Cyclic and post-cyclic geocell pullout behavior in cohesionless soil

IF 1.4 4区工程技术 Q2 ENGINEERING, MULTIDISCIPLINARY

Scientia Iranica Pub Date : 2023-10-09 DOI:10.24200/sci.2023.60817.7002

Ali Namaei-kohal, Alireza Ardakani, Mahmoud Hassanlourad

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引用次数: 0

Abstract

As a geocell reinforced structure can be subjected to earthquake and pullout loads during its life time, it is obligatory to assess the pullout capacity and soil-geosynthetic interaction of geocell under cyclic loads. This research investigated the cyclic and post-cyclic pullout behavior of geocell in cohesionless soil using a series of 24 multi-stage pullout tests. The results indicated that the ultimate post-cyclic pullout load was less than the monotonic pullout load. This was the result of a reciprocating motion from loading caused by the interlock between the geocell infill soil and the surrounding material, which weakened and broke during the cyclic phase. It was found that, as the grain size of the soil increased, the interlocking strength increased and consequently the ultimate post cyclic pullout load increased. The soil particle size had a significant effect on the cumulative displacement during the cyclic phase. Furthermore, the increases in the loading amplitude and the number of cycles decreased the interlocking resistance of the infill soil with the surrounding material, which decreased the ultimate post-cyclic pullout load. The effect of the loading frequency likely depended on the geocell infill soil density.

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无黏性土的循环和后循环土工格室拉拔行为

土工格室加筋结构在其寿命期内会受到地震和拉拔荷载的作用，因此对其在循环荷载作用下的拉拔能力和土-土工合成物相互作用进行评估是必要的。本文通过24次多阶段拉拔试验，研究了无黏性土体中土工格室的循环和后循环拉拔行为。结果表明，后循环极限拉拔荷载小于单调拉拔荷载。这是由于土工格室填充土与周围材料之间的互锁引起的载荷往复运动的结果，这种互锁在循环阶段减弱并破裂。结果表明，随着土体粒径的增大，联锁强度增大，循环后极限拉拔荷载增大。在循环阶段，土壤粒径对累积位移有显著影响。加载幅值和循环次数的增加降低了填土与周围材料的互锁阻力，从而降低了循环后的极限拉拔荷载。加载频率的影响可能与土工格室填土密度有关。

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

Scientia Iranica 工程技术-工程：综合

CiteScore

2.90

自引率

7.10%

发文量

审稿时长

2 months

期刊介绍： The objectives of Scientia Iranica are two-fold. The first is to provide a forum for the presentation of original works by scientists and engineers from around the world. The second is to open an effective channel to enhance the level of communication between scientists and engineers and the exchange of state-of-the-art research and ideas. The scope of the journal is broad and multidisciplinary in technical sciences and engineering. It encompasses theoretical and experimental research. Specific areas include but not limited to chemistry, chemical engineering, civil engineering, control and computer engineering, electrical engineering, material, manufacturing and industrial management, mathematics, mechanical engineering, nuclear engineering, petroleum engineering, physics, nanotechnology.