Experimental study on dynamic response characteristics of small-spaced reinforced soil under cyclic loading

ZHAO Jianbin; BAI Xiaohong; XIE Mingxing; ZHENG Junjie

doi:10.11835/j.issn.2096-6717.2022.110

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Experimental study on dynamic response characteristics of small-spaced reinforced soil under cyclic loading

Civil Engineering | 更新时间：2023-11-21

- Experimental study on dynamic response characteristics of small-spaced reinforced soil under cyclic loading
- Journal of Civil and Environmental Engineering Vol. 45, Issue 6, Pages: 125-133(2023)
- 作者机构：
  
  1.太原理工大学土木工程学院，太原 030024
  2.华中科技大学土木与水利工程学院，武汉 430074
- 作者简介：
  
  ZHAO Jianbin (1983- ), senior engineer, main research interests: geotechnical engineering and highway subgrade, E-mail: zjbhust@hotmail.com.
  ZHENG Junjie （corresponding author）, professor, doctorial supervisor, E-mail: zhengjj@hust.edu.cn.
- 基金信息：
  
  National Natural Science Foundation of China(52008285;52178341;52078236);Technological Project of Shanxi Transportation Holdings Group Co., Ltd(18-JKKJ-23)
- DOI：10.11835/j.issn.2096-6717.2022.110
  CLC： TU431;U416.1
- Received：24 August 2022，
  
  Published：25 December 2023
- 稿件说明：
移动端阅览
赵建斌,白晓红,谢明星等.循环荷载作用下小间距加筋土动力响应特性试验研究[J].土木与环境工程学报,2023,45(06):125-133.

ZHAO Jianbin,BAI Xiaohong,XIE Mingxing,et al.Experimental study on dynamic response characteristics of small-spaced reinforced soil under cyclic loading[J].Journal of Civil and Environmental Engineering,2023,45(06):125-133.
赵建斌,白晓红,谢明星等.循环荷载作用下小间距加筋土动力响应特性试验研究[J].土木与环境工程学报,2023,45(06):125-133. DOI： 10.11835/j.issn.2096-6717.2022.110.

ZHAO Jianbin,BAI Xiaohong,XIE Mingxing,et al.Experimental study on dynamic response characteristics of small-spaced reinforced soil under cyclic loading[J].Journal of Civil and Environmental Engineering,2023,45(06):125-133. DOI： 10.11835/j.issn.2096-6717.2022.110.

摘要

基于山西省太行一号风景道K43+175处加筋土桥台工程，开展不同加筋间距工况条件下加筋砂土的动三轴试验，分析循环荷载作用下加筋间距对加筋砂土动强度、动剪切模量、阻尼比、累积塑性应变等动力响应特性的影响，探讨加筋砂土动力响应特性的演化规律，从而为加筋土柔性桥台复合结构（Geosynthetic Reinforced Soil Integrated Bridge System，GRS-IBS）工程设计中的变形预测和稳定状态评估提供依据。结果表明：随加筋层数的增加，加筋砂土动应力-动应变曲线逐渐由双曲线型过渡为直线型，试样动强度和动模量也随之增大，且加筋越密，增幅越明显；增大围压和增加加筋层数均能减小动剪应变，提升动剪切模量，减小阻尼比；增加加筋层数能有效抑制轴向累积塑性应变随循环荷载作用增长的趋势，因此，在GRS-IBS结构中应控制加筋间距，以提高加筋土的临界循环应力比，保证其处于长期动力稳定状态。

Abstract

Based on the project of GRS-IBS in Taihang No.1 Tourism Road K43+175 in Shanxi Province

a series of dynamic triaxial tests of reinforced sand with different reinforcement spacings were carried out. To provide reference for deformation prediction and condition evaluation during design process of GRS-IBS

the influence of the reinforcement spacing on the dynamic response characteristics such as dynamic strength

dynamic shear modulus

damping ratio and cumulative plastic strain were analyzed respectively. The evolution patterns of dynamic response characteristics were also discussed. The results show that the type of dynamic stress-strain curve changes from hyperbolic to linear with the increase of the number of reinforced layers

and the peak as well as dynamic strength and dynamic modulus are also improved; the denser the reinforcement

the greater the increase would be. Increasing the confining pressure or the number of reinforced layers can reduce both the dynamic shear strain and the damping ratio but increase the dynamic shear modulus. The axial plastic strain can be inhibited effectively by increasing the number of reinforcement layers under the cyclic loading

so that the reinforcement spacing in GRS-IBS structure should be controlled to raise the cyclic stress ratio and maintain the long-term dynamic stability of the reinforced soil.

关键词

Keywords

references

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