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ABSTRACT
A large number of studies have been conducted recently to investigate the influence of randomly oriented fibers on some engineering properties of cohesive and cohesionless soils. However, few studies have been carried out on fine-grained soils reinforced with natural fibers. In this study, a series of triaxial testing (unconsolidated-undrained) and freeze-thaw tests were conducted in laboratory environment in order to investigate the effects of chicken quills dispersed randomly in high plasticity clay on freeze-thaw behavior. Chicken quill percentage was chosen as 0.5%, 1%, and 1.5% of the total dry weight of the reinforced soil. The numbers of freeze-thaw cycles were taken as 5 and 10. As a result of the experiments, it was determined that, the dzeviatoric stress of unreinforced samples caused a decrease when the freeze-thaw cycles increased. However, the deviatoric stress remarkably increases with increasing fiber ratio in different confining pressures, for 5 and 10 freeze-thaw cycles.
在不排水加载冻融循环对压实的鸡羽毛粘土复合材料强度性能的影响
最近大量已经进行的研究，调查随机排列的纤维对粘性和无粘性土的工程性能的影响。然而，很少有已经进行天然纤维增强细粒土的研究。在这项研究中，一系列的三轴试验（松散的无排水）和冻融试验实验室环境下，研究随机分散的鸡羽毛在高塑性粘土冻融性能影响。鸡羽毛的百分比为加筋土总干重的0.5%，1%，和1.5%。冻融循环次数分别为5和10。作为实验的结果，确定，冻融循环次数的增加，样品的偏应力降低。然而，5和10次冻融循环，随着在不同围压下的增加纤维的比例，偏应力显著增大。