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研究生:黃福盛
研究生(外文):Huang, Fu-Shen
論文名稱:土壤三軸試體之壓力波速量測與理論模式初探
論文名稱(外文):Preliminary Investigation on Measurement and Modeling of Compressive Wave Velocity of a Triaxial soil Specimen
指導教授:張德文張德文引用關係
指導教授(外文):Chang, Der-Wen
學位類別:碩士
校院名稱:淡江大學
系所名稱:土木工程學系
學門:工程學門
學類:土木工程學類
論文種類:學術論文
論文出版年:1996
畢業學年度:84
語文別:中文
論文頁數:185
中文關鍵詞:壓力波速容積模數孔隙壓力參數飽和度
外文關鍵詞:Compressive Wave VelocityBulk ModulusPore-Pressure ParametersDegree of Saturation
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本研究擬發展土壤壓力波速之量測實驗, 並由容積模數之基本定義, 以
不同的應力應變假設推導出相異之容積模數公式, 再藉實驗的量測印證該
容積模數之可行性. 各模式除考慮孔隙比, 飽和度對其所造成之影響外,
更將孔隙壓力參數與應力狀態納入相關公式中. 實驗方式以壓電晶片量測
經由土壤試體傳送所產生的震波波訊時間差為主, 並計算其傳遞波速; 同
時針對不同飽和度之土壤, 以無圍束, 等向壓縮及三軸不排水等應力狀態
施測之, 比較實驗觀測值與各模式模擬值以充份了解各模式之行為. 由
實驗結果顯示, 土壤壓力波速受孔隙比, 飽和度以及應力狀態的影響很
大, 而波速則大致上隨孔隙比之減小, 飽和度之增加以及圍壓或軸差應力
之增加而增加. 在無圍束及等向壓縮不排水應力狀態之模式印證中發現,
應變均質模式較適合於低飽和度之模擬, 而接近完全飽和狀態下則以應力
均質模式的模擬較適合; 考慮應力參數影響之三軸應力狀態則因飽和度,
孔隙比值之量測限制而產生明顯的預測誤差, 而三軸應力狀態下土壤過量
之應變行為與彈性容積模數的基本假設亦不盡相同, 其皆為造成模數模擬
值與實驗觀測值不盡相符的原因. 為求模式印證的完整, 各相態的獨立容
積模數值校估異常重要; 而孔隙壓力參數值則可表為飽和度 (或應力狀
態) 相關的函數, 以模擬其影響.

In this study, laboratory testing of dynamic compressive wave
measurements are conducted in order to clarify the equations for
bulk modulus of soils. Modeling with these equations takes
account of the void ratio, moisture and state of stress as well
as the pore pressure parameters. Experimental work are conducted
by measuring the travel time of compressive wave propagating
through a triaxial specimen under unconfined, isotropic
compressions and triaxial with undrained conditions.
Correspondent wave velocity and material modulus are thereafter
computed. Results of this study shows that the compressive wave
velocity of soils are highly affected by void ratio, degree of
saturation and the stress conditions. As being subjected to the
unconfined and isotropic compression, the compressive
characteristics of soils are found to be successfully modeled by
the strain compatibility equation at most wet conditions;
however, when the soil becomes nearly saturated (Sr>99%),
character of the soil mixture seems to be wellreproduced by
assumming an uniform internal stress distribution along its
body. The triaxial modeling which consists of the pore pressure
parameters and a stress ratio constant are found disagreeable
with the experimental work due to the limits of current
measurements and data interpretation. To verify these results,
bulk modulus of the individual phase material ought to be
determined with precaution. The pore pressure parameters in this
study can be written as function of degree of saturation (or
state of the stress) for simplicity.

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