A Calculation Method for Circumferential Strain of Immersed Tunnel Tube Section Under Tidal Load

Abstract

The invention provides a calculation method of a pipe joint hoop strain of a tide load sinking pipe tunnel. The method includes steps of, assuming a back silt layer on the pipe joint as an impervious bed, and regarding the change of the tide level as a large area load pO added on the impervious bed, wherein the location of an underground level is the top face of the impervious bed; not considering about influence of tide on the pipe joint structure, calculating water, soil pressure and subgrade reaction acted on the outer wall of the pipe joint; applying a winkler foundation module, regarding the loop strain calculation as the plane strain problem; analyzing the loop stress and deformation of the pipe joint structure by a load-structure method; through the calculation of cross model stress of the pipe joint, acquiring the relationship of the loop stress strain relationship of the pipe joint; finally, through calculation, acquiring the loop strain distribution of inner and outer walls of the pipe joint under one tide level and influence of the loop strain of every point of inner and outer walls of the pipe joint along with the change of the tide level. The calculation result can be used for predicting the loop strain of the pipe joint of the sinking pipe tunnel in operation stage, judging the part where may generate crack, and carrying out key monitoring and prevention.

Description

technical field [0001] The invention relates to a method for calculating the circumferential strain of a tube joint of an immersed tube tunnel under tidal load, and belongs to the technical field of underground engineering. Background technique [0002] At present, there are many studies at home and abroad on the dynamic response of immersed tube tunnel pipe joints under the influence of wave loads, but there are few studies on the influence of tidal loads. Research on calculation method of nodal hoop strain. [0003] According to engineering cases at home and abroad, some pipe joints of immersed tube tunnels cracked and leaked during the operation period, which brought great harm to the normal use of the tunnel. Due to the special structural form of immersed tube tunnels, a large number of them are built in large rivers, so the tidal load has a great influence on the strain of pipe joints. In order to explore the influence of tidal loads on the circumferential strain dist...

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