Settlement Analysis of Back-to-Back Reinforced Retaining Walls

Palat, A (2014) Settlement Analysis of Back-to-Back Reinforced Retaining Walls. Masters thesis, Indian Institute of Technology, Hyderabad.

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Abstract

Mechanically Stabilized Earth (MSE) walls are one of the most common soil-retaining structures in the world. They are cost-effective soil-retaining structures that can tolerate large settlements compared to conventional gravity retaining walls. MSE walls are also an economical way to meet everyday earth retention needs for highway and bridge grade separations, railroads, commercial and residential developments. However, available literature and design guidelines for back-to-back MSE walls are limited. This study was conducted to investigate the effect of reinforced back-to-back MSE walls on wall settlements and facing deformations. Models of unreinforced and reinforced retaining walls were modeled and compared using commercially available finite element package PLAXIS 2D and a finite difference package FLAC 2D. Parametric studies were performed to determine the effect of types of facing, spacing between the reinforcements, axial stiffness of reinforcement, friction angles of backfill and foundation soil on foundation settlement, surface settlement, and horizontal displacement of the facing panel. The effects of varying spacing between reinforcements, and friction angle of backfill soil on the critical failure surface and the tension developed in the reinforcements were also studied.

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