Abstract
Geosynthetic-reinforced soil bridge abutments can be constructed rapidly, at low cost, and with relatively low environmental impact. However, like all shallow foundations, they can be vulnerable to differential settlements. A full-scale abutment was constructed, instrumented, and subjected to carefully controlled differential settlements. The abutment performed well with respect to providing support at the level of the superstructure. However, the facing blocks (concrete masonry units, or CMUs) demonstrated susceptibility to removal following settlement of the abutment, and the backfill was exposed through gaps between adjacent CMUs. Three potential measures to mitigate this risk include pinning the CMUs near the corner of the abutment, adding a protective wrap behind the CMUs to encapsulate the fill, and increasing the base width of the abutment.
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