Zheng Haizhong, Yan Wujian, Shi Yucheng, et al. 2020. Vibration characteristics and long-term deformation analysis of bridge piers-foundation sites in seasonal frozen soil region under repeated train load[J]. Journal of Engineering Geology, 28(4): 907-915. doi: 10.13544/j.cnki.jeg.2019-219.
    Citation: Zheng Haizhong, Yan Wujian, Shi Yucheng, et al. 2020. Vibration characteristics and long-term deformation analysis of bridge piers-foundation sites in seasonal frozen soil region under repeated train load[J]. Journal of Engineering Geology, 28(4): 907-915. doi: 10.13544/j.cnki.jeg.2019-219.

    VIBRATION CHARACTERISTICS AND LONG-TERM DEFORMATION ANALYSIS OF BRIDGE PIERS-FOUNDATION SITES IN SEASONAL FROZEN SOIL REGION UNDER REPEATED TRAIN LOAD

    • Based on the ground vibration and settlement of track-bridge-pier-seasonal frozen soil site caused by high-speed train operation, we selected a pier and surrounding foundation site of Tieling-Siping section of Harbin-Dalian high-speed railway as the test site. The measured data are analyzed in time domain and frequency domain. And we studied the vibration characteristics of piers and surrounding sites. The results show that the vibration characteristics of bridge pier and foundation site are quite different, and the vibration amplification effect of different foundation site is also significantly different. Combining with the survey, we established the finite element numerical model of pier-foundation site. We analyzed the vibration propagation characteristics of pier and foundation site in different seasons and the stress distribution in the soil of foundation site. We used the accumulated plastic strain model to analyze the settlement and deformation of the foundation site in seasonal frozen soil region under repeated train loads. It is found that the peak vibration acceleration of site decreases with the increase of the distance R from the pier, and the vibration attenuation rate of freezing season is obviously lower than vibration attenuation rate of non-freezing season. The cumulative settlement of the ground surface of the foundation site is the largest where the distance from the bottom of the pier is 0.5 m. The permanent deformation of foundation site caused by train loading increases with the increase of the times of train load, and the deformation tends to be stable with the increase of time as well.
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