نوع مقاله : پژوهشی
نویسندگان
دانشکدهی مهندسی عمران و محیط زیست، دانشگاه تربیت مدرس
چکیده
کلیدواژهها
عنوان مقاله [English]
نویسندگان [English]
Geosynthetics have been proved suitable for reinforced soil retaining walls. Due to an increase in the use of geosynthetic reinforced soil systems in seismic active zones that bear frequent earthquakes, it is important to study the dynamic behavior of these structures. Hence, in this research, a study on the seismic behavior of Geosynthetic Reinforced Soil Retaining Walls (GRSRW) has been undertaken to present the earthquake equivalent horizontal acceleration coefficient for the model.
As long as no force is imposed on the reinforcement, the existence of reinforcement in the soil retaining wall has no effect, hence, using reinforcement is useful only when the applied forces cause reinforcement tension, and the mobilized tension force can overcome the soil tension weakness. Thus, predicting mobilized forces in geosynthetics during an earthquake is very important.
The pseudo-static method is a suitable and simple approach to substitute for dynamic analyses of slope stability. Therefore, this research endeavors to offer an equivalent pseudo-static coefficient using a similar approach for the reinforced soil retaining walls to equalize dynamic behavior. A fundamental requirement to assess conservatism in current design practice and to validate new design approaches is a reliable estimate of the load in reinforcement layers to maintain the stability of the reinforced structure. Based on considering forces in reinforcements (as the most important factor of stability), the earthquake equivalent horizontal acceleration coefficient is proposed. Comprehensive sensitivity analyses have been performed to study the effects of parameters on forces and displacements. The effects of the most important parameters, such as wall height, maximum acceleration, vertical spacing of reinforcements, types of reinforcement and soils, through numerical
modeling of geosynthetic reinforced soil retaining walls (GRSRW) under dynamic loading with the finite difference method using FLAC, have been investigated. The findings indicate rather positive results with each parameter.
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