Effect of longitudinal joints on seismic response of the large shield tunnel in liquefiable soils
Effect of longitudinal joints on seismic response of the large shield tunnel in liquefiable soils
复制标题
液化土中大型盾构隧道纵向缝对地震响应的影响
DOI：
--
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发表时间：
2015-06
影响因子：
1
通讯作者：
Yang Dian-Sen
中科院分区：
文献类型：
--
作者：
Zhao Wu-Sheng;Chen Wei-Zhong;Yang Dian-Sen
针对近年来盾构隧道在强震中的破坏情况，重点研究了纵缝对软土中盾构隧道地震反应的影响。首先，通过单调荷载和循环荷载作用下高强混凝土节点的直剪试验，研究了节点处高强混凝土界面的正剪和抗剪性能。结果表明，影响界面行为的主要因素是界面的平整度而不是粗糙度。随着围压和循环次数的增加，总接触面积增加，从而导致法向刚度和摩擦系数的增加。基于试验结果，采用数值分析方法对软土中盾构隧道的地震反应进行了研究。结果表明，纵缝对盾构隧道的地震响应有显著影响。当不考虑接头时，混凝土中的拉应力、隧道隆起和地表变形均显著减小，盾构隧道的抗震能力降低。由于土体液化，盾构隧道腰部附近的接头更容易开裂，相应的螺栓承受较大的拉力，这是盾构隧道常见病害的主要原因。通过试验和数值模拟研究，对大型盾构隧道的接头效应和地震破坏有了更好的认识，为大型盾构隧道抗震设计规范的制定迈出了重要的一步。
In view of the damages to shield tunnels in recent strong earthquakes, this paper focuses on the effect of longitudinal joints on the seismic response of the shield tunnel in liquefiable soils. First, the normal and shear behaviors of high-strength concrete interface at the joint were studied through direct shear tests under monotonic and cyclic loadings. The results show that the flatness rather than the roughness is the dominant factor influencing the behavior of the interface. As the confining stress and cyclic number increase, the total contact area increases, thus resulting in the increases of the normal stiffness and the friction coefficient. Based on the testing results, the seismic response of a shield tunnel in liquefiable soils was studied using numerical analysis. According to the results, the longitudinal joints have a significant effect on the seismic response of the shield tunnel. When neglecting the joints, the tensile stresses in concrete, the tunnel uplift and the surface deformation remarkably decrease, and the shield tunnel becomes less vulnerable to earthquakes. Due to the soil liquefaction, the joints located near the waist are more likely to get opened and corresponding bolts bear large tensile forces, which are the main reasons for the common damages to shield tunnels. Based on this experimental and numerical study, the effect of the joints and the seismic damages of the large shield tunnel are better understood, consisting an important step in the development of appropriate specifications for the seismic design of the large shield tunnel.
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DOI：
10.1061/(asce)0733-9445(1998)124:12(1418
发表时间：
1998-12-01
期刊：
JOURNAL OF STRUCTURAL ENGINEERING-ASCE
影响因子：
--
作者：
Fronteddu, L;Leger, P;Tinawi, R
通讯作者：
Tinawi, R
DOI：
--
发表时间：
2009
期刊：
Chinese Journal of Geotechnical Engineering
影响因子：
--
作者：
Li Xing-long
通讯作者：
Li Xing-long
影响因子：
6.9
作者：
M. Azadi;S. Hosseini
通讯作者：
M. Azadi;S. Hosseini
影响因子：
4
作者：
Saeedzadeh, Reza;Hataf, Nader
通讯作者：
Hataf, Nader
影响因子：
3.7
作者：
S. Unjoh;M. Kaneko;S. Kataoka;K. Nagaya;Kazunari Matsuoka
通讯作者：
S. Unjoh;M. Kaneko;S. Kataoka;K. Nagaya;Kazunari Matsuoka