缝合横肋式土工织物筋土界面特性数值模拟研究
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1.石家庄铁道大学土木工程学院;2.天津新亚太工程建设监理有限公司;3.中铁十九局集团第五工程有限公司;4.石家庄铁道大学交通运输学院

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TU411

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国家重点研发计划项目(2022YFE0104600)


Numerical simulation study on reinforcement-soil interface characteristics of stitched transverse rib geotextile
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College of Civil Engineering, Shijiazhuang Railway University, Shijiazhuang

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    摘要:

    筋土界面特性是加筋结构设计的基础,缝合横肋式土工织物加筋方法是对传统土工织物改良的新型加筋技术,通过立体加筋来提高筋土界面相互作用,充分发挥土工织物高强度等优势。为了研究横肋数量和高度等因素对筋土界面特性的影响,根据室内试验结果,对直剪试验进行离散元数值模拟,从宏观和细观参数上分析了不同横肋数量和高度下筋土界面的力学响应。研究结果表明:缝合横肋式土工织物可显著提高筋土界面的抗剪强度,其剪应力-位移曲线主要分为线性增长阶段和稳定阶段两部分;增加横肋数量和高度,土工织物整体抗剪强度随之增大,其中当横肋高度与土层厚度之比为0.5时,界面抗剪强度显著提高且各横肋上的应变值较为均匀,因此实际应用时建议横肋高度为加筋间距的0.5倍;随着横肋数量的增加,似黏聚力明显增加而似摩擦角变化不大,随着横肋高度的增加,似摩擦角明显增加而似黏聚力变化不大;在直剪试验过程中,土工织物平铺部分的应变和横肋上的应变随横肋数量和高度增加均增大,应变最大的位置为二者缝合处,第1道横肋应变最大并且增加最快,使该横肋缝合处成为整个体系的关键,因此实际应用时应主要关注第1道横肋的高度、设置位置以及缝合强度。本研究可为土工织物作为加筋材料的工程应用和进一步研究提供参考。

    Abstract:

    The characteristics of the reinforced soil interface form the foundation for designing reinforced structures. The method of stitching transverse rib geotextile reinforcement is an innovative technology that enhances traditional geotextiles. Three-dimensional reinforcement is employed to enhance interaction at the reinforced soil interface and fully exploit the high strength advantages of geotextiles. To investigate the influence of the number and height of transverse ribs on these characteristics, a discrete element numerical simulation was conducted based on indoor test results, enabling analysis of mechanical responses at different numbers and heights of transverse ribs from macroscopic and microscopic perspectives. The results show that the shear strength of the reinforced soil interface can be significantly improved by stitching the transverse rib geotextile. The shear stress-displacement curve is mainly divided into two parts : linear growth stage and stable stage. With the increase of the number and height of the transverse ribs, the overall shear strength of the geotextile increases. When the ratio of the height of the transverse ribs to the thickness of the soil layer is 0.5, the shear strength of the interface is significantly improved and the strain value on each transverse rib is more uniform. Therefore, it is recommended that the height of the transverse ribs is 0.5 times the reinforcement spacing in practical application. With the increase of the number of transverse ribs, the quasi-cohesive force increases obviously and the quasi-friction angle changes little. With the increase of the height of transverse ribs, the quasi-friction angle increases obviously and the quasi-cohesive force changes little. In the process of direct shear test, the strain of the paving part of the geotextile and the strain on the transverse rib increase with the increase of the number and height of the transverse ribs. The maximum strain is at the joint of the two. The strain of the first transverse rib is the largest and the fastest increase, which makes the joint of the transverse rib become the key of the whole system. Therefore, in practical application, the height, setting position and stitching strength of the first transverse rib should be mainly concerned. This study can provide a reference for the engineering application and further research of geotextiles as reinforcement materials.

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黄赛,李贺,王立朋,等. 缝合横肋式土工织物筋土界面特性数值模拟研究[J]. 科学技术与工程, , ():

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  • 收稿日期:2024-04-20
  • 最后修改日期:2024-05-29
  • 录用日期:2024-06-05
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