岩土工程学报2023，Vol.45Issue(z2)：13-18,6.DOI:10.11779/CJGE2023S20011
地面出入式盾构隧道动力响应试验对比分析
Shaking table tests on ultra-shallowly embedded shield tunnels with ground-penetrating technology
摘要
Abstract
The dynamic response of the ultra-shallowly embedded tunnels,such as ground penetrating shield tunnels(GPSTs),is markedly different from that of the conventional one.Since GPST is partially exposed above the ground surface and partially submerged,it is crucial to investigate its seismic response.The preliminary results of a series of large-scale 1g shaking table tests,conducted at Tongji University,are discussed.A large-scale tunnel-soil model is developed to accurately reproduce the tunnel joints,the cross-sectional and longitudinal stiffness of the tunnel,and the key soil parameters of the prototype problem.The model tunnel has a total length of 7.7 m,with the embedded depth ranging from-0.5D to 0.5D,where D is the tunnel diameter,while the negative values indicate that the tunnel crown is above the ground surface.The Shanghai artificial synthetic wave is applied as seismic excitation in the transverse direction.Two types of tunnels,standard lining and open-crown lining,are tested.The study focuses on analyzing the acceleration response and the ovaling deformation of the tunnel,to learn the dynamic characteristics of GPST.The results reveal a strong effect of embedment depth on tunnel seismic response.The decrease of embedded depth leads to a significant increase of accelerations.The tunnel exhibits a"whiplash effect",leading to strong shaking of the above-ground lining.The ovaling deformation increases with the embedded burial depth.Overall,the response of the underground lining(D≥0)is governed by soil-structure interaction(SSI),whereas the above-ground structure(D＜0)exhibits a pronounced whiplash effect due to the absence of soil confinement.Such effects need to be properly considered in the seismic design of GPST.关键词
盾构隧道/振动台试验/地面出入/动力响应/浅埋隧道Key words
shield tunnel/shaking table test/ground penetrating/seismic response/shallowly embedded tunnel分类
土木建筑引用本文复制引用
王祺,袁勇,禹海涛,刘涛..地面出入式盾构隧道动力响应试验对比分析[J].岩土工程学报,2023,45(z2):13-18,6.基金项目
上海市科学技术委员会课题(22DZ1203005,21DZ1202803) （22DZ1203005,21DZ1202803）
