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題 名 | 預剪應力對飽和砂土動態參數之影響=The Effect of Pre-Shear Stress on the Dynamic Behavior of Saturated Sand |
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作 者 | 金永斌; 王建元; | 書刊名 | 成功大學學報 |
卷 期 | 35(科技.醫學篇) 民89.11 |
頁 次 | 頁27-51 |
分類號 | 441.12 |
關鍵詞 | 動態預剪應力; 剪力模數; 阻尼比; Dynamic pre-shear stress; Shear modulus; Damping ratio; |
語 文 | 中文(Chinese) |
中文摘要 | 本文對非均向壓密飽和砂土施加反覆荷重作用為動態預剪應力的作用,以瞭解初始剪應力及動態預剪應力,對其剪力模數及阻尼比的影響,並嘗試利用試驗結果建立經驗公式,對砂土的剪力模數及阻尼比進行定量化分析,提供現場實際應用之參考。試驗結果顯示,就剪力模數而言,初始剪應力具有降低的效應,且在低剪應變振幅下較為明顯,而動態預剪應力的效應,則隨著先前超額孔隙水壓比的增加而增加至一最高值,然後逐漸降低;若就阻尼比而言,初始剪應力的施加則幾乎沒有影響,而動態預剪應力則有降低的趨勢。 |
英文摘要 | The purpose of this study is to understand the effect of initial shearstress and dynamic pre-shear stress on shear modulus and damping ratioof saturated sand, the mathematical relationship between them were also developed in this paper . A series of static drained triaxial tests and cyclic undrained triaxial tests were performed on local Li-Kong sand. The testresults show that the previous initial shear stress significantly decreasesthe shear modulus due to the lower initial strain, and increases it for the average effective normal stress. As for the effect of dynamic pre-shearing,the shear modulus reaches a maximum value and then drops accompanied with the previous excess pore water ratio. However the damping ratio is not affected by the initial shear stress, but the dynamic pre-shear stress tend to drop it. |
本系統中英文摘要資訊取自各篇刊載內容。