穿黄隧洞地基地震反应分析与液化可能性评价
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摘要
南水北调中线穿黄隧洞所在土层的空间及土性变化大,在地震时易产生不均匀变形,从而导致结构破坏。针对穿黄隧洞段地基,基于土体三维弹塑性动力本构模型,考虑孔隙水压力消散和扩散,建立了土工地震反应分析的三维真非线性有效应力动力分析方法及抗震安全评价方法。利用土料动力特性的三轴试验成果,对穿黄隧洞段地基进行了地震反应分析,给出了地基的加速度反应、应力反应,并进行了地基的液化可能性评价,为隧洞结构的抗震设计提供了有力的理论指导。
We reveal the large variation of spatial distribution of soil layers and soil parameters of the tunnel crossing Yellow River of South-to-North Water Diversion Project,which are likely to result in uneven displacement when an earthquake happens,and therefore induce destruction of the tunnel.In view of the tunnel foundation and based on viscoelastic plasticity dynamic constitutive model of soil,we propose a 3-D effective stress dynamic analysis method for geotechnical seismic analysis and an anti-seismic safety evaluation method with consideration of the dissipation and diffusion process of pore water pressure.Using the soil dynamic parameters,we conduct a seismic analysis of the tunnel foundation to obtain its acceleration response and stress response,and conduct an evaluation on liquefaction possibility of the foundation.The research results can provide a theoretic support for seismic design of the tunnel crossing Yellow River.
We reveal the large variation of spatial distribution of soil layers and soil parameters of the tunnel crossing Yellow River of South-to-North Water Diversion Project,which are likely to result in uneven displacement when an earthquake happens,and therefore induce destruction of the tunnel.In view of the tunnel foundation and based on viscoelastic plasticity dynamic constitutive model of soil,we propose a 3-D effective stress dynamic analysis method for geotechnical seismic analysis and an anti-seismic safety evaluation method with consideration of the dissipation and diffusion process of pore water pressure.Using the soil dynamic parameters,we conduct a seismic analysis of the tunnel foundation to obtain its acceleration response and stress response,and conduct an evaluation on liquefaction possibility of the foundation.The research results can provide a theoretic support for seismic design of the tunnel crossing Yellow River.
引文
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[3]赵剑明,汪闻韶.混凝土面板堆石坝面板地震反应分析[J].岩石力学与工程学报,2001,20(s2):1573-1577.
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[5]中国水利水电科学研究院.穿黄隧洞工程抗震安全性研究———穿黄隧洞工程地基土动力特性试验研究报告[R].北京:中国水利水电科学研究院,2007.
[2]赵剑明,汪闻韶,常亚屏,等.高面板坝三维真非线性地震反应分析方法及模型试验验证[J].水利学报,2003,(9):12-18.
[3]赵剑明,汪闻韶.混凝土面板堆石坝面板地震反应分析[J].岩石力学与工程学报,2001,20(s2):1573-1577.
[4]赵剑明,汪闻韶,张崇文.土石坝振动孔压影响因素的研究[J].水利学报,2000,(5):54-59.
[5]中国水利水电科学研究院.穿黄隧洞工程抗震安全性研究———穿黄隧洞工程地基土动力特性试验研究报告[R].北京:中国水利水电科学研究院,2007.
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