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題名 | 飽和黏性土壤與鋼材間之摩擦特性= |
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作者 | 張惠文; 廖新興; 陳國隆; |
期刊 | 力學 |
出版日期 | 19930900 |
卷期 | 9:3 1993.09[民82.09] |
頁次 | 頁241-251 |
分類號 | 441.12 |
語文 | chi |
關鍵詞 | 飽和; 摩擦特性; 鋼材; 黏性土壤; 基椿; Cohesive soil; Pileasteel plate; Frictional property; |
中文摘要 | 本研究利用改良式直接剪力試驗儀,分別以固定土壤試體體積及固定垂直荷重之 方式,進行不排水及排水狀況下土壤與鋼材間之摩擦試驗,以探討樁材與飽和黏性土壤間之 長期及短期摩擦行為。由試驗結果發現對一定表面粗糙度之鋼材而言,鋼材與黏性土壤間之 摩擦強度隨有效垂直應力之增加而增大,但其摩擦係數則為定值,與土壤之應力歷史及應力 狀況無關。在排水情況下,鋼材與土壤間之相對位移及潛變速率因潛變荷重之增加而變大, 然而此情況下之相對位移及潛變速率均較相同條件之不排水情況為小。在不排水情況下,當 施加之潛變荷重達到摩擦強度之 70 %左右時,鋼材與正常壓密黏土間之相對位移及潛變速 率即有降服現象發生,但對過壓密黏土而言,隨著土壤過壓密比之增加,其摩擦應力之降服 情形有趨於緩和的趨勢。 |
英文摘要 | In this research, an improved type direct shear apparatus was used to conduct a series of frictional tests between cohesive soil and steel plate. The influences of drainage conditions, consolidation conditions, effective normal stress on the surface of pile material, creep loading and roughness of pile surface on the long-term and short term frictional properties between pile material and cohesive soil were investigated. From the analysis of experimental results, it is found that the frictional strength between the cohesive soil and the pile material will be increased with the increase of the effective normal stress, but the coefficient of friction will keep a constant for the same roughness of pile surface under various loading conditions. It is also found that the values of longterm frictional resistance depend ont he drainage conditionns. In drained condition, the values of frictional resistance of both the long-term or the short-term are almost the same. However, for the undrained condition of normally consolidated soil, the creeping rate and the long-term displacement yielded as the applied creep loading reached 70% of the short-term frictional strength. however, for overconsolidated clay, this yielding tendency will become not so apparent with the increase of OCR. Furthermore, under the long-term loading condition, the frictional behavior of rougher material comes nearer to that of the soil specimen. |
本系統之摘要資訊系依該期刊論文摘要之資訊為主。