穿越液化流滑区盾构隧道纵向非线性地震响应研究

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摘要明确场地液化流滑区越江跨海盾构隧道结构的抗震性能，本文以宽河谷微倾斜可液化场地在不同地震动强度下土层的位移时程作为输入地层震动状态，并基于广义反应位移法建立了4.8km精细化梁-弹簧盾构隧道模型，研究了场地液化流滑对盾构隧道纵向地震响应和相邻管环纵向张开量的影响。研究结果表明：场地的液化流滑将导致盾构隧道产生极大的环间纵向张开量、截面拉力和压力突变，充分说明了场地流滑对隧道结构地震安全的危害性；盾构隧道损害严重位置处均位于液化土层的滑动面；沿轴线的弯矩变化曲线与加速度放大系数曲线和河谷地形具有一致性，且曲线在液化区呈现出明显的突变现象。

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	李孝雄 1
	庄海洋 1
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	王伟 1
	赵凯 1
	陈国兴 1

关键词 ：盾构隧道, 广义反应位移法, 液化流滑, 环间张开量, 地震响应

Abstract：To clarify the seismic performance of the cross-river and cross-sea shield tunnel structure in the liquefied flow slippage area of the site, a 4.8km refined beam-spring shield tunnel model is established based on the generalized response displacement method. The displacement time histories of soil layers under different ground motion intensities in a slightly inclined liquefiable wide river valley site are used as input ground motion states. This paper investigates the effects of site liquefaction flow slippage on the longitudinal seismic response of shield tunnels and the longitudinal opening of adjacent pipe rings. According to the results, the liquefied flow slippage of the site will cause the shield tunnels to produce extremely large longitudinal openings, abrupt changes in section tension and compressive. It fully illustrates the hazard of site flow slippage on the seismic safety of tunnel structures. The severe damage locations of the shield tunnel are located on the sliding surface of the liquefied soil layer. The bending moment variation curves and the acceleration amplification coefficient curves along the axis are consistent with the river valley topography, and the curves show obvious abrupt changes in the liquefaction zone.

Key words： shield tunnel generalized response displacement method liquefied flow slippage opening value between ring intersegment seismic response

收稿日期: 2022-12-19 出版日期: 2024-01-15

引用本文:

李孝雄 1，庄海洋 1,2，王伟 1，赵凯 1，陈国兴 1. 穿越液化流滑区盾构隧道纵向非线性地震响应研究[J]. 振动与冲击, 2024, 43(1): 131-137.
LI Xiaoxiong1, ZHUANG Haiyang1,2, WANG Wei1, ZHAO Kai1, CHEN Guoxing1. Longitudinal nonlinear seismic response of shield tunnel passing through liquefied flow slip zone. JOURNAL OF VIBRATION AND SHOCK, 2024, 43(1): 131-137.

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http://jvs.sjtu.edu.cn/CN/ 或 http://jvs.sjtu.edu.cn/CN/Y2024/V43/I1/131

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