The recycled plastic pin (RPP) is made from recycled plastics and waste materials (i.e., polymer, sawdust, fly ash, etc.). It is a lightweight material and is less susceptible to chemical and biological degradation than the alternative reinforcing element. RPPs are driven into the slope face and provide additional resistance along the slip surface which increases the factor of safety against shallow slope failure. The current paper summarizes a case study using RPPs to repair highway slopes, investigating the use of a finite element method, and summarizes a design method. The highway slope was located over US 287 near the St. Paul overpass in Midlothian, Texas. The surficial movement had taken place over the slope, resulting in cracks over the shoulder near the bridge abutment. Three 15.2-m sections over the slope were reinforced using RPPs. After RPP installation, the slope was instrumented with inclinometers, rain gauges, moisture sensors, and water potential probes, and was monitored periodically. The performance monitoring results indicated that RPP provides resistance in the slope constructed using highly plastic clay. Further analysis of the slope using finite element analysis indicates that RPP can significantly improve the marginal slopes to a factor of safety more than 2.0. Finally, a simple design chart is presented to calculate the capacity of RPPs for slope repair design using an infinite slope approach.

再生塑料销（RPP）由再生塑料和废料（例如，聚合物，锯末，粉煤灰等）制成。它是一种轻质材料，比其他增强元件更不易受到化学和生物降解的影响。RPP被驱动到斜坡表面，并沿滑动表面提供额外的阻力，从而增加了抵抗浅层斜坡破坏的安全系数。本文总结了使用RPP修复公路边坡的案例研究，研究了有限元方法的使用，并总结了一种设计方法。公路边坡位于德克萨斯州中洛锡安市的圣保罗立交桥附近的US 287上。表面运动发生在斜坡上，导致桥台附近的肩部出现裂缝。使用RPP加固了斜坡上的三个15.2米断面。在安装RPP之后，用倾斜仪，雨量计，湿度传感器和水势探头对斜坡进行检测，并定期进行监测。性能监测结果表明，RPP可在使用高塑性粘土建造的边坡中提供阻力。使用有限元分析对坡度进行进一步分析表明，RPP可以将边坡的坡度显着提高到安全系数超过2.0。最后，给出了一个简单的设计图，以使用无限边坡方法计算RPP进行边坡修复设计的能力。性能监测结果表明，RPP可在使用高塑性粘土建造的边坡中提供阻力。使用有限元分析对坡度进行进一步分析表明，RPP可以将边坡的坡度显着提高到安全系数超过2.0。最后，给出了一个简单的设计图，以使用无限边坡方法计算RPP进行边坡修复设计的能力。性能监测结果表明，RPP可在使用高塑性粘土建造的边坡中提供阻力。使用有限元分析对坡度进行进一步分析表明，RPP可以将边坡的坡度显着提高到安全系数超过2.0。最后，给出了一个简单的设计图，以使用无限边坡方法计算RPP进行边坡修复设计的能力。