S, Sasanka Mouli and Umashankar, B and M R, Madhav
(2015)
Analysis of Back-To-Back Reinforced Retaining Walls with Modular Block Facing.
In: 50th Indian Geotechnical Conference, 17-19 Dec, 2015, Pune, India.
Abstract
Back-to-back reinforced retaining walls are mostly used in approach embankments for bridges and flyovers. Guidelines on the design of such walls are limited. According to FHWA codal provisions, the distance between back-to-back walls is an important parameter in estimating the lateral earth pressures on these walls. For back-to-back walls of height ‘H’ with backfill angle of shearing resistance ‘’, two cases are given in the code: a) the walls are sufficiently far away with the distance between the facings of reinforcements extending from the two walls (D) is greater than H*tan(45o-ϕ/2), the walls are designed as independent walls, and b) the ends of the reinforcements for the two walls overlap by a distance more than 0.3*H, the active lateral earth pressure is taken as zero while performing the check for external stability. If the distance between the walls is intermediate between these two cases, the lateral earth pressures of the walls are linearly interpolated. However, there is no literature available to justify the above mentioned earth pressure distribution for back-to-back reinforced walls. The objective of this study is to obtain the effect of distance between the far ends of reinforcements normalized with the wall height (D/H) on the lateral pressures at the facing of the wall and at the end of reinforcement. In this study, charts are proposed showing the variation of lateral pressures and facing displacements with depth for D/H varying from 0.0 to 0.6 and for different reinforcement stiffness ranging from 500 kN/m to 50000 kN/m.
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