A deformation calculation method for shield tunnels considering segment displacement and rotation under ground surcharge

Abstract

The invention relates to a shield tunnel deformation calculation method considering duct piece staggering and rotation at the same time under ground loading. The method comprises the following steps of: establishing a calculation model; calculating a deformation mode of rigid body rotation and duct piece staggering; calculating tunnel additional stress caused by ground loading; calculating total potential energy of a shield tunnel; calculating a displacement function of a shield lining ring; and obtaining a variable control equation. The method has the beneficial effects that a shield tunnel deformation mode which comprehensively considers rigid body rotation and duct piece staggering effects is established; the lining ring is taken as an elastic foundation short beam for connection between a shear spring and a tensile spring; structural characteristics and physical characteristics of the tunnel are sufficiently considered; and longitudinal displacement (such as vertical displacement and horizontal displacement), caused by ground loading, of the tunnel and staggering amounts and inter-ring shearing force between shield tunnel rings can be rapidly calculated by utilizing Matlab, sothat the safety of the tunnel structure under the ground loading can be judged and accords with practical stress and deformation of the shield tunnel.

Description

technical field [0001] The invention relates to a calculation method for calculating the deformation of an underlying shield tunnel caused by ground surcharge by using a new deformation mode of rigid body rotation and segment staggering and the principle of minimum potential energy. It belongs to the technical field of underground engineering. Background technique [0002] When there is surcharge on the upper part of the subway shield tunnel in operation, additional stress will be generated on the underground shield tunnel, which will destroy the original balance of the shield structure and cause stress redistribution in the tunnel, resulting in certain longitudinal and transverse deformations. In severe cases, it will cause Seam opening, segment cracking and bolt failure and other phenomena have a serious impact on subway safety. When analyzing tunnel deformation, the current theoretical analysis methods mostly idealize the tunnel lining ring as a simple rigid body rotatio...

AI Technical Summary

Problems solved by technology

[0002] When there is surcharge on the upper part of the subway shield tunnel in operation, additional stress will be generated on the underground shield tunnel, which will destroy the original balance of the shield structure and cause stress redistribution in the tunnel, resulting in certain longitudinal and transverse deformations. In severe cases, it will cause Seam opening, segment cracking and bolt failure, etc., have a serious impact on subway safety

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