• 全国中文核心期刊
  • 中国科技核心期刊
  • 美国工程索引(EI)收录期刊
  • Scopus数据库收录期刊
陈轩, 熊仲明, 陈帜. 地裂缝场地地铁车站动力响应振动台试验研究[J]. 岩土工程学报, 2022, 44(2): 384-391. DOI: 10.11779/CJGE202202021
引用本文: 陈轩, 熊仲明, 陈帜. 地裂缝场地地铁车站动力响应振动台试验研究[J]. 岩土工程学报, 2022, 44(2): 384-391. DOI: 10.11779/CJGE202202021
CHEN Xuan, XIONG Zhong-ming, CHEN Zhi. Shaking table tests on seismic response of a subway station structure in ground fissure site[J]. Chinese Journal of Geotechnical Engineering, 2022, 44(2): 384-391. DOI: 10.11779/CJGE202202021
Citation: CHEN Xuan, XIONG Zhong-ming, CHEN Zhi. Shaking table tests on seismic response of a subway station structure in ground fissure site[J]. Chinese Journal of Geotechnical Engineering, 2022, 44(2): 384-391. DOI: 10.11779/CJGE202202021

地裂缝场地地铁车站动力响应振动台试验研究

Shaking table tests on seismic response of a subway station structure in ground fissure site

  • 摘要: 地震和地裂缝耦合作用严重威胁着地铁工程的安全。通过开展地裂缝场地(穿越地裂缝)地铁车站结构模型的振动台试验,分析了地震作用下地裂缝场地土的加速度反应、裂缝发展和车站的加速度、应变等动力反应规律。试验结果表明:模型土在临近地裂缝的一定范围内地震响应较大,且距地裂缝相同距离处,上盘的加速度响应整体上大于下盘;地裂缝场地地铁车站峰值加速度沿结构高度的分布规律与地震强度有关,即小震作用下结构峰值加速度呈现随结构高度增大而增大的倒三角分布,强震作用下则呈现顶部和底部较大、中部相对较小的“K”型分布;地裂缝场地地铁车站地震破坏模式是地裂缝场地水平剪切变形和竖向上、下盘的错动作用使结构产生明显变形,中柱发生严重的剪压破坏,侧墙与楼板连接处出现一定的受拉损伤,从而导致结构失效;考虑竖向地震作用后,地裂缝场地地铁车站破坏更为严重,这是由于竖向地震增大了地裂缝场地动力放大效应和上、下盘错动作用。

     

    Abstract: The safety of subway is seriously threatened by the coupling effects of earthquakes and ground fissures. A shaking table test is conducted on a subway station structure in a ground fissure site (structure crossing the ground fissure), and the acceleration response and crack development of model soil with the ground fissure as well as the acceleration response and strain response of the subway station are analyzed. The results demonstrate that the seismic response of the model soil is larger near the ground fissure in a certain range, and the acceleration response of the hanging-wall is larger than that of the footwall with the same distance from the ground fissure. The distribution of the peak acceleration along the height for the subway station in the ground fissure site is related to earthquake intensities. Under small ground motions, the peak acceleration increases with the height of the structures (inverted triangle distribution). Under strong ground motions, the peak acceleration is larger at the top and bottom slabs while smaller at the middle slab ("K"-type distribution). The seismic damage mode of the subway station structure in the ground fissure site is the obvious deformation caused by horizontal shear displacement and the dislocation between the hanging-wall and the footwall. The central column has a serious compression-shear failure, and the connection of the side wall and the roof exhibits tensile damage, resulting in the failure of the underground structures. Because the vertical earthquake increases the dynamic amplification effect and aggravates the dislocation action between the hanging-wall and the footwall in the ground fissure site, the subway station in the ground fissure site is damaged more seriously.

     

/

返回文章
返回