頁籤選單縮合
題名 | 標準砂受剪前後組構之演化與統計模式=Evolution and Statistical Model of the Fabric of Standard Sand Under Direct Shearing |
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作者 | 黃偉慶; 郭來松; | 書刊名 | 中國土木水利工程學刊 |
卷期 | 10:2 1998.06[民87.06] |
頁次 | 頁243-250 |
分類號 | 441.12 |
關鍵詞 | 土壤組構; 孔隙比; 土壤薄切片; Soil fabric; Void ratio; Soil thin-section; |
語文 | 中文(Chinese) |
中文摘要 | 本文應用薄切片技術配合影像分析方法,直接量測標準砂受剪前後組構的演化並 推導統計組構模式。研究結果顯示,無論初始狀態為鬆或緊密,標準砂區域孔隙比皆趨向較 小孔隙比之分佈,且緊密試樣之區域孔隙比頻率分佈較鬆試樣者有更明顯集中的趨勢;同時, 標準砂受剪前後之區域孔隙比分佈可以貝他分佈充分模擬。影響貝他分佈之因素包括最小區 域孔隙比e□、α、β三個參數,e□屬材料性質僅與顆粒大小有關,α及β則隨砂樣緊密 程度和剪動而增加,其中α之增加量與正向應力大小無關,而β則隨正向應力愈大其值的增 加量略為減緩。 |
英文摘要 | This study investigates the fabric of the standard sand. Direct shear tests were conducted on specimens prepared at different relative densities. During the test, specimens were impregnated with resin at different stress states to freeze the fabric of specimens. Measurements on the local void ratio of specimen thin-sections provide insight to fabric evolution upon shearing. It is found that the frequency distribution of the void ratio of the standard sand, at both initial and peak shearing stress states, can be statistically described by the beta distribution characterized by the three parameters e□, α, β. The e□ is a material property governed by the gram size. As the specimens are sheared, the frequency of occurrence of small void ratios tends to increase and that of large void ratios decreases, resulting in the increase of α and β. |
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