Study on mechanical behavior of metro shield tunnel under complex conditions

被引：0
|
作者：
Li C. [1 ,2 ]
Wang F. [1 ]
Zhang L. [1 ]
Wang J. [1 ]
机构：
[1] School of Transportation Science and Engineering, Jilin Jianzhu University, Changchun
[2] School of Transportation, Jilin University, Changchun
来源：
Wang, Jing (wangjing0062@sina.com) | 1600年 / Science Press卷 / 38期
关键词：
Complicated geological conditions; Double parameter elastic foundation beam; Longitudinal stress; Metro shield tunnel; Variable stiffness;
D O I：
10.3969/j.issn.1001-8360.2016.05.016
中图分类号：
学科分类号：
摘要：
In order to study the longitudinal mechanical behavior of the subway shield tunnel under complex conditions, the longitudinal mechanical model of the subway shield tunnel was established based on the two-parameter elastic foundation theory and the state space theory, where the characteristics of internal force and deformation were analyzed with the shear deformation effect of soil body taken into account, when the subway shield tunnel of longitudinal different stiffness crosses complex geological conditions. The results showed that the cross section of the tunnel in the interface between hard soil layer and the soft soil layer is most prone to damage as a result of reduced mechanics performance arising from the sudden change to the internal force and deformation of the shield tunnel when the subway shield tunnel passes through the hard soil layer and enters the soft soil layer. The large settlement can be offset by increasing the longitudinal stiffness of shield tunnel in the soft soil. The longitudinal internal forces were re-distributed after the shield tunnel was damaged or reinforced. The greater the local stiffness damage was, the greater the increment of the deflection and the slope of the shield tunnel. At the same time, the internal forces were unloaded in the local stiffness damage sections. The model established in this paper can be used for the safety monitoring and design optimization of the metro shield tunnel under complex soil conditions. © 2016, Science Press. All right reserved.
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页码：103 / 109
页数：6
相关论文
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