نوع مقاله : مقاله کامل پژوهشی
1 گروه مهندسی عمران، واحد قزوین، دانشگاه آزاد اسلامی، قزوین، ایران
2 گروه مهندسی عمران و محیط زیست، دانشگاه نیوهمشایر، آمریکا
عنوان مقاله [English]
Due to the economic and environmental problems of using traditional stabilizers such as cement and lime, the use of new soil improvement methods such as biological methods has been considered by geotechnical engineers. Due to the existence of large areas in the world and Iran with different environmental conditions, it is necessary to evaluate the efficiency of soil stabilization in different environments and in this regard, it is necessary to study the effect of environmental conditions on the efficiency of modern biological stabilization. On the other hand, in designing a geotechnical structure, two factors of resistance and deformation should be considered, so in this study, the effects of melting and freezing cycles on the deformation parameters of biologically stabilized sand are evaluated and various factors such as all-round pressure, number Melting and freezing cycles Temperature changes in each cycle and the duration of each cycle are evaluated. For this purpose, non-drained reinforced static triaxial tests are performed and the deviation-axis-strain stress curves, chord stiffness (Esec), tangential stiffness (Etan), stiffness equal to 50% of maximum resistance (E50) and absorbed energy (EA) are performed. ) Is evaluated. The Taguchi method is used to design experiments and provide a relationship to predict some deformation parameters. The results of this study show that the application of melting and freezing cycles reduces the deformation parameters of stabilized samples. The destructive effect of melting and freezing cycles on hardness is greater than the absorbed energy.