Improving clay-geogrid interaction: Enhancing pullout resistance with recycled concrete aggregate encapsulation

IF 4.7 1区工程技术 Q1 ENGINEERING, GEOLOGICAL

Geotextiles and Geomembranes Pub Date : 2024-08-06 DOI:10.1016/j.geotexmem.2024.07.010

Sajedeh Malek Ghasemi, Seyed Mohammad Binesh, Piltan Tabatabaie Shourijeh

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引用次数: 0

Abstract

In this study, Recycled Concrete Aggregate (RCA) was employed as a sandwich technique around the geogrid to enhance the pullout resistance of the geogrid in clayey backfills. Large-scale pullout tests were conducted on three configurations: geogrid-reinforced clay, geogrid-reinforced RCA, and geogrid sandwiched between layers of RCA, aimed at investigating pullout resistance and deformation. The experiments encompassed two different geogrid types (designated as G1 and G2), varying normal pressures ranging from 10 to 50 kPa, and RCA layers with thicknesses of 40, 80, 160, and 320 mm. Results from the experiments revealed that the inclusion of RCA layers around the geogrid substantially enhanced pullout resistance, with improvements ranging from 1.5 to 3 times compared to clay specimens. Optimal RCA thicknesses were determined in order to enhance soil-geogrid bonding and pullout resistance. For G1 geogrid, a thickness of 160 mm (equivalent to replacing 25% of clay volume with RCA) was identified as optimal, while for G2 geogrid, an 80 mm thickness (equivalent to replacing 15% of clay volume with RCA) was found to be sufficient. These thicknesses were established to achieve over 80% of the pullout force compared to full RCA specimens.

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改善粘土与土工格栅的相互作用：用再生混凝土骨料包裹增强抗拉强度

在这项研究中，采用了再生混凝土骨料（RCA）作为土工格栅的夹层技术，以增强土工格栅在粘性回填土中的抗拔能力。对三种配置进行了大规模拉拔试验：土工格栅加固粘土、土工格栅加固 RCA 以及夹在 RCA 层之间的土工格栅，旨在研究其抗拉拔性和变形情况。实验包括两种不同的土工格栅类型（分别称为 G1 和 G2）、10 至 50 千帕的不同法向压力以及厚度分别为 40、80、160 和 320 毫米的 RCA 层。实验结果表明，在土工格栅周围加入 RCA 层可大大提高抗拔能力，与粘土试样相比，抗拔能力提高了 1.5 到 3 倍。为了增强土壤与土工格栅之间的粘结力和抗拉强度，确定了最佳的 RCA 厚度。对于 G1 土工格栅，160 毫米的厚度（相当于用 RCA 替代 25% 的粘土体积）被认为是最佳厚度，而对于 G2 土工格栅，80 毫米的厚度（相当于用 RCA 替代 15% 的粘土体积）被认为是足够的。与完整的 RCA 试样相比，这些厚度可实现超过 80% 的拉拔力。

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来源期刊

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.