Experimental evaluation of back-to-back anchored walls by plate anchors

Document Type : Research Article

Authors

1 Ph.D. student, Department of Civil Engineering, Faculty of Civil & Earth Resources Engineering, Central Tehran Branch, Islamic Azad University, Tehran, Iran

2 Assistant Professor, Department of Civil Engineering, Faculty of Civil & Earth Resources Engineering, Central Tehran Branch, Islamic Azad University, Tehran, Iran

Abstract

The implementation of -anchored by anchor plates- retaining walls, is one of the most commonly used methods of stabilizing the embankments. Also, Back-to-Back Mechanically Stabilized earth walls (BBMSEW) is one of the types of so-called "mechanically stabilized earth walls with complex geometry", whereas their usages, has been less the subject of researches. So far, no special research has been done to investigate and analyze the behavior of anchored back-to-back retaining walls with anchor plates under the load of shallow foundations and the behavior and interaction of two walls with each other and the interaction of sliding surfaces of two walls and sliding surfaces of shear failure of subsurface soil. Since the effect of the interaction of two back-to-back walls with each other and the loading plate(shallow foundation model) with two walls due to the interference of their failure surfaces, strongly affects the foundation bearing capacity and stability of walls, so in this article by physical modeling, The effect of horizontal distance between two walls, dimensions of loading plate (shallow foundation model) on stability,  foundation bearing capacity, yield stress, soil failure model under foundations and behind the walls have been investigated and analyzed. In order to survey the shape, form and how the slip failure curves of the embankment behind the walls intersect, the Particles Image Velocimetry (PIV) technique has been used. The results show that the effective distance between the two back-to-back retaining walls anchored by anchor plates is about 2.5 times of their height. Also, the dimensions of the loading plate will affect the bearing capacity and the interference of the shear failure surfaces of the soil under the foundation and the slip failure surfaces of the walls. The results showed the effective breadth of the loading-plate is about equal to walls height. Finally, back-to-back anchored by anchor plates retaining walls in widths longer than 2.5 times of their height or shallow foundation greater wider than their height can be designed and analyzed individually.

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References

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Amirkabir Journal of Civil Engineering
Volume 54, Issue 6
September 2022
Pages 16-16

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