A deflection correction and reinforcement method for shield tunneling

Abstract

The invention discloses a rectifying and reinforcing method of shield tunnels. The method comprises the following steps: A, evaluating safety of the shield tunnels to be rectified and reinforced to obtain current pipe segment stress state; B, executing the step C when the current pipe segment stress state meets the requirements of specification and structural calculation; executing the step C after the stress of the shield tunnels to be rectified and reinforced is released when the current pipe segment state has been in the critical state or has been out of the limit; C, determining main deforming and readjusting directions and secondary deforming and readjusting directions according to main deviation directions of the tunnels; and D, firstly grouting and rectifying the main deforming and readjusting directions, and then grouting and rectifying the secondary deforming and readjusting directions again. Through the adoption of the rectifying and reinforcing method of the shield tunnels, the operated metro shield tunnels with large-range settlement deviation in the reclamation areas can be effectively rectified and reinforced.

Description

technical field [0001] The invention relates to the technical field of underground engineering, in particular to a deflection correction and reinforcement method for a shield tunnel. Background technique [0002] With the expansion of the city, the excavation of deep foundation pits of buildings around the reclamation area of ​​coastal cities and the existing subway tunnels is gradually increasing. Due to the particularity of the stratum and development and construction of the reclamation area, the excavation of the foundation pits of the surrounding buildings causes less rigidity Accidents of large-scale settlement and deflection of shield tunnels are also gradually increasing. For subway tunnels that have been in operation, it is extremely difficult to rectify and reinforce them on a large scale. The current prior art has not yet formed a systematic and effective solution. method. Contents of the invention [0003] In view of this, the present invention provides a defle...

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Problems solved by technology

[0002] With the expansion of the city, the excavation of deep foundation pits of buildings around the reclamation area of ​​coastal cities and the existing subway tunnels is gradually increasing. Due to the particularity of the stratum and development and construction of the reclamation area, the excavation of the foundation pits of the surrounding buildings causes less rigidity Accidents of large-scale settlement and deflection of shield tunnels are also gradually increasing. For subway tunnels that have been in operation, it is extremely difficult to rectify and reinforce them on a large scale. The current prior art has not yet formed a systematic and effective solution. method

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