硅酸盐通报 ›› 2026, Vol. 45 ›› Issue (2): 712-724.DOI: 10.16552/j.cnki.issn1001-1625.2025.0773
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:
LIU Gaoxi1(
), WU Yunfeng2(
), LIU Yongliang3, LIU Yong2
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。
中图分类号:
刘高喜, 吴云峰, 刘永亮, 刘勇. 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[J]. 硅酸盐通报, 2026, 45(2): 712-724.
LIU Gaoxi, WU Yunfeng, LIU Yongliang, LIU Yong. Characteristics of Deformation and Energy Evolution of Roadbed Medium-Grained Sandstone under Differential Fatigue Loading[J]. BULLETIN OF THE CHINESE CERAMIC SOCIETY, 2026, 45(2): 712-724.
| Loading mode | Loading time t1/s | Unloading time t2/s | Sample No. | Total duration of a single cycle/s | Loadfrequency/Hz |
|---|---|---|---|---|---|
| Mode 1: slow loading and rapid unloading | 4.0 | 1.0 | S1, S2 | 5 | 0.2 |
| Mode 2: constant speed loading and unloading | 2.5 | 2.5 | S3, S4 | 5 | 0.2 |
| Mode 3: rapid loading and slow unloading | 1.0 | 4.0 | S5, S6 | 5 | 0.2 |
表1 三种加载模式说明
Table 1 Explanation of three loading modes
| Loading mode | Loading time t1/s | Unloading time t2/s | Sample No. | Total duration of a single cycle/s | Loadfrequency/Hz |
|---|---|---|---|---|---|
| Mode 1: slow loading and rapid unloading | 4.0 | 1.0 | S1, S2 | 5 | 0.2 |
| Mode 2: constant speed loading and unloading | 2.5 | 2.5 | S3, S4 | 5 | 0.2 |
| Mode 3: rapid loading and slow unloading | 1.0 | 4.0 | S5, S6 | 5 | 0.2 |
| Sample No. | Diameter/mm | Height/mm | Mass/g | Density/(g·cm-3) | Longitudinal wave velocity/(m·s-1) | Breaking strength/MPa |
|---|---|---|---|---|---|---|
| S1 | 49.75 | 100.30 | 503.3 | 2.58 | 4 238 | 67.9 |
| S2 | 50.01 | 100.50 | 522.1 | 2.64 | 4 387 | 142.8 |
| S3 | 50.10 | 100.25 | 520.0 | 2.63 | 4 066 | 108.6 |
| S4 | 50.20 | 99.60 | 517.5 | 2.63 | 4 099 | 87.7 |
| S5 | 50.05 | 99.55 | 516.7 | 2.64 | 4 547 | 148.6 |
| S6 | 50.05 | 100.75 | 524.7 | 2.65 | 4 167 | 123.5 |
表2 试样的物理参数
Table 2 Physical parameters of samples
| Sample No. | Diameter/mm | Height/mm | Mass/g | Density/(g·cm-3) | Longitudinal wave velocity/(m·s-1) | Breaking strength/MPa |
|---|---|---|---|---|---|---|
| S1 | 49.75 | 100.30 | 503.3 | 2.58 | 4 238 | 67.9 |
| S2 | 50.01 | 100.50 | 522.1 | 2.64 | 4 387 | 142.8 |
| S3 | 50.10 | 100.25 | 520.0 | 2.63 | 4 066 | 108.6 |
| S4 | 50.20 | 99.60 | 517.5 | 2.63 | 4 099 | 87.7 |
| S5 | 50.05 | 99.55 | 516.7 | 2.64 | 4 547 | 148.6 |
| S6 | 50.05 | 100.75 | 524.7 | 2.65 | 4 167 | 123.5 |
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