Investigation of soil arching in GRPS embankments under localized loading: Multi-span spring-based trapdoor model test

IF 4.7 1区工程技术 Q1 ENGINEERING, GEOLOGICAL

Geotextiles and Geomembranes Pub Date : 2024-08-17 DOI:10.1016/j.geotexmem.2024.07.008

Jie Zhou , Ling Zhang , Mengchao Deng , Zeyu Xu , Shuai Zhou , Wenzhe Peng

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引用次数: 0

Abstract

A novel multi-span spring-based trapdoor apparatus has been developed to simulate more realistically the coupling of piles, soft soil, and geosynthetics, as well as the intricate interactions between adjacent soil arches under localized loading within geo-reinforced pile-supported (GRPS) embankments. By employing movable blocks with varying spring stiffnesses, this study advances the understanding of the coupling effect between piles, soft soil, and geosynthetics. Utilizing digital image correlation (DIC) technology, the research captures the dynamic evolution of soil arch shapes, providing new insights into stabilization mechanisms within GRPS embankments. It is found that lateral geosynthetics can effectively reduce the overall settlement of the embankment and mitigate the influence of trapdoor stiffness on the soil arch height. The geo-reinforcement enhances the stability of soil arches under localized loading by providing essential support to the arch feet of multiple internal soil arches. Four distinct stages in soil arch evolution under localized loading have been identified. The relationship between geo-reinforcement stiffness and trapdoor stiffness in affecting soil arching is complex and varies with different loading scenarios. The membrane effect plays a pivotal role in inter-span load transfer.

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局部荷载作用下 GRPS 路堤土壤拱起的研究：基于弹簧的多跨活门模型试验

为了更真实地模拟土工加固桩支撑（GRPS）堤坝中桩、软土和土工合成材料之间的耦合，以及在局部荷载作用下相邻土拱之间错综复杂的相互作用，我们开发了一种新型的多跨弹簧活门装置。通过采用具有不同弹簧刚度的活动块，本研究加深了对桩、软土和土工合成材料之间耦合效应的理解。研究利用数字图像相关（DIC）技术捕捉了土拱形状的动态演变，为了解 GRPS 路堤的稳定机制提供了新的视角。研究发现，横向土工合成材料可有效减少路堤的整体沉降，并减轻活门刚度对土拱高度的影响。土工加固材料可为多个内部土拱的拱脚提供重要支撑，从而增强土拱在局部荷载作用下的稳定性。已确定土拱在局部荷载作用下演变的四个不同阶段。土工加固刚度与活门刚度之间影响土拱的关系非常复杂，并随不同的加载情况而变化。膜效应在跨间荷载传递中起着关键作用。

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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.