海上风电单桩基础周围土体地震液化分析

发布时间：2019-06-29 13:05

【摘要】：基于室内土工动三轴土体液化试验,采用有限元分析计算与剪应力比较法相结合的综合判别方法,对于黄河三角洲地区海上风电单桩基础周围土体是否会液化进行了判断,并且通过对比不同位置处土体单元受力情况,总结出单桩基础的存在对于其周围土体地震荷载作用下动力响应的影响。研究发现,土体液化只会在一定深度内发生,12m以下土体由于上覆有效应力较大基本不会发生液化。单桩基础对于桩内土体约束作用十分明显,同时会剧烈加大桩侧土体的受力。本文通过对土体施加X轴方向上的加速度的方式模拟地震作用,结果显示,位于单桩基础X轴方向上的土体单元相较于Y轴方向上等距离的土体单元,受到的剪应力振荡幅度要大的多。
[Abstract]:Based on the triaxial soil liquefaction test of indoor geotechnical engineering, the liquefaction of the soil around the offshore wind power single pile foundation in the Yellow River Delta is judged by using the comprehensive discriminant method of finite element analysis and shear stress comparison method, and the influence of the existence of the single pile foundation on the dynamic response of the surrounding soil under seismic load is summarized by comparing the stress of the soil element at different locations. It is found that the liquefaction of soil will only occur in a certain depth, and the liquefaction of soil below 12m will not occur because of the large effective stress of overlying soil. The restraint effect of single pile foundation on soil in pile is very obvious, and the force on pile side soil will be greatly increased at the same time. In this paper, the seismic action is simulated by applying the X-axis upward acceleration to the soil. The results show that the shear stress vibration amplitude of the soil element located in the X-axis direction of a single pile foundation is much larger than that of the soil element with equal distance in the Y axis direction.
【作者单位】：中国海洋大学海洋环境与生态教育部重点实验室;中国海洋大学环境科学与工程学院;
【基金】：国家自然科学基金项目“波浪作用下海上风电场桩基土体液化响应研究—以黄河三角洲为例”(41572247) 山东省科技攻关资助项目“黄河三角洲海上风电场桩基设计关键技术研究”(2014GGX104007)资助~~
【分类号】：TU435

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