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題名 | Shear and Compressive Wave Velocities on Sands in Various Stress States=不同應力條件下砂土的的剪力波速及壓力波速 |
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作者姓名(中文) | 李崇正; 黃香燕; | 書刊名 | 臺灣公共工程學刊 |
卷期 | 1:1 民94.04 |
頁次 | 頁61-70 |
分類號 | 441.12 |
關鍵詞 | 剪力波速及壓縮波速; 應力路徑; 應力比; 彎曲元件; 砂土; Shear wave and compressive wave velocities; Stress path; Bender elements; Sand; |
語文 | 英文(English) |
中文摘要 | 土壤的剪力波速及壓力波速能提供分析基礎震動及土壤結構互制問題重要的系統參數。本研究利用壓電陶瓷晶片製作兩組震動感應器裝置於三軸室的底座及頂蓋,可以在進行三軸剪力試驗時,量測在軸向傳播的壓力波速及剪力波速。進行一系列不同應力路徑的三軸剪力試驗,並且量測剪力波速及壓力波速,探討三種不同砂土的動態特性及在不同應力條件下的剪力波速及壓力波速的變化關係。試驗結果顯示剪力波速及壓力波速隨著應力路徑及應力狀態的不同,而有顯著不同。本文利用波速比來探討圍壓、應力比、應力路徑及應力歷史對波速的影響程度。 |
英文摘要 | The compressive wave velocity and shear wave velocity in soils can provide significant system parameters for analyzing foundation vibration problems. In this study, two pairs of piezoelectric ceramic transducers built into a triaxial cell were developed that are capable of measuring the compressive and shear wave velocities propagating in the axial direction. A series of triaxial tests using different stress paths were conducted on sands to investigate their mechanical properties and to simultaneously measure the compressive and shear wave velocities. The measured wave velocities varied depending on the stress path and stress state. A new measure, referred to as the wave velocity ratio, was proposed to evaluate the variations of velocity along various stress paths in three types of sand. The effects of confining pressure, current stress ratio, stress path, and stress history on the variations of wave velocities are discussed in detail. |
本系統之摘要資訊系依該期刊論文摘要之資訊為主。