以串聯之單向度壓密儀測定粘土壓縮性

Determination of Compressibility of Clays by Using Oedometers Connected in Series

馮道偉(Tao-Wei Feng) ； 李宜娟(Yi-Jiuan Lee) ； 曹力夫(Li-Fu Chu)

《中原學報》 30卷3期 (2002/09) Pp. 285-293

https://doi.org/10.6358/JCYU.200209.0285

摘要

傳統的單向度壓密試驗係以一1.9 cm高的壓密環盛裝土壤試樣，且在試驗進行中僅量測試樣的總垂直壓縮量，此等數據對研究試樣之壓密行為並不足夠。為研究粘土在主壓密過程中之依時壓縮特性，特製作串聯式的單向度壓密儀，並以之進行數組壓密試驗，從中量測試樣內部之垂直壓縮量及超額孔隙水壓，從而分析得到壓縮性參數之值。此等分析而得的數據顯示，粘土在主壓密過程中具潛變性質，而潛變速率呈現非常數的特性，且先前研究採用之壓密基本組合方程式獲得驗証。本文所提的串聯式單向度壓密儀可用來測得壓密試樣內部的壓密狀況，因此是研究粘土壓密行為之重要新型儀器。

關鍵字

粘土 ； 主壓密 ； 壓縮性 ； 壓密儀

並列摘要

The conventional oedometer uses a consolidation ring of 1.9 cm in height to hold a soil specimen. During the oedometer test only the vertical compression of the specimen is measured. This is insufficient for studying the consolidation behavior of soils. In order to study the time dependent compressibility behavior of clays during the primary consolidation, a special consolidation apparatus is built where oedometers are connected in series so that the thickness of the specimens are added up. Samples of two soils are used in the test program to measure both the vertical compression and the excess pore water pressure of the specimens. The obtained data are then used to evaluate the values of the consolidation parameters de/dt, dσ/ dt, (The equation is abbreviated).The results of analyses on the values of the consolidation parameters show that clay posses creep behavior during primary consolidation and the creep rate is not a constant. The constitutive equation of one-dimensional consolidation in previous study is verified with the sedata. The oedometers connected in series can be used to measure consolidation condition within the soil specimen during primary consolidation. Therefore, it is a valuable research apparatus in studying the consolidation behavior of clays.

並列關鍵字

clay ； primary consolidation ； compressibility ； oedometer test