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題名 | Stress-Strain and Yielding Behavior in Undrained Rotational Stress Path on a Granular Soil=交替扭轉不排水應力路徑對砂質土壤應力--應變與屈伏行為之影響 |
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作者 | 陳怡睿; | 書刊名 | 長榮學報 |
卷期 | 3:1 1999.06[民88.06] |
頁次 | 頁83-100 |
分類號 | 441.12 |
關鍵詞 | 中空圓柱試體; 砂質土壤; 交替扭轉剪力; 應力; 應變; 屈伏函數; Hollow cylinder; Granular soil; Rotational shear; Stress-strain relation; Yield function; |
語文 | 英文(English) |
中文摘要 | 本文旨在探討砂質土壤在交替扭轉不排水應力路徑作用下對應力-應變與屈伏行為 的影響,其中包括中空圓柱土體承受不排水交替扭轉剪力之試驗結果,並針對砂質土之屈伏 行為,將試驗結果與多種數值屈伏函數做系列之比較。在交替扭轉作用下,土體初始平均有 效應力持續地漸減,直到有效應力比出現重複性迴圈的現象,此應力迴圈乃是砂質土交替產 生重複性壓縮與膨脹的現象。此時,剪應變與軸差應變則顯現不對稱螺旋狀之漸增趨勢,此 不對稱螺旋狀之應變在趨近三軸伸張狀態時,會產生較顯著之應變。試驗資料亦顯示,在交 替扭轉作用下應變率之方向,介於應力路徑方向與Mohr-Coulomb屈伏平面法線方向之間。在 數值函數之模擬上,本研究乃採不排水三軸壓縮試驗所得之摩擦角為參數;由試驗數據與屈伏 函數之比較結果顯示,Wang et al.及Matsuoka所提出之屈伏函數,大體上與試驗結果相互 契合;而Mohr-Coulomb理論之屈伏函數則在伸張應力狀態時,其最大應力比顯示些微的超估。 |
英文摘要 | Experimental and numerical study of stress-strain and yielding behavior in undrained rotational shear tests on a fine sand are presented. They include the testing results obtained from the hollow cylinder specimens tested in the undrained rotational shear and comparisons of yielding behavior in between experiments and some existing numerical yielding functions. After a number of rotational shear cycles, p' decreased and the effective stress ratio path approached a repetitive loop. At this stage, the sand tended to go through cycles of contraction and dilation. The magnitude of shear and deviatoric strain continuously increased in an unsymmetrical spiral pattern with larger strain developing during portions of the path near triaxial extension. Deviatoric strain increment vectors indicate non-associative flow during rotational shear. The directions of strain rate appeared to be in between the stress path and the normal to a Mohr-Coulomb failure surface. The yielding shape functions proposed by Wang et al. and Matsuoka both fit the experimental results reasonably well. For conventional Mohr-Coulomb criterion, the theoretical yield surface only fits the stress ratio of the undrained compression data while slightly overestimating the peak stress ratio measured in undrained extension. |
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