ABSTRACT

This paper experimentally studies the efficiency of a multi-task geosynthetic comprised of a geogrid and a nonwoven geotextile layer in diminishing the required thickness of base course constructed over different soft subgrades in container yards pavements. In this research, a total number of 24 laboratory static plate load tests (PLT) were conducted in a large-scale steel test box. In all tests, the reinforcement was embedded at the interface of the base course and subgrade to get both reinforcing and separation functions involved simultaneously. The investigated parameter was bearing capacity coefficient K₃₀ obtained directly from the results of laboratory PLTs through a 305 mm-diameter circular steel plate. Results illustrated that in the case of composite-geosynthetic inclusion, the required thickness of the base course could be reduced from 17 to 23 percent depending on the strength of the underlying subgrade layer. This could be both economically and environmentally instrumental in real heavy-duty pavement design. Moreover, considering the geosynthetic end-fixation led to better functionalities of all reinforcements in fixed-end models compared to free-end ones. The results also demonstrated that the efficiency of the geocomposite is contingent on the thickness of the base course. As the thickness increases, the efficiency of the reinforcement reduces.

摘要

本文通过实验研究了由土工格栅和非织造土工织物层组成的多任务土工合成材料在减少集装箱堆场路面不同软路基上建造的基层所需厚度方面的效率。在这项研究中，在大型钢试验箱中进行了总共 24 次实验室静板载荷试验（PLT）。在所有的测试中，加固都嵌入在基层和路基的交界处，以同时获得加固和分离功能。研究参数为承载力系数K ₃₀通过直径为 305 毫米的圆形钢板直接从实验室 PLT 的结果中获得。结果表明，在复合土工合成夹杂物的情况下，根据下伏路基层的强度，所需的基层厚度可以从 17% 减少到 23%。这在真正的重型路面设计中既经济又环保。此外，考虑到土工合成材料的端部固定，与自由端模型相比，固定端模型中所有增强材料的功能更好。结果还表明，土工复合材料的效率取决于基层的厚度。随着厚度的增加，增强的效率降低。