitoring points should be laid out densely within the scope of joints of pipeline; and the monitoring frequency should be increased. (2) For every segment should be added with antitension measures because the top and bottom of pipeline are under tension. (3) The areas where l within 6D, where D is tunnel diameter, and d within 4D are sensitive to deformation when tunnel and pipeline are in the similar stratum; and where the stress of pipeline decreases with l and d increase.

Key words: metro tunnel, shield tunneling, rainsewage pipeline, model test, numerical simulation, pipeline settlement, pipeline stress