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題 名 | 飽和砂土液化強度與電性參數相關性之研究 |
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作 者 | 簡連貴; 李建中; 蕭仲光; | 書刊名 | 力學 |
卷 期 | 9:3 1993.09[民82.09] |
頁 次 | 頁253-262 |
分類號 | 441.12 |
關鍵詞 | 砂土; 液化強度; 電性參數; 飽和; 砂土組構; 異向性; 動力三軸試驗; Sand fabric; Liquefaction; Electrical parameter; Anisotropic index; Cyclic triaxial test; |
語 文 | 中文(Chinese) |
中文摘要 | 砂土組構性質包含兩大特性,即顆粒特性及堆積特性。而砂土組構特性與飽和砂 土之液化潛能息息相關,且電性參數可以充分的反應砂土組構特性。因此,利用電性參數之 量測以評估沖積飽和砂土之液化潛能,為一可行之途徑。 本研究採用 CKC 動力三軸試驗系 統,並配合導電三軸室,利用微電腦自動擷取系統,進行液化試驗各階段及過程中導電度之 量測。由試驗結果顯示,濡濕搗固法試體之液化強度大於多重篩霣降法試體。對同一種砂土 而言,孔隙率愈小(即平均構造因素愈大),其液化強度愈大。砂土之平均形狀因素與孔隙 率及顆粒形狀有密切關係。 F ave、f mean、A等電性參數已可充分反應砂土之基本力學 性質, 以A�纂�(F ave .f mean )之電性參數組合,最能適度地描述液化潛能與電性 參數之關係。 |
英文摘要 | The fabric of sand can be described by "Packing" and "Grain Properties" of the particles and the derived properties of sand are governed by those two characteristics. liquefaction characteristics of saturated sand are influenced by factors such as structural arrangement of particles, porosity, particle shape etc. In this study, the CKC type cyclic triaxial test system and electrical conductivity measurement system were adopted. Personal computer automatic data acquisition system was used to measure the conductivity under liquefaction process. From the results shown that (1) specimen prepared by moist tamping had greater resistance to liquefaction than by multiple sieving pluviation through air, (2) for the same sand, the cyclic stress ratio required to cause initial liquefaction increases with decreasing porosity, (3) average shape factor of sand depends on particle shape and porosity. In general, the cyclic stress ratio required to cause initial liquefaction increases with increasing average shape factor, and (4) in general, it is satisfactory to use the electrical parameter to describe the fundamental properisties of sand such as average formation factor Fave, average shape factor fmean and anisotropic index, A. An index given by A �� /(Fave . fmean ) was found to correlate well with the stress ratio required to cause liquefaction. |
本系統中英文摘要資訊取自各篇刊載內容。