Full-scale accelerated testing of geogrid-reinforced inverted pavements

IF 4.7 1区 工程技术 Q1 ENGINEERING, GEOLOGICAL
Xi Jiang , Fengshou Zhang , Baoshan Huang , Hani Titi , Pawel Polaczyk , Yuetan Ma , Yanhai Wang , Zhiqiang Cheng
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Abstract

Decades of research has been dedicated to investigating inverted pavement as an alternative to traditional flexible pavement structures. While previous studies have largely focused on the stress dependency of the unbound aggregate base (UAB) layer using numerical simulations, there is limited research on the construction and use of geogrid reinforcement in inverted pavement. This study presents a comprehensive evaluation of full-scale inverted pavements, specifically assessing the impact of geogrid reinforcement on rutting performance. The results indicate that adding geogrid to the UAB layer improves rutting resistance, with optimal results achieved when the geogrid is placed in the upper third of the layer. On the other hand, when the geogrid was positioned in the bottom two-thirds of the layer, it led to inferior rutting performance compared to the inverted pavement where geogrid reinforcement was placed in the upper one-third of the UAB layer. Numerical simulations validate the field test results, demonstrating that higher tensile strains in the upper third location enhance aggregate interlocking and stiffness due to the geogrid's enhanced constraining capacity and reinforcement. Conversely, lower tensile strains in the bottom two-thirds location limit geogrid constraints, leading to increased rutting and surface deformation.

土工格栅加固倒置路面的全尺寸加速试验
几十年来,人们一直致力于研究倒置路面,将其作为传统柔性路面结构的替代方案。以前的研究主要集中在使用数值模拟来研究无粘结集料基层(UAB)的应力依赖性,而对倒置路面中土工格栅加固的施工和使用的研究却很有限。本研究对全尺寸倒置路面进行了全面评估,特别是评估了土工格栅加固对车辙性能的影响。结果表明,在 UAB 层中添加土工格栅可提高抗车辙性能,当土工格栅铺设在 UAB 层上三分之一处时,可达到最佳效果。另一方面,当土工格栅位于路面层底部三分之二处时,其车辙性能会比在 UAB 层上三分之一处进行土工格栅加固的倒置路面差。数字模拟验证了现场测试结果,表明由于土工格栅增强了约束能力和加固作用,上三分之一位置较高的拉伸应变可提高集料的互锁性和刚度。相反,底部三分之二位置较低的拉伸应变限制了土工格栅的约束能力,导致车辙和表面变形增加。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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来源期刊
Geotextiles and Geomembranes
Geotextiles and Geomembranes 地学-地球科学综合
CiteScore
9.50
自引率
21.20%
发文量
111
审稿时长
59 days
期刊介绍: The range of products and their applications has expanded rapidly over the last decade with geotextiles and geomembranes being specified world wide. This rapid growth is paralleled by a virtual explosion of technology. Current reference books and even manufacturers' sponsored publications tend to date very quickly and the need for a vehicle to bring together and discuss the growing body of technology now available has become evident. Geotextiles and Geomembranes fills this need and provides a forum for the dissemination of information amongst research workers, designers, users and manufacturers. By providing a growing fund of information the journal increases general awareness, prompts further research and assists in the establishment of international codes and regulations.
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