车致振动荷载作用下富水软弱地层中盾构隧道动力响应分析

doi:10.13722/j.cnki.jrme.2021.0511

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Abstract 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 2 m 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).

Key words： tunnelling engineering water-rich soft stratum shield tunnel train vibration dynamic response

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	ZHOU Yang
	YANG Wenbo
	YANG Linlin
	QIAN Zhihao
	TU Jiulin
	FEI Hu
	HE Chuan

Cite this article:

ZHOU Yang,YANG Wenbo,YANG Linlin, et al. Analysis of dynamic response characteristics of shield tunnels in water-rich soft strata under train loads[J]. , 2022, 41(5): 1067-1080.

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https://rockmech.whrsm.ac.cn/EN/10.13722/j.cnki.jrme.2021.0511 OR https://rockmech.whrsm.ac.cn/EN/Y2022/V41/I5/1067

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