چكيده به لاتين
This thesis investigates the stability of geotextile-reinforced walls subjected to a vertical constant load applied to a strip footing. A series of centrifuge tests were conducted to evaluate the effects of different factors including width and geometry of strip footing, positions of loading from the crest of the wall and pressure of strip footing while slope angle, soil density and type of geotextile were maintained constant. Centrifuge models tests performed using nonwoven fabrics as reinforcement elements. Instead of a continuous loading by a jack, a constant load applied on strip footing from the start of the test. However a full water bag in front of the reinforced wall, prevented deformation of wall until reaching flight target acceleration. At this acceleration, the internal pressure of water inside the bag released so that the wall could deform. All of deformations and changes in the models were monitored by different cameras. The results reveal that when a constant load will be used instead of a continuous increasing load by a jack, the geometry of failure surface will be different in which sliding surface didn’t start from the backside of the strip footing and always was not curved. Also the failure mechanism and its geometry, movement of wall crest and strip footing and face displacement were largely influenced by the load, width and position of the strip footing. By increasing the distance between strip footing and the crest of reinforced soil wall or reducing the pressure of strip footing, the failure acceleration increased and movement of wall crest and strip footing and face displacement reduced. It was also observed that the maximum strain of reinforcement materials always occurred in upper half of the model, especially in second layer.
