Method for predicting influence of construction of pipe-jacking tunneling machine on safety of overlying pipeline

Abstract

The invention discloses a method for predicting the influence of construction of a pipe-jacking tunneling machine on the safety of an overlying pipeline. The method comprises the following steps of: firstly, sequentially determining the equivalent width b0 of a cutterhead of the tunneling machine and a horizontal additional stress expression p (z) generated by the cutterhead of the tunneling machine when the cutterhead of the tunneling machine cuts a soil body according to the diameter B0 of the cutterhead of the pipe-jacking tunneling machine and the soil pressure p0 applied by the cutterhead of the tunneling machine when the cutterhead of the tunneling machine cuts the soil body; then, determining the allowable tensile strength [sigma t] of the pipeline material, the maximum tensile stress sigma t generated by the cutterhead of the heading machine to the pipeline and the maximum deformation delta generated by the cutterhead of the heading machine to the pipeline; and finally comparing [sigma t], sigma t and delta, and judging the safety influence of the cutterhead of the heading machine on the pipeline. By means of the method, the method for predicting the influence of construction of the pipe-jacking tunneling machine on the safety of the overlying pipeline is reliable in prediction effect and accurate in prediction result.

Description

technical field [0001] The invention relates to the field of infrastructure construction, in particular to a method for predicting the impact on the safety of an overlying pipeline during the construction of a pipe jacking machine. Background technique [0002] In underground pipeline construction, pipe jacking machine construction is often used in underground construction because of its advantages such as less interference to the ground, fast construction speed, and reasonable cost. However, in the urban underground space, the pipelines are dense, and sometimes the distance between the pipe jacking machine and the overlying pipeline is relatively close, and the plane projection intersects. At this time, the roadheader exerts pressure on the soil in front, and horizontal stress is generated at the overlying soil and the pipeline. Under the action of this stress, additional stress and deformation are generated inside the pipeline. If the additional stress is too large, or the...

AI Technical Summary

Problems solved by technology

So far, there is no relevant method to predict the impact on the safety of the overlying pipeline during the construction of the pipe jacking machine

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