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Family name: Yadegari Name: Shima
Title of Thesis :Investigation of Creep Behavior of Reinforced Sandy Soil with Geosynthetic Yarn in The Laboratory Condition
Supervisor(s): Alireza Negahdar
Advisor(s): Siab Houshmandi
Graduate Degree M.Sc.
Major: Civil Engineering Specialty: Geotechnical Engineering University: Mohaghegh Ardabili Faculty: Technical
Graduation date: 2014/09/09 Number of pages: 80
Abstract:
The compressibility behavior of soils is a main concern in geotechnical engineering when buildings, embankments, roads are built, large settlements can often be occured. Since the long settlements are due to the creep deformation, therefore the study of creep behavior of soil is necessary. When soil is subjected to a constant load, After the complete dissipation of the excess pore water pressure, deformation can be observed over a long period of time, which is known as the secondary compression or creep. Mechanisms and factors influencing on the creep behavior of sandy soils have not understood yet completely. In this study, one-dimensional single stage, stepwise and overloaded-unloaded consolidation creep tests are carried out on sandy clay soils and reinforced sandy clay soils with Geosynthetic yarn and the effect of reinforcing of soil, stress level, stress history and pore water on the creep behavior are investigated and the creep mechanisms are explained with respect to contacts and deformation of particles. Data analyses are explained based on relationship of the change in void ratio and coefficient of secondary compression. Test results show that at low stresses level in water satured samples, large amount of creep deformation is occurred, and with increament of stress level, creep deformation decreases, but in dry samples, stress increment increases creep deformation. Further, the rate of creep in overloaded-unloaded test is higher than that of the single stage test, and this accelerates the creep. In reinforced soil samples, with increament of percent of Geosynthetic yarn at same stress in satured samples creep deformation decreases and in dry samples creep deformation increases.

Keywords: Creep, Sandy clay soil, One dimentional consolidation test, Geotextile, Coefficient of secondary compression.
September – 2014

University of Mohaghegh Ardabili
Faculty of Technical and Engineering
Department of Civil Engineering

Thesis is approved for the degree of M.Sc
In Civil Engineering (Geotechnical Engineering)
Title:
Investigation of Creep Behavior of Reinforced Sandy Soil with Geosynthetic Yarn in The Laboratory Condition
By:
Shima Yadegari
Evaluated and

دسته بندی : No category

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