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題名 | 波浪與有限厚度庫侖阻尼海床之交互作用=Water Waves Interaction with a Coulomb-Damped Poroelastic Seabed of Finite Thickness |
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作者姓名(中文) | 李宗霖; 蔡清標; | 書刊名 | 興大工程學刊 |
卷期 | 12:2 2001.07[民90.07] |
頁次 | 頁71-84 |
分類號 | 441.12 |
關鍵詞 | 波浪; 庫侖阻尼; 壓力波; 剪力波; 土壤動力反應; Waves; Coulomb-damped; Compressional wave; Shear wave; Seabed dynamic response; |
語文 | 中文(Chinese) |
中文摘要 | 本文旨在解析並探討波浪通過於一平坦、有限厚度且具有庫侖阻尼摩擦效應的海床時,波浪與海底床之交互作用問題。往昔學者為得到一較簡單的數學式來描述多孔隙介質的運動行為,大多忽略孔隙介質中流體與固體結構的互制運動行為及土壤內部摩擦效應的影響。基此,本文除將透水彈性體中固體結構與孔隙流體分開推導其個別運動方程式外,並考慮波浪作用於土壤內部時,產生了兩種壓力波及一種剪力波。由於剪力波對低滲透率的土壤有重要的影響,因此在波浪與海床交互作用的問題時,庫侖阻尼摩擦效應的作用顯得重要。由解析之結果發現,具有庫侖阻尼摩擦效應的細砂或黏土海床對波浪流場的變化有明顯的影響,且在土壤動力反應,也以細砂或黏土海床之影響最為顯著。 |
英文摘要 | In this paper, the Coulomb-damping friction is considered in the problem of the wave-seabed interaction in a porous seabed of finite thickness. A closed-form analytical solution is presented here. In the model, the water waves and porous seabed are coupled in a complex wave number. Thus, the effects of soil properties on the wave characteristics can be examined. In addition, three types of elastic waves are considered in the seabed induced by the water wave: compressional wave in the soil skeleton and in the pore fluid, respectively, and the third is a shear waves in the soil skeleton, due to the low rigidity and permeability of the fine sand and clay. The results indicate that the coulomb-damping friction is significantly affects the wave-induced pore pressure in a seabed of fine sand and clay. Also, the wave characteristics have been significantly affected by the seabed response. |
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