Seismic response analysis of rock tunnel near-portal under oblique incidence of P wave&nbsp; and SV wave

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Journal of Vibration and Shock ›› 2022, Vol. 41 ›› Issue (24) : 278-286.

Seismic response analysis of rock tunnel near-portal under oblique incidence of P wave and SV wave

ZHANG Dongdong1, LIU Yang2, XIONG Feng1, MEI Zhu2, LI Shuang3

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Abstract

The existing coupling boundary simulation method has the problem that the displacement field of the model changes greatly, which affects the accuracy of the seismic response analysis results of tunnel structures under oblique incidence of seismic waves, while the static-dynamic coupling effect is simulated by artificial boundary transformation method. In this paper, an improved method of artificial boundary transformation using repeated static analysis is proposed, which makes the initial state of dynamic analysis of finite element model consistent with the stress state and displacement field of static analysis, and the static-dynamic coupling analysis is realized. A numerical seismic analysis model under oblique incident P wave and SV wave was established using ABAQUS software. The reliability of the model and method was verified through an example. A series of nonlinear time-history analysis were carried out, and the influences of oblique incidence of P wave and SV wave on the seismic response of tunnel lining structure were compared and analyzed. The results show that the consistency of displacement displacement field of tunnel can be ensured in the transformation of artificial boundary by the method. With the increment of the incident angle, the horizontal acceleration of the structure first increases and then decreases. While the vertical acceleration shows a decreasing trend under the action of P wave. Under the action of SV wave, both the horizontal acceleration and the vertical acceleration show an increasing trend. When the incident angle is larger than 20°, compared with P wave oblique incidence, the stress level of arch shoulder and arch foot under SV wave oblique incidence is higher; The damage degree of tunnel structure under oblique incident SV wave is higher than that under oblique incident P wave.

Key words

rock tunnel / P wave / SV wave / transformation of artificial boundaries / incident angle

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ZHANG Dongdong1, LIU Yang2, XIONG Feng1, MEI Zhu2, LI Shuang3. Seismic response analysis of rock tunnel near-portal under oblique incidence of P wave and SV wave[J]. Journal of Vibration and Shock, 2022, 41(24): 278-286

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