地震高烈度区软岩隧道结构动力响应特性研究

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Abstract Research purposes: In order to study the basic law of dynamic acceleration response of soft rock tunnel in high seismic intensity area under earthquake action, shaking table test of 1 ∶50 scale tunnel model was designed and carried out on the background of Jiedexiu No.2 tunnel project of Lasa-Linzhi Railway. Through input white noise, EL wave and the wave of Wenchuan, the dynamic response of model structure is tested, the change rule of peak acceleration amplification coefficient of various points with the change of height and different seismic intensity is analyzed, the power spectrum is obtained by fast Fourier change spectrum curve, the acceleration dynamic characteristics of the model structure are analyzed, the acceleration response curves in frequency domain under various loading conditions are compared, and the basic law of dynamic response in frequency domain of the model structure is studied.
Research conclusions:(1) The site elevation effect of soft rock tunnel in high seismic intensity area is different from that of general site. (2) With the increase of ground motion amplitude, the peak acceleration amplification coefficient of each measuring point shows a decreasing trend, and shows a maximum value under 0.15g acceleration excitation. The influence of seismic wave excitation with different frequency characteristics on the elevation effect form is basically the same, and the seismic response at the inverted arch is the largest. When conducting tunnel seismic fortification, the seismic measures at the inverted arch should be strengthened. (3) The amplification effect of surrounding rock soil on acceleration is obvious, but the amplification effect of tunnel lining structure on acceleration is not obvious. The response characteristics of stratum largely determine the seismic response characteristics of lining structure. (4) The power spectral density curve shows that the response peaks of the model structure under different seismic waves are similar, but the corresponding frequency values are different. The high frequency seismic waves have little influence on the lining structure, and the low frequency seismic waves have great influence on the lining structure. (5) The research results can provide a theoretical reference for the seismic design and construction of tunnels in high seismic intensity areas.

Key words： soft rock tunnel shaking table test acceleration response spectrum curve

Received: 18 February 2022

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U25

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	Articles by authors
	LI Renqiang
	MA Zhigang
	YI Zhongqiang
	ZHU Baolong
	WU Honggang

Cite this article:

LI Renqiang,MA Zhigang,YI Zhongqiang, et al. Research on the Dynamic Response Characteristics of Soft Rock Tunnel Structure in High Seismic Intensity Area[J]. Journal of Railway Engineering Society, 2022, 39(9): 56-63.

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https://tdgcxb.crec.cn/EN/ OR https://tdgcxb.crec.cn/EN/Y2022/V39/I9/56

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