Machanical Analysis on Pipe Roof Advaned Support in Shallow Excavation

Pipe roof method, one of the advanced support patterns in underground engineering, is often used in the construction of shallow excavation. During the period of construction, the responses and deformation of the pipe umbrella are complex, so the theoretical analysis and calculation of the pipe umbrella is necessary. Based on the loading-structure mode, which regards the pipe as an Winkler elastic foundation beam and the covering soil as the load, combined with the usual excavation way in the underground engineering under the pre-support of the pipe umbrellas, an overall analysis on every excavation step is given, and calculation equations of pipe responses for the whole pipe is put forward. Then, with the example of a certain shallow buried underpass, the analytic method and FDM numerical simulation is adopted respectively. Finally, the comparation of the results and practical experiences proves that the analytic method presented is reasonable and can be referred for the pipe proofing design and construction.