Improved stochastic medium theoretical model for predicting deformation of existing tunnels and strata caused by excavation of new undercrossing tunnels

被引：0

作者：

Xu Q. ^{[1
,2
]}

Zhu Y. ^{[1
,2
]}

Lei S. ^{[1
,3
]}

Liu Y. ^{[1
]}

Zhao W. ^{[4
]}

Fang Z. ^{[1
]}

Wang C. ^{[1
]}

Xu S. ^{[1
]}

机构：

[1] School of Civil Engineering, Shijiazhuang Tiedao University, Shijiazhuang

[2] State Key Laboratory of Mechanical Behavior and System Safety of Traffic Engineering Structures, Shijiazhuang Tiedao University, Shijiazhuang

[3] China Railway Construction Corporation Limited, Beijing

[4] China Railway 18th Bureau Group Co., Ltd., Tianjin

来源：

Yantu Gongcheng Xuebao/Chinese Journal of Geotechnical Engineering | 2023年 / 45卷 / 02期

关键词：

equivalent bending rigidity; equivalent layer method; heterogeneous stratum; stochastic medium theory; undercrossing;

D O I：

10.11779/CJGE20211447

中图分类号：

学科分类号：

摘要：

During the construction of new tunnels undercrossing the existing tunnels, the predicted results of the stratum deformation are prone to large errors since the traditional stochastic medium theory cannot consider the influences of the existing tunnel. Considering the non-uniform convergence of the tunnel section after excavation, the traditional stochastic medium theory is simplified and improved based on the relationship between the key parameters of the stochastic medium theory and those of the Peck's formula. The heterogeneous strata and existing tunnels are equated by applying the bending stiffness of an existing tunnel and the equivalent layer method. A prediction model for the deformation of the existing tunnels and strata caused by the excavation of new undercrossing tunnels is proposed, and based on the relevant typical project, its accuracy is validated. The results show that compared with those of the traditional stochastic medium theory, the predicted curves of the proposed model are "wide and shallow" and have a greater correlation with the numerical calculations and the field measurements, and they have a higher rationality and accuracy, which may provide a theoretical basis for the prediction of the deformation of the existing tunnels and strata caused by the excavation of undercrossing tunnels. © 2023 Chinese Society of Civil Engineering. All rights reserved.

引用

页码：301 / 309

页数：8

共 16 条

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