土壤小應變三軸試驗之發展與應用

Development of the Small Strain Triaxial Test on Soils and Its Application

龔東慶(Tung-Chin Kung) ； 歐章煜(Chang-Yu Ou)

《地工技術》 96期 (2003/06) Pp. 5-16

https://doi.org/10.30140/SG.200306.0001

摘要

早期由於三軸儀器功能之限制，一般傳統三軸試驗量測土壤應變量大約只能達到0.1～0.05%，造成土壤模式的發展和相關參數的選取都侷限於此應變範圍之試驗結果。然而越來越多的現地監測資料顯示，現地土壤因施工引致之應變量，除了靠近施工位置應力集中區域外，大都小於0.05%，因此近二十年來，國際大地工程界致力於發展土壤小應變試驗，包括三軸試驗儀器的改良以及小應變量測儀器的開發，土壤小應變之行為才逐漸為人所瞭解，也深深地影響後來更高階土壤模式的發展。本文詳細介紹進行小應變三軸試驗之發展，以及試驗結果在發展土壤模式和分析工程變形行為之應用。

關鍵字

小應變 ； 三軸試驗 ； 勁度 ； 局部應變

並列摘要

The strain of soils measured by the conventional triaxial apparatus can at best reach the value as small as 0.1~0.05%, beyond which is out of the functional limitation in the triaxial apparatus. The fact also limits the development of soil models and the selection of soil parameters. More and more field observation data, however, showed that soil strains induced by construction were mostly less than 0.05% except those within the stress concentration zone near the construction site. Accordingly, over the last twenty years, international geotechnical engineering circles have been devoted to developing small strain tests, including the improvement of the triaxial apparatus and the development of small strain instruments. Researchers thus gradually recognize the importance of the small strain behavior of soils, which deeply influences the development of later advanced soil models. This paper introduces the development of small strain triaxial tests in detail and its application to developing the soil models and the analysis of engineering behavior.

並列關鍵字

small strain ； triaxial test ； stiffness ； local strain