Monotonic and cyclic oedometer tests on sand at high stress levels
Monotonic and cyclic oedometer tests on sand at high stress levels
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DOI：
10.1007/s10035-005-0216-z
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发表时间：
2006-03
期刊：
影响因子：
2.4
通讯作者：
Eris Uygar;Ata G. Doven
中科院分区：
文献类型：
--
作者：
Eris Uygar;Ata G. Doven
本文采用测径仪试验方法，研究了均匀级配细砂在高应力水平下的一维压缩特性。为了达到较高的应力水平，测试以应变控制的方式进行。此外，在较低的应力水平下也采用标准应力控制试验方法进行比较。试样制备的初始相对密度范围从松散到密集，经受正常加载，以及滞后和重复加载模式。结果表明，压缩系数与相对密度呈线性关系。压缩强度主要受淹没程度的影响，其中压缩性能取决于初始地层密度。无论初始地层密度如何，迟滞加载样品的压缩指数趋同，而重复加载的重整样品的压缩指数则连续变化。
In this paper, one-dimensional compression behavior of uniformly graded fine sand is studied with the use of oedometer test at elevated stress levels. To reach the elevated stress levels, testing is performed in a strain controlled manner. In addition, standard stress controlled testing method is also used at lower stress levels for the purpose of comparison. Specimens prepared with initial relative densities ranging from loose to dense are subjected to normal loading as well as hysteretic and repeated loading patterns. Results showed that there is a linear relationship between compressibility index and relative density. The magnitude of compression is mainly influenced by inundation where the compressibility behavior is found to be depending on the initial formation density. Regardless of the initial formation density, convergence to a similar compression index is observed with the hysteretically loaded samples whereas a continuous modification was obtained with repetitively loaded reformed specimens.