Structural Scheme of Metro Station Constructed by Enlarging Large Diameter Shield Tunnel and Stress and Deformation of Its Key Joints

被引：0
|
作者：
Xu X. [1 ]
Li Z. [1 ]
Wang K. [1 ]
He H. [1 ]
机构：
[1] School of Civil Engineering, Beijing Jiaotong University, Beijing
来源：
Zhongguo Tiedao Kexue/China Railway Science | 2021年 / 42卷 / 02期
关键词：
Expanded metro station; Key joint; Large diameter shield tunnel; Station structure; Stress and deformation;
D O I：
10.3969/j.issn.1001-4632.2021.02.08
中图分类号：
学科分类号：
摘要：
The shortcomings of the structural scheme of Jiangtai Station of Beijing Metro Line 14 were analyzed. A tower-column structural scheme of a metro station constructed by enlarging large diameter shield tunnel was proposed. A three-dimensional discontinuous contact model was established to study the stress and deformation of the key joints of tower-column structure. Results show that the construction of the main structures on both sides of shield tunnel and station has significant influence on the opening and dislocation of segment longitudinal joints, but has no obvious influence on the dislocation between the joints of segment rings. The construction of cross passages has little influence on the opening and dislocation of segment longitudinal joints, and the dislocation of ring joints between split ring segments is not obvious. But the dislocation of ring joints between tower-column ring segments and split ring segments increases sharply, and the maximum dislocation value is 2.73 mm. The compressive stress of segment joints increases obviously in the construction stage of expanding excavation, especially in the construction stage of cross passage. Due to the removal of some segments, the compressive stress of joints at the arch waist of tower-column ring segments increases sharply, and the maximum value is 19.31 MPa. The opening and dislocation of the joints between segments and cast-in-situ concrete are not obvious, and the compressive stresses of such joints are also smaller than those of the joints at the same position of tower-column ring segments. Although the shear-axial ratio of the segment joint surface is greater than the friction coefficient of 0.5, the axial tensions of inclined/straight bolts of segment joints are less than the maximum tensile load they can bear, which meets the tensile strength requirements. © 2021, Editorial Department of China Railway Science. All right reserved.
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页码：66 / 76
页数：10
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