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題 名 | 路基土壤回彈模數及其循環硬化/軟化行為=Resilient Modulus and Hardening/Softening Behavior of Subgrade Soil under Repeated Loading |
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作 者 | 楊樹榮; 黃偉慶; 廖啟州; | 書刊名 | 中國土木水利工程學刊 |
卷 期 | 19:1 2007.03[民96.03] |
頁 次 | 頁147-154 |
分類號 | 441.12 |
關鍵詞 | 路基土壤; 回彈模數; 反覆載重; 循環硬化/軟化; Resilient modulus; Repeated loading; Hardening; Softening; |
語 文 | 中文(Chinese) |
中文摘要 | 本文針對凝聚性路基土壤進行10,000次反覆載重三軸試驗,並對部分試驗施以100,000次至500,000次反覆載重,藉以瞭解回彈模數在高軸次反覆載重下之變化情形。研究結果顯示,於最佳含水量下,路基土壤受低應力水準作用時,回彈模數有循環硬化之行為,但於高應力水準下重覆加載至一定次數後開始軟化;而在最佳含水量濕側時,回彈模數皆呈現循環硬化行為。最後,並以迴歸方式建立回彈模數循環硬化/軟化函數,以描述路基土壤回彈模數隨載重次數變化之情形。 |
英文摘要 | Standard test methods for resilient modulus of subgrade soils regulate the experiment with limited number of load repetitions to reduce testing time. However, a pavement is likely to incur millions of traffic loads in its service life. This study conducted triaxial tests on 2 cohesive soils for 10,000 load repetitions, with some specimens subjected to 100,000 or 500, 000 load repetitions, to characterize the behavior of cohesive subgrades under repeated loading. Experimental results show that, at optimum moisture content (OMC), the resilient modulus of cohesive subgrades exhibits gradual hardening behavior under low stress level. At high stress levels, soil tends to soften after a specific number of load applications. At the wet side of OMC, the resilient modulus of soil descends initially and then rises as the number of load application increases. To describe the behavior of subgrade soil under repetitive loading, a prediction model incorporating the hardening/softening behavior for resilient modulus is established. |
本系統中英文摘要資訊取自各篇刊載內容。