Method for detecting radial stress deformation of shield tunnel duct piece

Abstract

The invention discloses a method for detecting radial stress deformation of a shield tunnel duct piece. Pressure sensor holes formed in an end surface and an annular surface of a duct piece are reserved and an overall annular test duct piece is made; the test duct piece is transported to a construction site; pressure sensors are installed in the pressure sensor holes and are connected with a testing device; after a shield carries out idle pushing normally for 5 to 8 rings, the height of a support body, separated from the shield tail, of a negative annular duct piece is reduced for each ring of5mm in continuous four rings, test duct pieces with the pressure sensors are assembled and are propelled, the height of the support body, separated from the shield tail, of the negative annular ductpiece is increased for each ring of 5mm in continuous four rings until the height reaches a standard value, and radial and circumferential stress changing situations between the test duct pieces underdifferent changing conditions are observed during the propelling process; and then the test result is processed. According to the invention, with the field full-size testing, the radial deformation rule of the formed tunnel duct piece under the effect of the external force is summarized, thereby providing actual measurement data for studying and summarizing the deformation rule of the formed tunnel duct piece under conditions of a water-rich stratum and insufficient synchronous grouting amount.

Description

technical field [0001] The invention relates to the technical field of shield tunnel construction, in particular to a detection method for radial force deformation of a shield tunnel segment. Background technique [0002] Shield construction has become the main construction method of urban rail transit. The stress state of formed shield tunnel segments has only theoretical calculations and laboratory simulation tests. There are no actual measurement cases of segment stress states. During the shield tunneling process, when the formed tunnel segment is in abundant groundwater, insufficient synchronous grouting, or other external forces, there are only limited theoretical simulation calculations and no actual engineering test research on the relationship between the deformation of the segment and the change of the external force. and summary. [0003] With the change of tunnel longitudinal non-uniform deformation, the deformation characteristics of each annular seam, the conve...

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