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研究生:呂玉鉛
研究生(外文):Lu, Yeh-Chian
論文名稱:細顆粒對砂土性質之影響:試驗與結果之分析
論文名稱(外文):Effects of Finer Material on the Behavior of Sands: Experiments and Analyses of Results
指導教授:黃安斌黃安斌引用關係
指導教授(外文):An-Bin Huang
學位類別:碩士
校院名稱:國立交通大學
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:77
中文關鍵詞:細顆粒粉土三軸試驗中空扭剪試驗
外文關鍵詞:FinessiltTriaxial testTorsional Simple Shear Test
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由經驗得知當砂土中含有細顆粒時,其工程性質與均勻級配之砂土有很大
不同。在相同的相對密度下,均勻級配的砂土可能是膨脹性(dilatant),
如有細顆粒則可變成收縮性(contractive)。細顆粒對現場土壤試驗,比
如圓錐貫入試驗也可能有很大的影響。我們對於細顆粒如何影響砂土之工
程性質所知有限。本研究進行了一系列試驗以進一步了解細小顆粒對砂土
性質之影響。本文有兩個主要項目:第一、進行不排水之中空扭剪試驗來
瞭解細顆粒含量對砂土剪應力與超額孔隙水壓對剪應變之關係;第二、使
用粉土細料含量從 0 % ~50 %,起始相對密度 30 % 之排水三軸試驗及中
空扭剪試驗來決定細料含量對砂土膨脹性之影響。結果發現細料含量能夠
影響砂土之剪力強度和膨脹性。其影響程度受粒徑比例,圍壓和剪力模式
之控制。
Experience indicates that there are significant differences
between uniformly graded clean sand and graded sand with fines.
Under the same relative density, a uniformly graded sand could
be dilatant and a sand with fines could be contractive. The
fines contents can affect results of in situ tests such as cone
penetration tests. We have limited knowledge as to the how fines
contents affect the behavior of sands. In an effort of enhance
our laboratory experiments have been carried out in this
research project. There are two parts of the research : the
first part includes a series of undrained torsional simple shear
tests to evaluate the shear stress and pore pressure response
during shearing, and their relationship with contents of finer
material. Strain rate controlled drained triaxial and torsional
simple shear tests were performed on sand specimens with 30%
relative density in the second part of the experiments. The
purpose of these tests is to study the effects of fines on
dilatancy of sands and its relationship with shearing mode. Silt
was used as fines and the contents varied from 0 to 50% in the
triaxial specimen. Results indicate that contents of finer
material can affect the dilatancy of sands. These effects are
closely related to diameter ratio between coarse and fine
materials, confining pressure and shearing mode.
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