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Study of Oceanic Wave and Submarine Mass Movement

海浪与海底物质运动研究

基本信息

批准号：
63490019
负责人：
TATEISHI Masaaki
金额：
$ 5.06万
依托单位：
Niigata University
依托单位国家：
日本
项目类别：
Grant-in-Aid for General Scientific Research (B)
财政年份：
1988
资助国家：
日本
起止时间：
1988 至 1990
项目状态：
已结题

项目摘要

The purpose of this project is to make clear the phenomena and the process of liquefaction and mass-movement of submarine soil layers, and of the transportation of sand body, which are caused by the interaction between submarine soil layer and wave, especially storm wave. The results are summarized as follows :1) The investigation of characteristics of the submarine soil profile in Sagami Bay, Suruga Bay and Seto Inner Sea reveals that sediment profiles can be well expressed by the simplified equations deduced assuming grains. Using the equations, sediment profiles can be predicted in terms of water content, void ration, undrained shear strength, unconfined compressive strength and effective overburdened pressure.2) The mass-movement sediments caused by storm waves in the geologic and historical ages are fine- to very fine-grained, well sorted sands which don't include the smaller grains more than silt-sized. They show characteristic hummocky stratification. The sheet sands by storm-ge … More nerated turbidity currents are deposited in the deeper environment than storm wave base.3) The general relationship between wave condition and outbreak of liquefaction of soil layer was deduced. The examination of the relationship indicated that the outbreak of liquefaction is affected more by coefficient of pore pressure than by the efficient of compaction.4) To research the liquefaction and effusive sand in the soil layer intercalated with clay layer, the model experiment vibrated forcely was made. The result showed dynamic water pressure with vibration, which indicates the dynamic flow of the soil as liquid, is observed at the liquefied stage, and that the resistance of clay layer accelerates the liquefaction.5) The movement of sands under the condition coexisting wave and turbidity is examined in terms of probability using the Fokker - Planck equation. The result indicated that the distribution of transportation distance is the Gauss distribution in which the distance is increased as time. Less

本项目的目的是明确海底土层与波浪、特别是风暴波相互作用所引起的海底土层液化、质量运动和砂体搬运的现象和过程。主要研究结果如下：1)通过对相模湾、骏河湾和濑户内海海底土壤剖面特征的调查发现，假设颗粒推导的简化方程可以很好地表达沉积物剖面。利用这些方程，可以根据含水量、空隙率、不排水抗剪强度、无侧限抗压强度和有效上覆压力来预测沉积物剖面。2)地质和历史时期由风暴波引起的质量运动沉积物是细粒至极细粒、分选良好的砂粒，不包括比粉砂尺寸更小的颗粒。它们表现出特有的丘状分层。风暴潮产生的片砂沉积在比风暴波基底更深的环境中。3)推导了波浪条件与土层液化爆发之间的一般关系。关系式检验表明,孔隙压力系数对液化爆发的影响大于压实效率的影响。4)为了研究夹粘土层土层的液化和喷砂,进行了力振动模型试验。结果表明，在液化阶段观察到了伴随振动的动水压力，这表明土体作为液体的动态流动，并且粘土层的阻力加速了液化。5)利用Fokker-Planck方程从概率角度检验了波浪和浊度共存条件下砂粒的运动。结果表明，运输距离的分布是距离随时间增加的高斯分布。较少的