Method for correcting unconformable surface stratum shield tunneling construction

Abstract

The invention relates to the technical field of tunnel shield construction, in particular to a method for correcting the unconformable surface stratum shield tunneling construction, and solves the difficult problems of difficulty in correction, long construction period, influence on normal traffic and the like of an existing method. The method comprises the following steps of: enlarging a shield excavation diameter; when shield posture deviation exceeds 5cm, injecting high pressure water with a dispersing agent from a radial grouting hole of a middle shield at the deviated side of a shield body; and when the shield body is deviated by 10cm, constructing a grotto in the deviation reverse direction of a cutter head on an excavation face, adding an auxiliary oil cylinder behind a shield tail at the deviated side of the shield, starting a driving oil cylinder to recover tunneling, and when the driving oil cylinder drives for 30cm every time, pouring polyurethane by the radial grouting hole of the middle shield at the deviated side of the shield. Flexibility of shield posture correction is improved; the rate of shield posture deviation is reduced; the grotto is constructed in the reverse direction of the shield deviation; a correction space is provided; the polyurethane is poured by the radial grouting hole of the middle shield so as to implement forced correction; the method has the advantages of simple process, flexibility for controlling the construction process, advanced technology and the like and excellent economic benefits and social benefits can be obtained.

Description

technical field

[0001] The invention relates to the technical field of tunnel shield construction, in particular to a deviation correction method for shield excavation construction in unconformity surface strata. Background technique

[0002] With the rapid development of subway rail transit, the proportion of shield construction in interval tunnels has exceeded 90%. However, the complex strata of a certain period are missing between successively deposited strata, resulting in the discontinuity of the age of the upper strata. , there is an unconformity surface between the upper and lower strata, there is a certain angle between the unconformity surface and the tunnel, and the strength difference between the upper and lower strata makes it difficult to control the posture of the shield. No matter how it is controlled, the shield posture will still deviate along the unconformity surface during excavation.

[0003] During construction, due to the particularity of the unconf...

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