Study on the mechanism of freeze-thaw cycles on the shear strength of geogrid-sand interface

IF 3.8 2区工程技术 Q1 ENGINEERING, CIVIL

Cold Regions Science and Technology Pub Date : 2024-07-15 DOI:10.1016/j.coldregions.2024.104275

Ya Meng , Chao Xu , Yang Yang , Chunxue Du , Bin Jia , Chongxi Zhao

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引用次数: 0

Abstract

The geogrid-soil interface characteristic is a critical factor influencing the behavior of reinforced soil structures. In seasonal frozen regions, the shear strength of the geogrid-soil interface fluctuates periodically with temperature, necessitating consideration of freeze-thaw cycle effects during engineering design. In this study, a series of large-scale direct shear tests were conducted to investigate the geogrid-sand interface behavior under different freeze-thaw cycles. The mechanism of the evolution and variation of the geogrid-sand interaction was discussed based on test results and the associated mesoscopic analysis. The results indicate that freezing enhances the shear strength of the geogrid-sand interface, whereas freeze-thaw cycles reduce the geogrid-sand interface shear stress. The cohesion and friction angle of the geogrid-sand interface decreased as the number of freeze-thaw cycles increased, but tended to stabilize after several freeze-thaw cycles. The influence of freeze-thaw cycles on the tensile strength and elongation of the geogrid was insignificant. Internal changes in sand during freeze-thaw cycles were considered as the key issue that led to the deterioration of the geogrid-sand interface. Furthermore, considering the interface cohesion and normal stress, the influence of freeze-thaw cycles on the interaction coefficient k between geogrid and soil was analyzed, which is referable for the design and application of reinforced soil engineering in cold regions under similar conditions.

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冻融循环对土工格栅-砂界面剪切强度的影响机理研究

土工格栅-土壤界面特性是影响加筋土壤结构行为的关键因素。在季节性冰冻地区，土工格栅-土界面的抗剪强度随温度的变化而周期性波动，因此在工程设计中必须考虑冻融循环效应。本研究进行了一系列大规模直接剪切试验，以研究土工格栅-砂土界面在不同冻融循环下的行为。根据试验结果和相关的介观分析，讨论了土工格栅-砂相互作用的演变和变化机理。结果表明，冻结增强了土工格栅-砂界面的剪切强度，而冻融循环降低了土工格栅-砂界面的剪应力。土工格栅-砂界面的内聚力和摩擦角随着冻融循环次数的增加而减小，但在几次冻融循环后趋于稳定。冻融循环对土工格栅的拉伸强度和伸长率的影响不大。冻融循环期间沙子的内部变化被认为是导致土工格栅-沙子界面恶化的关键问题。此外，考虑到界面内聚力和法向应力，分析了冻融循环对土工格栅与土体之间相互作用系数 k 的影响，为寒冷地区类似条件下加筋土工程的设计和应用提供了参考。

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来源期刊

Cold Regions Science and Technology 工程技术-地球科学综合

CiteScore

7.40

自引率

12.20%

发文量

209

审稿时长

4.9 months

期刊介绍： Cold Regions Science and Technology is an international journal dealing with the science and technical problems of cold environments in both the polar regions and more temperate locations. It includes fundamental aspects of cryospheric sciences which have applications for cold regions problems as well as engineering topics which relate to the cryosphere. Emphasis is given to applied science with broad coverage of the physical and mechanical aspects of ice (including glaciers and sea ice), snow and snow avalanches, ice-water systems, ice-bonded soils and permafrost. Relevant aspects of Earth science, materials science, offshore and river ice engineering are also of primary interest. These include icing of ships and structures as well as trafficability in cold environments. Technological advances for cold regions in research, development, and engineering practice are relevant to the journal. Theoretical papers must include a detailed discussion of the potential application of the theory to address cold regions problems. The journal serves a wide range of specialists, providing a medium for interdisciplinary communication and a convenient source of reference.