Analysis of dynamic response characteristics of shield tunnels in water-rich soft strata under train loads

被引：0
|
作者：
Zhou Y. [1 ]
Yang W. [1 ]
Yang L. [1 ]
Qian Z. [1 ]
Tu J. [1 ]
Fei H. [1 ]
He C. [1 ]
机构：
[1] Key Laboratory of Transportation Tunnel Engineering of Ministry of Education, Southwest Jiaotong University, Chengdu
来源：
Yanshilixue Yu Gongcheng Xuebao/Chinese Journal of Rock Mechanics and Engineering | 2022年 / 41卷 / 05期
基金：
中国国家自然科学基金; 中央高校基本科研业务费专项资金资助;
关键词：
Dynamic response; Shield tunnel; Train vibration; Tunnelling engineering; Water-rich soft stratum;
D O I：
10.13722/j.cnki.jrme.2021.0511
中图分类号：
学科分类号：
摘要：
This paper studies the dynamic response characteristics of shield tunnels in water-rich soft strata under train loads, aiming to provide a theoretical basis for vibration damping of shield tunnels and liquefaction evaluation of foundation soils. Adopting the method of combining model tests and numerical simulations and taking the pore water pressure, the frequency response function and the peak acceleration as the evaluation indexes, the response laws of the excess pore water pressure and the excess pore water pressure ratio in water-rich soft strata, as well as the vertical acceleration response laws of the shield tunnel segment structure and the surrounding water-rich soft strata under train vibration loads were studied based on time domain and frequency domain analyses. The results show that with the measurement point moving away from the tunnel, the peak value of the excess pore water pressure in the water-rich soft stratum under the train load decreases rapidly. The main influence range of the train vibration load on the pore water pressure of the water-rich stratum around the tunnel is small, which is mainly observed in the range of about 2m below the arch bottom of the tunnel. Through transforming the time-domain results into the frequency domain results by the frequency response function(FRF), it is found that in the frequency domain of the train vibration load, the vertical vibration acceleration level of the tunnel structure and the surrounding water-rich soft strata is positively correlated with the load frequency. Overall, the vibration acceleration level increases more significantly in the low frequency zone(0-80 Hz) than in the medium and high frequency zone (80-250 Hz), and the vibration wave attenuation is more significant in the medium and high frequency zone(80-250 Hz) than in the low frequency zone(0-80 Hz). © 2022, Science Press. All right reserved.
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页码：1067 / 1080
页数：13
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