Closed solutions to soil displacements induced by twin-tunnel excavation under different layout patterns

被引：0
|
作者：
Zhang Z.-G. [1 ,2 ,3 ]
Zhang C.-P. [2 ]
Xi X.-G. [1 ]
机构：
[1] School of Environment and Architecture, University of Shanghai for Science and Technology, Shanghai
[2] Key Laboratory of Urban Underground Engineering of Ministry of Education, Beijing Jiaotong University, Beijing
[3] State Key Laboratory for Geomechanics and Deep Underground Engineering, China University of Mining and Technology, Xuzhou
来源：
Yantu Gongcheng Xuebao/Chinese Journal of Geotechnical Engineering | 2019年 / 41卷 / 02期
关键词：
Complex variable; Displacement-controlled Schwarz alternating method; Oval deformation contraction boundary; Soil displacement; Twin-shield tunnel;
D O I：
10.11779/CJGE201902003
中图分类号：
学科分类号：
摘要：
The existing theoretical researches on deformation of soils caused by twin-tunnel excavation are generally based on the linear superposition of single tunneling results and seldom consider the interaction effects between the two tunnels. Based on the displacement-controlled Schwarz alternating method and the complex variable function theory, and considering the oval deformation contraction boundary condition of tunnel opening, a method is proposed to analyze the deformation of the surrounding soils caused by twin-shield tunnel excavation in arbitrary position in order to reveal the interaction influences for the closed underground excavation. The method is based on the displacement boundary condition, which reflects the interaction between the twin tunnels during excavation. Through experiments and engineering cases, the theoretical solutions to the complex variable function based on the displacement-controlled Schwarz alternating method are obtained and compared with those of the linear superposition method and the measured data. The deformation influence laws of ground, which are caused by the variation of space between twin tunnels under two different layout patterns, horizontal and oblique, are acquired through parameter analyses. The results indicate that the surface settlement curve obtained by the complex variable function method based on the displacement-controlled Schwarz alternating method is in good agreements with the measured one, while the linear superposition method has a comparatively large error. Analysis of the laws of contour map indicates that in parallel and oblique positions, the contours of the soil around the twins tunnel produce the obvious "attracting" phenomenon, and the settlement peak line above the tunnels is inclined to the centre of the twin tunnels, but with the increase of the spacing between the twin tunnels, the phenomenon of "attracting" is gradually weakened. The research results may provide some theoretical basis for the protection measures of twin-shield tunnel excavation. © 2019, Editorial Office of Chinese Journal of Geotechnical Engineering. All right reserved.
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页码：262 / 271
页数：9
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