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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摘要开展富水软弱地层中列车荷载作用下盾构隧道动力响应特性研究，以期为盾构隧道结构减振技术及地基土液化评判提供理论依据。采用模型试验与数值模拟相结合的方法，以时域、频域分析为基础，分别以孔隙水压力、频响函数与峰值加速度为评价指标，研究列车振动荷载作用下富水软弱地层中超静孔隙水压力、超静孔隙水压力比的响应规律以及盾构隧道管片结构与周围富水软弱地层的竖向加速度响应规律。研究结果表明：列车荷载作用下，富水软弱地层中的超静孔隙水压力峰值随着测点远离隧道而迅速减小，因此列车振动荷载对隧道周围富水地层的孔隙水压力的主要影响范围较小，主要集中在隧道底部以下约2 m范围内；借助频率响应函数(FRF)将时域结果转化为频域结果，分析发现在列车振动荷载作用的频域区间内，隧道结构与周围富水地层的竖向振动加速度级与荷载频率呈正相关，整体来看，加速度级在低频段(0～80 Hz)内的增幅明显大于中、高频段(80～250 Hz)；相较于低频区段(0～80 Hz)，中、高频区段(80～250 Hz)的振动波衰减更快。

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	周扬
	杨文波
	杨林霖
	钱志豪
	涂玖林
	费虎
	何川

关键词 ：隧道工程, 富水软弱地层, 盾构隧道, 列车振动, 动力响应

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

引用本文:

周扬，杨文波，杨林霖，钱志豪，涂玖林，费虎，何川. 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[J]. 岩石力学与工程学报, 2022, 41(5): 1067-1080.
ZHOU Yang，YANG Wenbo，YANG Linlin，QIAN Zhihao，TU Jiulin，FEI Hu，HE Chuan. Analysis of dynamic response characteristics of shield tunnels in water-rich soft strata under train loads. , 2022, 41(5): 1067-1080.

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http://rockmech.whrsm.ac.cn/CN/10.13722/j.cnki.jrme.2021.0511 或 http://rockmech.whrsm.ac.cn/CN/Y2022/V41/I5/1067

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