剪切波传播时松散水饱和砂质海洋沉积物中固相和液相强度相互作用的功率评估

IF 0.7 Q4 OCEANOGRAPHY
V. Lisyutin, O. Lastovenko
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引用次数: 0

摘要

目的。考虑了海相砂质沉积物中剪切波的传播。横波的声学特性是相速度和衰减系数。已知在干砂质沉积物中,衰减系数与频率成正比。在饱和介质中,存在与此定律的偏差,这意味着存在两种物理损失机制-粒间摩擦和粘性损失。本研究旨在建立非固结海相沉积物中剪切波传播的两相理论模型,并识别孔隙空间中流体相对运动引起的耗散效应。方法与结果。用一个弹簧来模拟晶间摩擦,它是一个结合了弹簧的保守性和阻尼的耗散性的元素。应用运动方程,其中假定流体的一部分与介质固相相关联,另一部分被认为是流动的。对于谐波位移,状态方程和运动方程给出了一种新的两相色散关系(即GS + EDs理论)。将GS + EDs理论的结果与公开资料中的速度和衰减测量数据进行了比较。结果表明,在纵波和横波传播过程中,颗粒之间以及颗粒与流体之间的相互作用机制并不相似。分析了流体饱和时颗粒间摩擦参数的变化特征。结论。孔隙流体饱和引起的耗散效应的表现取决于颗粒堆积的密度。在充填较密的情况下,不存在流体相对运动的条件,砂质沉积物表现出q因子恒定的特性。当填料松散时,粘性损失的贡献很大,衰减的频率关系是非线性的。压缩波和剪切波的有效孔径并不一致。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Assessing the Power of Intensity Interaction between the Solid and Fluid Phases in the Unconsolidated Water-Saturated Sandy Marine Sediments at Shear Wave Propagation
Purpose. Propagation of a shear wave in sandy marine sediments is considered. The acoustic properties of a shear wave are the phase velocity and the attenuation coefficient. It is known that in dry sandy sediments, the attenuation coefficient is directly proportional to frequency. In the saturated mediums, there are the deviations from this law that implies existence of two physical mechanisms of losses – the intergranular friction and viscous loss. The study is aimed at developing a two-phase theoretical model of the shear wave propagation in the unconsolidated marine sediments, and at identifying the dissipative effects caused by the fluid relative movement in the pore space. Methods and Results. The intergranular friction is modeled using a springpot, which represents an element combing conservative properties of a spring and dissipative ones of a dashpot. The equation of motion is applied, where a part of fluid is assumed to be associated with the media solid phase and another part is considered to be mobile. For a harmonic displacement, the equations of state and the equation of motion yield a new two-phase dispersion relation (the theory of Grain Shearing + Effective Density, or GS + EDs, for short). The results of the GS + EDs theory are compared with the data of the velocity and attenuation measurements taken from the open sources. It is shown that during propagation of the compressional and shear waves, the mechanisms of interaction between the granules, and between the granules and fluid are not similar. Character of the changes in the grain-to-grain friction parameters when the pore space is saturated with fluid, is analyzed. Conclusions. Manifestation of the dissipative effects resulting from the pore saturation with fluid depends on the density of the granules packing. In case of a dense packing, there are no conditions for the fluid relative movement, and the sandy sediments exhibit the property of constant Q-factor. If the packing is loose, the viscous losses make a significant contribution, and the attenuation frequency dependence is nonlinear. The effective pore sizes for the compression and shear waves do not coincide.
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来源期刊
Physical Oceanography
Physical Oceanography OCEANOGRAPHY-
CiteScore
1.80
自引率
25.00%
发文量
8
审稿时长
24 weeks
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