ABSTRACT
Recycled plastic pins (RPP) were first used for slope stabilisation in Missouri and Kansas in 1999, and after that they were successfully used in many other locations within those states. The University of Texas at Arlington team worked with the Texas Department of Transportation, Dallas District to implement slope stabilisation using RPPs. Based on the laboratory investigation results, all of the collected soil samples were classified as high-plasticity clay soil, according to the Unified Soil Classification System. The project site was located in the Eagle Ford geological formation, which is composed of residual soils consisting of clay and weathered shale, underlaid by unweathered shale. MPS-1 water potential probes were used to measure the matric suction of the soil. Instrumentation of the slope, using moisture sensors, water potential probes and a rain gauge, was carried out in the months of November and December 2010.
