The invention discloses a shield construction overexcavation amount early warning method and early warning device, belongs to the technical field of
tunnel construction, and aims to overcome the defects that in the prior art, overexcavation amount calculation is inaccurate, parameters are difficult to obtain due to dependence, early warning is not associated with actual risks, and man-
machine interaction is insufficient. According to the method,
shield tunneling ring footage is used as a calculation unit, the theoretical
slag discharge amount is calculated by introducing a soil body loose coefficient, the actually measured
slag discharge amount is obtained by adopting contour collection and
belt speed monitoring, and the actual over-excavation amount is obtained by deducting the injection amount; and based on equivalent stratum loss or a
settling tank theory, the over-excavation amount is converted into the maximum settlement amount of the
earth surface, and a two-stage grading early warning mechanism is established. The device comprises a
data acquisition module, a data communication module and a man-
machine interaction module, and realizes accurate
data acquisition, stable transmission and intelligent early warning. According to the method, the over-excavation amount calculation precision is improved, the relevance between early warning and
engineering risks is enhanced, man-
machine interaction is convenient, and the shield construction safety management and
control level can be remarkably improved.