Prediction method for vertical deformation of existing subway tunnel adjacent to foundation pit engineering

Abstract

The invention discloses a prediction method for vertical deformation of an existing subway tunnel adjacent to foundation pit engineering. The prediction method comprises: monitoring a foundation pit and a tunnel structure adjacent to the foundation pit laterally, and analyzing vertical displacement characteristics of an enclosure structure and the tunnel structure; recording a cumulative verticaldisplacement measured value of the enclosure structure as dw and a cumulative vertical displacement measured value of the tunnel structure as dt, taking the axial direction of the tunnel as an x-axisdirection, taking the position of a first monitoring point as an x-axis zero point, taking the monitoring data of each monitoring point as a data point, and drawing distribution curves of dw and dt along with the axial position of the tunnel; recording the horizontal distance between the enclosure structure and the adjacent ascending and descending tunnels as L; drawing a relation curve of dt and1000dw/L by considering the influence of L on the deformation correlation of the enclosure structure and the tunnel to obtain dt = Aln (1000dw/L) + B; obtaining dt' of different axial positions of thetunnel by utilizing dt'= Alg (1000dw/L) + B; and drawing a distribution curve of dt and dt' along the axial direction of the tunnel, calculating a prediction error, and evaluating a prediction effect.

Description

technical field [0001] The invention relates to a prediction method, in particular to a prediction method for the vertical deformation of an existing subway tunnel adjacent to a foundation pit project. Background technique [0002] With the development of the city and the gradual density of the subway traffic network, there are more and more cases of foundation pits being excavated above or on the side of the subway tunnel. Therefore, research on the impact of foundation pit excavation on existing subway structures has attracted widespread attention. [0003] At present, there are mainly three methods for predicting the deformation of subway tunnels adjacent to the foundation pit engineering: theoretical derivation, numerical simulation and actual measurement analysis. (1) Theoretical research on the deformation of adjacent tunnels caused by excavation of foundation pits is generally carried out in two stages. First, based on the Mindlin solution, the additional stress or a...

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Problems solved by technology

However, most of the current measurement methods focus on the influence of different factors on the deformation of adjacent tunnels, ignoring the relationship between the deformation of the foundation pit itself and the deformation of adjacent tunnels

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