双线平行盾构隧道任意布置方式下施工引起的地表沉降预测模型

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中图分类号：U455.43 文献标志码：A 文章编号：2096-6717（2025）03-0113-13

Prediction model of ground settlement caused by construction of double track parallel shield tunnels under arbitrary layout

WANG Chao， ZOU Jinfeng （Schoolof Civil Engineering，Central South University，Changsha 4lOO75，P.R.China）

Abstract： In order to investigate the surface settlement patern caused by construction of a twin parallel shield tunnels in an arbitrary arrangement，a relevant theoretical prediction model needs to be established. Considering the effects of ground soil loss rate and convergence pattrn，the classical two-dimensional Peck model is improved by introducing equivalent soil loss parameters to find the actual burial depth after tunnel convergence， taking circular tunnelas an example.Based on this，a prediction model for surface settlement due to construction of the twin parallel shield tunnels in any arangement is established by considering three main influencing factors， including the angle α between the tunnel axis and the horizontal plane， the radius of the two-lane tunnel （r1，r2） and the tunnel axis distance D . The applicability of the proposed model is verified by the field monitoring and numerical simulation results from engineering practice，and predictive model for surface setlement due to construction of the twin paralel shield tunnels in any arangement is established.The main influencing factors of surface setlement caused by construction under arbitrary arrangement of the twin parallel shield tunnels are analyzed.The results show that the prediction model could be used to solve the surface setlement problem caused by the construction of a two-line paralel shield tunnel in any arrangement，and it meets the engineering accuracy requirement of 20% . The critical parameter values [α，r2/r1，D/H′] for the variation of the surface settlement curve from "V" to "W" are [60∘，2.0，1.0] ，which can be used to make a preliminary judgment on the shape of the surface setlement curve and check the rationality of the surface settlement results.It provides reliable guidance for prediction and control of surface settlement deformation in similar tunnel construction.

Keywords： twin parallel shield tunnel; layout mode; surface settement;prediction model

随着盾构施工水平不断提升，越来越多的城市轨道交通工程采用盾构法施工。（剩余18965字）