Dynamic deformation characteristics and microanalysis of aeolian sand subgrade fill materials

LUO Wenxiao; XIA Yuanyou; LIU Zhanbing; WANG Jinyuan; YIN Yuan

doi:10.11835/j.issn.2096-6717.2026.029

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Dynamic deformation characteristics and microanalysis of aeolian sand subgrade fill materials

更新时间：2026-05-06

- Dynamic deformation characteristics and microanalysis of aeolian sand subgrade fill materials
- Journal of Civil and Environmental Engineering Pages: 1-11(2026)
- 作者机构：
  
  1.武汉理工大学土木工程与建筑学院，武汉 430070
  2.湖北市政建设集团有限公司，武汉 430063
  3.湖北省路桥集团有限公司，武汉 430056
- 作者简介：
  
  LUO Wenxiao (2000- ), main research interest: application of wind-blown sand roadbed fillers, E-mail: 1165182297@qq.com.
  XIA Yuanyou ， professor， doctoral supervisor， E-mail： xiayy1965@whut.edu.cn.
- 基金信息：
  
  Scientific Research Project of Hubei Provincial Road and Bridge Group Co., Ltd(A06JS-XZ-2024-001/0)
- DOI：10.11835/j.issn.2096-6717.2026.029
  CLC： U416.1
- Received：10 December 2025，
  
  Online First：06 May 2026，
- 稿件说明：
移动端阅览
骆闻骁,夏元友,刘占兵等.风积沙路基填料的动力变形特性及细观分析[J].土木与环境工程学报,

LUO Wenxiao,XIA Yuanyou,LIU Zhanbing,et al.Dynamic deformation characteristics and microanalysis of aeolian sand subgrade fill materials[J].Journal of Civil and Environmental Engineering,
骆闻骁,夏元友,刘占兵等.风积沙路基填料的动力变形特性及细观分析[J].土木与环境工程学报, DOI：10.11835/j.issn.2096-6717.2026.029.

LUO Wenxiao,XIA Yuanyou,LIU Zhanbing,et al.Dynamic deformation characteristics and microanalysis of aeolian sand subgrade fill materials[J].Journal of Civil and Environmental Engineering, DOI：10.11835/j.issn.2096-6717.2026.029.

摘要

开发和合理利用风积沙作为路基材料对沙漠地区交通工程建设具有重要意义。现有研究多集中于风积沙路基填料的宏观变形现象描述，缺乏对风积沙这种特殊不良级配材料“动力失稳临界状态”的定量判别标准，且其在动载作用下的宏观变形机制尚不明确。通过室内动三轴试验结合PFC

离散元模拟，基于累积塑性应变速率演化规律，提出了适用于风积沙路基填料的基于

值的动力稳定性临界判据；从力链网络演化角度，探明了风积沙在不同变形模式（稳定型、临界型、破坏型）下的细观结构响应机制。结果表明：围压与动应力幅值分别通过侧向约束强化和荷载增量效应调控风积沙路基塑性变形，其中低围压下动应力诱发颗粒结构失稳，高动应力直接导致变形加剧。基于累积塑性应变速率随循环加载次数变化的拟合曲线建立的参数

值判定准则能准确识别风积沙路基填料塑性变形行为的类型（破坏型/稳定型/临界型）。3种类型塑性变形行为的力链场演化过程在细观上存在差异：破坏型工况因轴向强力链密集集中导致迅速变形；稳定型工况通过均匀分布的强弱力链形成稳定传力路径，提高了抗变形能力；临界型工况存在强力链断裂弱化现象，力链体系未达平衡，仍有破坏风险。

Abstract

The development and rational utilization of aeolian sand as subgrade material is of great significance for the construction of transportation projects in desert areas. Existing research mainly focuses on the description of macroscopic deformation phenomena of aeolian sand subgrade fillers

lacking quantitative criteria for the "dynamic instability critical state" of this special poorly-graded material

and the macroscopic deformation mechanism under dynamic loading is still unclear. Through indoor dynamic triaxial tests combined with PFC

discrete element simulation

based on the evolution law of cumulative plastic strain rate

a dynamic stability critical criterion based on the b value for aeolian sand subgrade fillers was proposed; from the perspective of force chain network evolution

the microstructure response mechanism of aeolian sand under different deformation modes (stable type

critical type

and failure type) was clarified. The results show that confining pressure and dynamic stress amplitude respectively regulate the plastic deformation of aeolian sand subgrade through lateral constraint strengthening and load increment effect

among which low confining pressure causes particle structure instability under dynamic stress

and high dynamic stress directly leads to aggrav

ated deformation. The parameter b value determination criterion established based on the fitting curve of cumulative plastic strain rate with the number of loading cycles can accurately identify the type of plastic deformation behavior of aeolian sand subgrade fillers (failure type/stable type/critical type). The evolution process of the force chain field of the three types of plastic deformation behaviors shows differences at the microscale: in the failure type condition

the dense concentration of axial strong force chains leads to rapid deformation; in the stable type condition

stable force transmission paths are formed through uniformly distributed strong and weak force chains

enhancing the anti-deformation ability; in the critical type condition

there is a phenomenon of strong force chain fracture and weakening

and the force chain system is not in equilibrium

still posing a risk of failure.

关键词

Keywords

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