|
|
|
| Experimental study on seismic response of shield tunnel |
| GENG Ping1, HE Chuan1, ZHANG Jing2, HE Yue1, GUO Xiangyu1, CHEN Pingliang1, WANG Qi1, YANG Qi1, CHEN Changjian1
|
1. MOE Key Laboratory of Transportation Tunnel Engineering, Southwest Jiaotong University, Chengdu 610031, Sichuan, China;
2. China Railway First Survey and Design Institute Group Co., Ltd., Xian 710043, Shaanxi, China |
|
|
|
|
Abstract When encountering strong earthquake, geological conditions or structural stiffness mutation, serious earthquake damage may occur to shield tunnel, and the earthquake damage mainly concentrates on the joints. Through shaking table test and indoor static test, a series of studies were carried out for the weak seismic parts or conditions such as the shield tunnel passing through the soft and hard interface stratum, the joint of cross passage and the longitudinal. The results showed that the seismic response of the shield tunnel in the hard-soft interface stratum still had followability, but showed a “double peak” phenomenon, and the larger internal force response values were distributed in the range of 2.5 times the tunnel diameter on both sides of the stratigraphic interface. The connection stiffness of shield tunnel and transverse passage had an effect on mechanical response of tunnel, and the influence range of rigid connection on the main tunnel was about 3 times of the width of a cross passage, and it was reduced to 1.5 ~ 2 times in the case of flexible connection. The longitudinal joints of shield tunnel mainly bear axial tension or pressure under the seismic. The segments on the bolt hole side and sleeve side were dominated by compressive strain and tensile strain, respectively. The failure test showed that the sleeve and the segment constitute a destructive chain. The sleeve and the segment exhibit slip failure and tension crack failure, respectively. The research can provide a reference for seismic design of shield tunnel.
|
|
Published: 04 November 2020
|
|
|
|
|
|
|
|
