土体率效应对动力锚沉贯深度影响

发布时间：2018-03-18 05:15

本文选题：海洋基础　切入点：动力锚　出处：《大连理工大学学报》2017年01期 　论文类型：期刊论文

【摘要】：动力安装锚(简称动力锚)是一种依靠自重进行安装、适用于深海锚泊系统的新型锚固基础.在动力沉贯过程中,土体经受很高的剪应变率(约25s-1),因此必须考虑土体率效应影响.总结了以往关于土体率效应的研究成果,整理了常用3种率效应模型中参数的取值范围,采用运动微分方程研究了不同率效应模型参数对动力锚沉贯深度的影响.结果表明:土体率效应会造成动力锚的沉贯深度显著减小,可偏小30%~40%;当率效应参数较大时,锚的沉贯深度对参考应变率的变化比较敏感;摩擦项与端承项的率效应比值对动力锚的沉贯深度影响较大,需要进一步研究该比值的确切取值方法;给出了可以满足任意形状和深度的矩形基础承载力计算公式.
[Abstract]:Dynamic installation anchor (abbreviated as dynamic anchor) is a new type of anchor foundation for deep-sea mooring system, which is installed by self-weight. Soil is subjected to very high shear strain rate (about 25s-1g), so the influence of soil rate effect must be taken into account. The results of previous researches on soil mass rate effect are summarized, and the range of parameters in the three commonly used rate effect models is sorted out. The effects of the parameters of different rate effect models on the penetration depth of dynamic anchors are studied by using the motion differential equation. The results show that the soil mass ratio effect can significantly reduce the penetration depth of the dynamic anchors, which can be slightly reduced by 30% and 40%, and when the parameters of the rate effect are larger, The penetration depth of the anchor is sensitive to the change of the reference strain rate, the ratio of the friction term to the end bearing item has a great influence on the penetration depth of the dynamic anchor, so it is necessary to further study the exact value of the ratio. A formula for calculating the bearing capacity of rectangular foundation with arbitrary shape and depth is given.
【作者单位】：大连理工大学海岸和近海工程国家重点实验室;上海勘测设计研究院有限公司;
【基金】：国家自然科学基金资助项目(51479027;51539008)
【分类号】：U653.2

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