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    Please use this identifier to cite or link to this item: http://ir.lib.ncu.edu.tw/handle/987654321/68014

    Title: 砂質水泥改良土剪脹之依時性;Time dependency of dilatancy for cement treated sandy soil
    Authors: 蔡秉諺;Tsai,Bing-yan
    Contributors: 土木工程學系
    Keywords: 三軸壓密不排水試驗;潛變試驗;剪脹係數;時間依存性;CU test;creep test;coefficient of dilatancy;time dependency
    Date: 2015-07-28
    Issue Date: 2015-09-23 10:12:22 (UTC+8)
    Publisher: 國立中央大學
    Abstract: 利用水泥來進行土壤改良,透過少量的水泥添加,可提升回填土壤之工作性及適用性。在過去已有相關之動力三軸、靜力三軸及抗分散劑之添加等的研究與成果。然而,在受剪時間效應部分之探討卻仍顯得不足。本研究針對此一部分,進行相關之試驗分析與探討。
    ;To improve soil properties with cement, we may add a small amount of cement to enhance the workability and suitability of soil. A lot of researches had been conducted with cyclic triaxial tests, CU tests, and adding different types of coagulant in the past. However, research about time dependency of dilatancy is rare. In this study, the relative experiments were performed for analysis and discussion.
    In the static triaxial tests (CU test) of cement treated sand, the shear strength was improved. Then, to understand the development of excess pore water pressure with time, we performed a series of static triaxial creep tests. The test results showed that adding cement can decrease the development of excess pore water pressure. Use these experimental data to draw graphics, then a set of equations of dilatancy coefficient with time for different cement contents were obtained. Through these equations, the excess pore water pressure of cement treated sand applying a constant axial load for a long period can be obtained. Then, performed a series of step loading static triaxial tests, and compared the test results with the calculated values, and good consistency was obtained. The equations can be used as a practical estimation of excess pore water pressure with time. Finally, a cyclic triaxial test was performed to compare with the development of excess pore water pressure of static triaxial test (CU test). Negative values of excess pore water pressure were found in a rapid loading.
    Appears in Collections:[土木工程研究所] 博碩士論文

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