Design and development of a riprap work having resistivity against overtopping flow on soil embankment.

土堤抗漫溢流抛石工程的设计与开发。

• 批准号: 14560196
• 负责人: MORII Toshihiro
• 金额: $ 2.05万
• 依托单位: Niigata University
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (C)
• 财政年份: 2002
• 资助国家: 日本
• 起止时间: 2002 至 2003
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-14560196/
• 关键词: Riprap work; Overtopping flow; Rockfill; Head loss equation of flow; Hydraulic mean radius of voids; Laboratory water flume tests; オーバートッピング(越流); 流れの非線形水頭損失特性; 土砂の透水性; 捨石工(リップラップ工); 水理学的安定性; 浸食メカニズム; 流れの水頭損失

The purpose of the Research Project Is to investigate hydraulic and mechanical properties of rockfill and to propose a design procedure of riprap work that effectively resist against overtopping flow on soil embankment. Rock has been advantageously employed in hydraulic structures such as rockfill dams, flow-through embankments, rubble weirs and riprap works. To predict a flow transmissibility of the rockfill structure, an accurate evaluation of head loss property of flow through rockfill is required. In the Research Project, a head loss equation of flow through rockfill that is applicable to a wide range of rock particle size is proposed. A quadratic equation is selected to describe the head loss property of flow through rock fill. Two nonlinear coefficients included in the equation are effectively determined as a function of a hydraulic mean radius of rockfill voids based on laboratory tests using river gravel 5 to 75 mm in diameter. It is shown that the head loss equation of flow determined can be well applied to predict the flow transmissibility of rockfill structures without any consideration of scale effect of flow. A numerical experiment is conducted to estimate an amount of laminar flow composing the flow through rockfill. The laminar flow is found to be negligible even in the flow through a small size structure constructed using small rock particles. A parameter estimation procedure that employs a simple genetic algorithm combined with FEM calculation is also developed to determine the nonlinear coefficients in the head loss equation from a stage-discharge rate data observed in the laboratory or in the field/ Investigations of the mechanical property of rockfill as well as of soil erosion in an underlying foundation that have been left behind this two-year project will be tackled successively by the Head Investigator.

本研究目的在于探讨堆石体之水力及力学特性，并提出一套能有效抵抗土堤漫顶水流之抛石工程设计程序。岩石已被有利地用于水利结构，如堆石坝、过流围堰、碎石堰和抛石工程。为了预测堆石结构的过流能力，需要准确评价过堆石体的水头损失特性。在本研究计画中，提出一适用于较宽粒径范围之堆石体水流水头损失方程式。采用二次方程描述堆石体中水流的水头损失特性。基于使用直径5至75 mm的河砾石进行的实验室测试，方程中包含的两个非线性系数有效地确定为堆石空隙水力平均半径的函数。结果表明，所确定的水流水头损失方程可以很好地用于预测堆石结构的过流系数，而无需考虑水流的尺度效应。通过数值实验估算了堆石体中层流的数量。层流被发现是可以忽略不计的，即使在通过一个小尺寸的结构使用小岩石颗粒构造的流动。本文还提出了一种基于遗传算法和有限元计算相结合的参数估计方法，用于根据实验室或现场实测的水位流量资料确定水头损失方程中的非线性系数。一年的项目将由首席研究员连续处理。

项目成果

Morii, T.: "Head joss equation to predict flow transmissibility of rockfill structures."Proceedings of the fifth International Conference on Hydro-science and Enaineerina. file 218(CD). (2002)

Morii, T.：“预测堆石结构渗流能力的头荷方程”。第五届国际水文科学和 Enaineerina 会议论文集。

森井俊広: "ロックフィルを通る非線形流れのパラメータ推定"農業土木学会論文集. 218. 89-95 (2002)

Toshihiro Morii：“通过堆石的非线性流动的参数估计”日本农业和土木工程师学会会刊 218. 89-95 (2002)。

森井俊広: "礫構造物を通る流れの水理特性"第30回土木学会関東支部技術研究発表会. (CD). 2-70 (2003)

Toshihiro Morii：“流过砾石结构的水力特性”第30届日本土木工程师学会关东分会技术研究报告2-70（CD）。

Morii, T., Takeshita, Y., Inoue, M.: "Practical determination of soil permeability of sand sediment that includes gravel and cobbles."Proceedings of the International Conference on Problematic Soils. 2. 393-400 (2003)

Morii, T.、Takeshita, Y.、Inoue, M.：“包括砾石和鹅卵石的沙沉积物的土壤渗透性的实际测定。”问题土壤国际会议记录。

森井俊広: "遺伝的アルゴリズムを用いた非ダルシー流れのパラメータ推定"新潟大学農学部研究報告. 54(2). 159-167 (2002)

Toshihiro Morii：“使用遗传算法的非达西流参数估计”新泻大学农学院研究报告 54(2) (2002)。