| Citation: | NIU Ye. Mechanical model and pipe diameter optimization of a pipe jacking roof in river crossings according to the Pasternak elastic foundation beam[J]. Bulletin of Geological Science and Technology，2025，44（2）：1-8 doi: 10.19509/j.cnki.dzkq.tb20230594
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The analysis of the force characteristics of the support pipe is the basis for the structural design of the pipe jacking roof, which ensures the safety of tunnel excavation.
In order to analyze the mechanical behavior of the pipe roof during tunnel excavation,
an analytical model of the support pipe at the bottom of the pipe jacking roof is constructed based on the Pasternak elastic foundation beam theory, making full use of the displacement, rotation, bending moment, and shear continuity conditions to derive the displacement and internal force equations of the support pipe.
The calculation results are in close agreement with the measured strain from the project, proving the applicability of the model. Moreover, by analyzing the maximum strain change law of the support pipe, the reasonable pipe roof diameter was selected, using the pipe jacking roof of the Qinhuai New River section as an example.
The research shows that the initial pipe diameter significantly influences the support performance of the bottom support pipe, with this influence gradually decreasing as the pipe diameter increases. The excavation step length and pipe spacing positively impact the support performance, with a more pronounced effect on the maximum strain of the support pipe when the pipe diameter is small. Pipe spacing has minimal effect on the longitudinal strain of the support pipe. The unloading lever of the pipe jacking roof can effectively transfer the unloading value from the excavation area to the unexcavated area, thus ensuring the stability of the excavation surface of the pipe jacking roof.
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