东北大学学报(自然科学版) ›› 2024, Vol. 45 ›› Issue (1): 111-119.DOI: 10.12068/j.issn.1005-3026.2024.01.014
贾蓬, 毛松泽, 钱一锦, 卢佳亮
收稿日期:
2022-08-31
出版日期:
2024-01-15
发布日期:
2024-04-02
作者简介:
贾 蓬(1973-),女,内蒙古呼和浩特人,东北大学教授,博士生导师.
基金资助:
Peng JIA, Song-ze MAO, Yi-jin QIAN, Jia-liang LU
Received:
2022-08-31
Online:
2024-01-15
Published:
2024-04-02
摘要:
为研究加载速率和冻融循环对砂岩动态劈裂特性的影响,对冻融0,25,50,75,100次的砂岩进行了静态和不同加载速率的动态劈裂试验,分析了冻融砂岩的静动态抗拉强度及冲击荷载作用下耗散能变化规律.研究结果表明:冻融砂岩的静动态抗拉强度、纵波波速、质量损失率均随冻融次数增加而劣化.随冻融次数、加载速率增加,动强度增加因子(DIF)不断增大,且砂岩冻融损伤越大,DIF随加载速率增加越明显.建立的基于冻融损伤和加载速率的动态抗拉强度预测模型可以很好地反映砂岩的强度变化.砂岩的冻融损伤越大,动态抗拉强度随加载速率的变化速率越快;冲击荷载作用下的耗散能随冻融次数增加而减小,随加载速率增加而增大.
中图分类号:
贾蓬, 毛松泽, 钱一锦, 卢佳亮. 不同加载速率下冻融砂岩的动态劈裂特性[J]. 东北大学学报(自然科学版), 2024, 45(1): 111-119.
Peng JIA, Song-ze MAO, Yi-jin QIAN, Jia-liang LU. Dynamic Splitting Characteristics of Freeze-Thawed Sandstone at Different Loading Rates[J]. Journal of Northeastern University(Natural Science), 2024, 45(1): 111-119.
冻融 次数 | 冻融损伤 因子 | 拟合度 | ||
---|---|---|---|---|
0 | 0 | 0.019 | 0.37 | 0.91 |
25 | 0.13 | 0.011 | 0.41 | 0.89 |
50 | 0.21 | 0.007 | 0.45 | 0.95 |
75 | 0.33 | 1.64×10-4 | 0.78 | 0.99 |
100 | 0.40 | 5.89×10-5 | 0.86 | 0.92 |
表1 经验方程拟合参数
Table 1 Fitting parameters of empirical equation
冻融 次数 | 冻融损伤 因子 | 拟合度 | ||
---|---|---|---|---|
0 | 0 | 0.019 | 0.37 | 0.91 |
25 | 0.13 | 0.011 | 0.41 | 0.89 |
50 | 0.21 | 0.007 | 0.45 | 0.95 |
75 | 0.33 | 1.64×10-4 | 0.78 | 0.99 |
100 | 0.40 | 5.89×10-5 | 0.86 | 0.92 |
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