Recycled Plastic Pins (RPP) are predominantly high density polyethylene materials that are fabricated from recycled plastics and other waste materials. It is a light weight material and less susceptible to chemical and biological degradation. The environmental resistant behavior of RPP makes it an attractive alternative compared to other degradable structural materials. Previous study indicates that RPP was successfully utilized for slope stabilization, arch bridges and piles. The current study presents the application of RPP as a temporary lateral support of a concrete retaining wall footing on a slope. The slope is located along highway Loop 12 near Union Pacific Rail Road (UP RR) over pass in Dallas, Texas. The concrete retaining wall is located at the middle of the slope that divided it into top and bottom slope. The crest of the top slope settled as much as 30 cm and footing of the retaining wall slid away from the top slope and resulted severe cracks near a construction joint. The site investigation program indicated that the sliding of the retaining wall occurred due to lack of lateral support. As a temporary remedial measure for 1-2 years, certain sections of the slope were reinforced using RPP. The spacing of RPP at the top and bottom slope was 0.9 m c/c and 1.2 m c/c, respectively. In addition, the first row of RPP at bottom slope was installed at the edge of the retaining wall footing and smaller spacing (0.6 m c/c) was provided near the critical cracked zone to provide additional resistance. After installation, topographic survey was conducted on monthly basis to monitor the lateral displacement of the stabilized slope. The field performance results indicated that the top of the retaining wall displaced as much as 15 to 20 cm after installation of RPP. On the other hand, 4 to 12 cm displacement was observed at the bottom of the wall which was less compared to the displacement at the top. RPP at the bottom slope provided resistance against the sliding and resulted less displacement at bottom slope.
展开▼
机译：再循环塑料销（RPP）主要是由再生塑料和其他废物制成的高密度聚乙烯材料。它是一种轻质的材料，易受化学和生物降解的易感性。与其他可降解的结构材料相比，RPP的环境抗性行为使其成为有吸引力的替代品。以前的研究表明，RPP已成功用于坡稳定，拱桥和桩。目前的研究呈现RPP作为斜坡上的混凝土挡土墙脚踏的临时侧向支撑。斜坡沿着在德克萨斯州达拉斯的通行证附近的高速公路循环12靠近联盟太平洋铁路（UP RR）。混凝土挡土墙位于斜坡的中间，将其分成顶部和底部斜率。顶部斜坡的嵴尽可能多地落在30厘米，挡住墙体远离顶部坡度，并导致建筑接头附近产生的严重裂缝。现场调查方案表明，由于缺乏侧向载体，挡土墙的滑动发生。作为1-2岁的临时补救措施，使用RPP加固斜率的某些部分。顶部和底部斜率的RPP间距分别为0.9M C / C和1.2M C / C.另外，底部斜面的第一行RPP安装在保持壁脚的边缘处，并且在临界裂纹区域附近提供较小的间距（0.6M C / C），以提供额外的电阻。安装后，全貌调查按月进行，以监测稳定坡度的横向位移。现场性能结果表明，在安装RPP后，保持壁的顶部位移多达15至20厘米。另一方面，与顶部的位移相比，在壁的底部观察到4至12cm位移。底部斜面的RPP提供了抵抗滑动的电阻，并导致底部斜率的较少位移。
展开▼
