Evaluation method for grouting deviation correction effect for horizontal deformation of shield tunnel

Abstract

The invention discloses an evaluation method for a grouting deviation correction effect for horizontal deformation of a shield tunnel, and the method comprises the steps: building a grouting volume expansion mechanical calculation model, and deducing a calculation formula of the simplified horizontal additional stress of any point in a soil layer caused by grouting based on a mirror image method;with a grouting area uniform expansion model, obtaining the volume of a grouted soil body after expansion according to the amount of grout injected into a sleeve valve pipe and the volume expansion rate of a grouting ring, and substituting the volume into the calculation formula to obtain the horizontal additional stress of a to-be-corrected tunnel; substituting the horizontal additional stress ofthe to-be-corrected tunnel into a tunnel horizontal displacement formula through a tunnel shearing dislocation and rigid body rotation collaborative deformation calculation model, so as to obtain thetunnel horizontal displacement correction amount of any point in the calculation range; and performing evaluating according to the horizontal displacement deviation rectifying amount of the tunnel, referring to the I-level control standard in Technical Regulations for Safety Protection of Urban Railway Traffic Structures, if the deviation axis center of the tunnel is less than 5mm, determining that the tunnel deviation is reasonable, otherwise, determining that the tunnel deviation is unreasonable.

Description

technical field [0001] The invention belongs to the technical field of underground engineering, and particularly relates to a method for evaluating the effect of grouting correction for the horizontal deformation of shield tunnels, which is suitable for projects using sleeve valve pipes for soil layer grouting correction, and is used for evaluating the effect of compensation grouting on both Working conditions with the effect of tunnel horizontal displacement rectification control. Background technique [0002] With the development of subway cities, the safety requirements of subway tunnels are getting higher and higher, and they are susceptible to horizontal displacement due to the excavation of side foundation pits. Sleeve valve pipe grouting technology is often used in projects for micro-disturbance grouting correction. The compensation grouting method is a relatively mature deviation correction technology, which is often used in the settlement control of tunnels and the ...

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Problems solved by technology

[0005] The purpose of the present invention is to provide a method for evaluating the effect of grouting correction for the horizontal deformation of shield tunnels, so as to solve the problems of existing numerical simulation methods, measured data analysis methods, and reduced-size model experimental methods for horizontal deformation of shield tunnels. Problems Existing in Evaluation of Grouting Correction Effect

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