小曲率半徑盾構(gòu)隧道施工階段管片水平軸線偏移預(yù)測模型

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中圖分類號：U455.43 文獻標志碼：A 文章編號：2096-6717（2025）03-0126-16

Prediction model for horizontal axis deviation of segment during construction stage of small curvature radius shield tunnel

ZHU Chunzhou （China Railway Shanghai Design Institute Group Co.，Ltd.，Shanghai 2Ooo4O，P.R. China）

Abstract：In order to find out the horizontal axis ofset lawofthe tube sheet caused bysmallcurvature radius shield tunnel construction，and to prevent the occurrnce of undesirable phenomena such as tube sheet misplacedbreakage.Based on the modifiedlongitudinal equivalent continuity model，the elipticized deformation of tunnel convergence and the influence of comprehensive factors of curved tunnels are considered. Byconstructing the deflection differential equation of the Winkel foundation beam under the condition of small curvature radius，the prediction model of horizontal axis offset of the tube sheet in theconstruction stage of small curvature radius shield is established.The engineering applicability of the prediction model is verified by relying on the shield tunnel project of Nanchang City Railway Line 3.The results show that： when the tube sheet is assembled within 6 rings，the maximum error between the theoretical value of the prediction model and the monitoring and simulation values is 13.36% and 25.68% ，respectively. The maximum errors between the theoretical values and the monitored and simulated values are 4.91% and 8.95% ，respectively，when the pipe pieces are assembled in the range of7to 22 rings.The theoretical，simulated and monitored values of the tube sheetassembled in the 3Oth ring are -20.562mm ， -22.370mm and -20.949mm respectively，and the error between the theoretical and monitored values is less than 5% ，and the overall trend is basically the same，which can efectively solve the problem of calculating the horizontal axial deviationof the tube sheet in the construction of shield tunnel under the condition of small radius of curvature.

Keywords： small curvature radius tunnel； shield tunneling；segment；beams on Winkler foundation： differential equation for deflection;axis of pipe segments;prediction model

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