评估沟槽回填土中的拱形 EPS 块和土工格室夹杂物,以保护埋设的柔性管道

IF 4.7 1区 工程技术 Q1 ENGINEERING, GEOLOGICAL Geotextiles and Geomembranes Pub Date : 2024-03-30 DOI:10.1016/j.geotexmem.2024.03.008
S.N. Moghaddas Tafreshi , N. Joz Darabi , M. Azizian , B.C. O'Kelly , A. Faramarzi
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引用次数: 0

摘要

本文介绍了一项实验研究,探讨了采用弧形发泡聚苯乙烯(EPS)砌块拱绕埋设的柔性管道上部,以减少对其产生的压力,从而减少由此产生的变形/挠度的新思路。进行了大规模测试,以检验埋有直径为 250 毫米塑料管(内侧深度为 0.75 米)的修复沟槽在承受模拟车辆交通的循环表面荷载时的主要性能指标。实际规模的模型试验研究了未加固和土工格室加固的沟槽,沟槽采用传统的矩形和不同形状的 EPS 块状内含物,这些内含物被放置在埋设管道的冠部上方或紧贴管道的上部。与传统的矩形 EPS 块料相比,弧形拱状 EPS 块料能更大程度地降低作用在埋设管道上的压力,从而大大减小管道的变形/偏移。覆盖在 EPS 块料上的土工格室层大大减少了对高压缩性 EPS 材料的压力,从而减少了其压缩和沟槽表面沉降。最佳沟槽修复方案包括土工格室层和安装在管道上部周围的 75 毫米厚的弧形拱形 EPS 块。将 EPS 块的厚度增加一倍只能适度减少管道的挠度,但会显著增加沟槽表面的沉降。
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Evaluation of arched EPS block and geocell inclusions in trench backfill for protection of buried flexible pipes

This paper presents an experimental investigation examining the novel idea of employing curved expanded-Polystyrene (EPS) blocks that arch around the upper section of buried flexible pipes to reduce the pressures acting on them and hence resulting deformation/deflections. Large-scale testing was performed to examine key performance indicators for reinstated trenches with buried 250-mm diameter plastic pipe (0.75-m invert depth) when subjected to cyclic surface loading simulating vehicular traffic. The real-scale model tests investigated unreinforced and geocell-reinforced trenches with conventional rectangular and differently shaped EPS block inclusions placed above the crown or fitting snugly around the upper section of the buried pipes. Compared to conventional rectangular EPS block, the curved-arched EPS block produced greater reductions in the pressures acting on the buried pipes, resulting in substantially smaller pipe deformation/deflections. The geocell layer overlying the EPS block significantly reduced the pressures bearing on the highly compressible EPS material, thereby reducing its compression and the trench surface settlement. Optimum trench reinstatements incorporated both the geocell layer and a 75-mm thick curved-arched EPS block fitted around the top section of the pipe. Doubling the EPS block thickness produced only modest reductions in the pipe deflections, but significantly increased the trench surface settlement.

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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.
期刊最新文献
Experimental study on vacuum preloading combined with intermittent airbag pressurization for treating dredged sludge Corrigendum to “Seismic response and mitigation measures for T shape retaining wall in liquefiable site” [Geotext. Geomembranes. 53(1), (2025) 331–349] Seismic response and mitigation measures for T shape retaining wall in liquefiable site Stress-strain responses of EPS geofoam upon cyclic simple shearing: Experimental investigations and constitutive modeling A large-size model test study on the consolidation effect of construction waste slurry under self-weight and bottom vacuum preloading
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