Ural Nazile, Gunduz Zeki
Department of Civil Engineering, Bilecik Şeyh Edebali University, 11210 Bilecik, Turkey.
Department of Civil Engineering, Sakarya University, 54400 Adapazari, Turkey.
ScientificWorldJournal. 2014 Jan 30;2014:635763. doi: 10.1155/2014/635763. eCollection 2014.
The engineering behavior of nonplastic silts is more difficult to characterize than is the behavior of clay or sand. Especially, behavior of silty soils is important in view of the seismicity of several regions of alluvial deposits in the world, such as the United States, China, and Turkey. In several hazards substantial ground deformation, reduced bearing capacity, and liquefaction of silty soils have been attributed to excess pore pressure generation during dynamic loading. In this paper, an experimental study of the pore water pressure generation of silty soils was conducted by cyclic triaxial tests on samples of reconstituted soils by the slurry deposition method. In all tests silty samples which have different clay percentages were studied under different cyclic stress ratios. The results have showed that in soils having clay content equal to and less than 10%, the excess pore pressure ratio buildup was quicker with an increase in different cyclic stress ratios. When fine and clay content increases, excess pore water pressure decreases constant cyclic stress ratio in nonplastic silty soils. In addition, the applicability of the used criteria for the assessment of liquefaction susceptibility of fine grained soils is examined using laboratory test results.
非塑性粉土的工程特性比黏土或砂土的特性更难描述。特别是，鉴于世界上一些冲积沉积地区（如美国、中国和土耳其）的地震活动，粉土的特性显得尤为重要。在一些灾害中，大量的地面变形、承载能力降低以及粉土的液化都归因于动态加载过程中产生的超孔隙水压力。本文通过对采用泥浆沉积法制备的重塑土样进行循环三轴试验，对粉土的孔隙水压力产生进行了试验研究。在所有试验中，研究了不同黏土含量的粉土试样在不同循环应力比下的情况。结果表明，对于黏土含量等于或小于10%的土，随着不同循环应力比的增加，超孔隙水压力比的增长更快。当细颗粒和黏土含量增加时，非塑性粉土在恒定循环应力比下的超孔隙水压力会降低。此外，利用实验室试验结果检验了所采用的细粒土液化敏感性评估标准的适用性。
