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海岸構造物基礎周辺の流体と地盤変動の高精度連成解析モデルの開発

沿海结构物基础周围流体与地面变形高精度耦合分析模型的开发

基本信息

批准号：
17760401
负责人：
楳田真也
金额：
$ 2.11万
依托单位：
Kanazawa University
依托单位国家：
日本
项目类别：
Grant-in-Aid for Young Scientists (B)
财政年份：
2005
资助国家：
日本
起止时间：
2005 至 2006
项目状态：
已结题

项目摘要

海岸構造物周辺の流況・流体力の基本特性を把握し,基礎部周辺の流体・底質輸送・地盤変動の連成解析モデルを構築するために,以下の3つの解析を実施した.(1)非対称振動流中の柱状構造物周辺の流況と流体力の解析高波浪条件下の海岸構造物周辺の流動特性に関する知見を得るために,非線形クノイド波を模擬した流速変動波形を有する非対称振動流場に設置した円柱周辺の流体場を対象として詳細な数値解析を行った.KC数と非対称パラメータを用いた渦放出数の予測式を提案するとともに,渦流れパターンと流体力変動の関連,流れ方向流体力と直行方向流体力の相関,流体力係数とKC数および非対称パラメータとの関係を明らかにした.(2)一様流場における柱状構造物周辺の洗掘過程の解析前年度および(1)で開発・検証した一般曲線座標系表示のNavier-Stokes方程式を用いた非定常3次元流体解析モデルに,掃流砂輸送量式と底質の体積保存式からなる底面地形解析モデルおよび底質粒子の安定条件を考慮した斜面滑動モデルを組み込んで,流体運動と地形変動の連成解析モデルを構築した.本解析モデルを一様な砂質地盤上に設置された直立円柱周辺の一様流場に適用し,周辺流況と局所洗掘の発達過程を解析した.洗掘開始から平衡状態に至るまでの洗掘孔およびマウンドの発達過程や洗掘孔内の流速分布の変化特性を良好に捉えた.(3)振動流場における円柱構造物周辺の洗掘過程の解析さらに,(2)で構築した連成解析モデルを振動流場における小口径円柱周辺の局所洗掘の問題に適用し,KC数による洗掘地形と渦流れパターンの変化を考察した.最大洗掘深とKC数との関係を良好に再現できるが,洗掘形状の再現性には問題が残るため,加速度のある流体場へ適用するには底質輸送モデルの高度化が重要であることが分かった.

To grasp the basic characteristics of flow condition and fluid force around the coastal structure, analyze the connection of fluid, sediment transport and site movement around the foundation, and carry out the analysis of the following three points. (1)Analysis of flow conditions and hydrodynamic forces around columnar structures in asymmetric vibration flow. Prediction of flow characteristics around columnar structures under high wave conditions. The relationship between the vortex and the fluid force is clear. The relationship between the fluid force and the fluid force in the straight direction is clear (2)The analytical pre-analytical period of the washing process of the periphery of a columnar structure in the case of potential flow is (1). The Navier-Stokes equations expressed in a general curvilinear coordinate system are used in the analysis of unsteady three-dimensional fluids. The equation for the volume preservation of the substrate is used in the analysis of the topography of the bottom surface. The stability conditions of the substrate particles are considered. Fluid motion and topography are analyzed. This paper analyzes the potential flow around the vertical cylinder set on the sandy soil, and analyzes the development process of the circumferential flow and the local washing. From the beginning of washing to the equilibrium state, the development process of the washing hole and the variation characteristics of the flow velocity distribution in the washing hole are well understood. (3)The analysis of the process of cleaning the periphery of a circular pillar structure due to vibration potential flow (2) The construction of a circular pillar structure due to vibration potential flow (3) The analysis of the process of cleaning the periphery of a circular pillar structure due to vibration potential flow (4) The application of the KC number to the problem of cleaning the periphery of a circular pillar structure due to vibration potential flow (5) The investigation of the process of cleaning the periphery of a circular pillar structure due to vibration potential flow (6) The analysis of the structure of a circular pillar structure due to vibration potential flow (7) The relationship between maximum depth of excavation and KC number is well reproduced. The reproducibility of excavation shape is problematic. The application of acceleration to fluid field is important for the enhancement of substrate transport.