Effects of rockfall shape on deformation performance of ground reinforced embankments subjected to lateral impact

IF 4.7 1区 工程技术 Q1 ENGINEERING, GEOLOGICAL Geotextiles and Geomembranes Pub Date : 2024-05-16 DOI:10.1016/j.geotexmem.2024.04.009
Liang Xiao , Liang Lu , Lanxing Li , Zongjian Wang , Katsuhiko Arai
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Abstract

Ground reinforced embankment (GRE) is an economical and efficient protection measure against rockfalls. In various design guidelines of ground reinforced embankments, the impact force of the rockfall is the principal factor, which is significantly affected by rockfall shape. This article conducts real scale tests and numerical tests to observe the external deformation behavior and the internal dynamic response of GREs subjected to lateral impact. Five shapes of the rockfalls corresponding to three contact types are set up in the tests. The experimental results show that the impact surface shapes of the rockfalls govern the penetration deformation patterns of the embankments, and the deformation extent of the disturbed soils. For different contact types between rockfalls and construction materials, the failure mode of the geosynthetics and the displacement distribution of the disturbed soils are distinguishing. The disturbed soils can be divided into two parts, the part surrounds the rockfall mainly expands laterally, and the rest is extruded and slips backward. Basically, the sharpness of the rockfall results in the deeper penetration and the smaller impact force. The influence of the rockfall shape needs to be carefully considered in the design of ground reinforced embankments.

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落石形状对受到横向冲击的地面加固路堤变形性能的影响
地面加固堤坝(GRE)是一种经济有效的落石防护措施。在各种地面加固堤坝的设计准则中,落石的冲击力是主要因素,而落石的形状对冲击力的影响很大。本文通过实际规模试验和数值试验来观察 GREs 在受到侧向冲击时的外部变形行为和内部动态响应。试验中设置了五种形状的落石,分别对应三种接触类型。实验结果表明,落石的冲击面形状决定了路堤的渗透变形模式和受扰动土壤的变形范围。对于落石和建筑材料之间的不同接触类型,土工合成材料的破坏模式和受扰动土壤的位移分布是有区别的。受扰动的土体可分为两部分,环绕落石的部分主要是横向扩展,其余部分则受到挤压而向后滑动。从根本上说,落石的尖锐程度会导致较深的渗透和较小的冲击力。在设计地面加固路堤时,需要仔细考虑落石形状的影响。
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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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