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硅酸盐通报 ›› 2026, Vol. 45 ›› Issue (2): 712-724.DOI: 10.16552/j.cnki.issn1001-1625.2025.0773

• 道路材料 • 上一篇    下一篇

路基中粒砂岩在差速疲劳荷载作用下的变形与能量演化特征

刘高喜1(), 吴云峰2(), 刘永亮3, 刘勇2   

  1. 1.河南应用技术职业学院智能建造与设计学院,郑州 450042
    2.北京科技大学资源与安全工程学院,北京 100083
    3.河南工业大学土木工程学院,郑州 450001
  • 收稿日期:2025-08-01 修订日期:2025-10-15 出版日期:2026-02-20 发布日期:2026-03-09
  • 通信作者: 吴云峰,博士,讲师。E-mail: wyfkd412825@163.com
  • 作者简介:刘高喜(1984—),男,讲师。主要从事岩石力学方面的研究。E-mail: 15538265305@163.com
  • 基金资助:
    国家重点研发计划项目(2022YFC3004601)

Characteristics of Deformation and Energy Evolution of Roadbed Medium-Grained Sandstone under Differential Fatigue Loading

LIU Gaoxi1(), WU Yunfeng2(), LIU Yongliang3, LIU Yong2   

  1. 1. School of Intelligent Construction and Design,Henan Technical Institute,Zhengzhou 450042,China
    2. School of Resources and Safety Engineering,University of Science and Technology Beijing,Beijing 100083,China
    3. School of Civil Engineering,Henan University of Technology,Zhengzhou 450001,China
  • Received:2025-08-01 Revised:2025-10-15 Published:2026-02-20 Online:2026-03-09

摘要:

为揭示路基中粒砂岩在差速疲劳荷载作用下的力学响应机制,本文通过室内试验研究了三种加载模式(慢加快卸、等速加卸载、快加慢卸)下砂岩的变形特征与能量演化规律。试验采用MTS 322岩石力学测试系统,对试样进行分级循环加载,分析了试样的峰值应变、残余应变及能量耗散的动态变化。结果表明:不同加载模式下,砂岩应变表现稳定,残余应变与循环阶段变形差接近;慢加快卸模式峰值应变最大,快加慢卸模式峰值应变最小,残余应变初期因内部缺陷压密呈对数增长,后续随最大循环应力线性增加。输入能与弹性能随循环次数阶梯式上升,慢加快卸模式下耗散能增速显著高于其他模式;单个循环级中首个循环耗散能较高,均值耗散能与最大循环载荷呈指数关系。耗散能比随循环次数波动并逐渐收敛,其变化与材料内部损伤不均匀性及加载应力波动密切相关。研究揭示了加载速率对砂岩疲劳性能的影响机制,为道路基层材料选择与结构优化提供了理论依据。

关键词: 中粒砂岩, 差速疲劳荷载, 力学特性, 峰值应变, 残余应变, 能量耗散

Abstract:

In order to reveal the mechanical response mechanism of medium-grained sandstone under differential fatigue load, this paper studied the deformation characteristics and energy evolution law of sandstone under three loading modes (slow loading and rapid unloading, constant speed loading and unloading, rapid loading and slow unloading) through laboratory tests. The dynamic changes of peak strain, residual strain and energy dissipation of the samples were analyzed by MTS 322 rock mechanics test system. The results show that under varying loading modes, the strain exhibited by sandstone remains consistent, with the residual strain approximating the deformation discrepancy between successive cyclic stages. The peak strain is observed to be largest in the slow and fast unloading mode, and smallest in the fast and slow unloading mode. Furthermore, the residual strain exhibits a logarithmic growth at the initial stage due to the compression and density of the internal defects, and increases linearly with the maximum cyclic stress in subsequent stages. The input energy and elastic energy increase stepwise with the number of cycles, and the dissipation energy increase rate is significantly higher in the slow-plus-slow unloading mode than in the other modes. The dissipation energy of the first cycle of a single cyclic stage is elevated, and the mean dissipation energy is exponentially associated with the maximum cyclic load. The dissipated energy ratio fluctuates and converges with the number of cycles, a phenomenon that is closely related to the internal damage inhomogeneity of material damage and the fluctuation of loading stress. The present study elucidates the influence mechanism of loading rate on the fatigue performance of sandstone, thereby providing a theoretical basis for the selection of road base layer materials and structural optimization.

Key words: medium-grained sandstone, differential fatigue loading, mechanical property, peak strain, residual strain, energy dissipation

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