1. 大连大学建筑工程学院
2. 东华理工大学土木与建筑工程学院
纸质出版:2026
移动端阅览
孙峤, 孙路平, 叶泽晖, 等. 冻融循环作用下砂岩的动态冲击特性试验研究[J]. 地质科技通报, 2026,45(1):171-184.
孙峤, 孙路平, 叶泽晖, et al. 冻融循环作用下砂岩的动态冲击特性试验研究[J]. Bulletin of Geological Science and Technology, 2026, 45(1): 171-184.
孙峤, 孙路平, 叶泽晖, 等. 冻融循环作用下砂岩的动态冲击特性试验研究[J]. 地质科技通报, 2026,45(1):171-184. DOI: 10.19509/j.cnki.dzkq.tb20240103.
孙峤, 孙路平, 叶泽晖, et al. 冻融循环作用下砂岩的动态冲击特性试验研究[J]. Bulletin of Geological Science and Technology, 2026, 45(1): 171-184. DOI: 10.19509/j.cnki.dzkq.tb20240103.
为研究冻融循环对砂岩动态力学性能和微观结构特征的影响,对冻融0
30
60
90
120次的砂岩进行了冲击速度分别为3
6
9 m/s的动态冲击压缩试验、核磁共振检测以及电镜扫描。结果表明,冻融砂岩的动态冲击破坏模式整体上为粉碎破坏,随着冻融循环次数和冲击速度的增加,砂岩的破碎程度加大,碎块尺度减小,碎块数量和粉末占比增多,分形维数增大。在相同冲击速度下,随着冻融循环次数的增加,砂岩的动态力学性能不断劣化;各动态力学性能指标均具有率相关效应。此外,建立了冻融砂岩的动态峰值应力指数衰减模型,证明了冲击速度可以在一定程度上补偿冻融循环的损伤劣化作用,使冻融砂岩衰减常数减小,半衰期延后。所建立的分形维数-动态强度演化方程,使得分形维数不仅能定量描述砂岩冲击破坏后的破碎程度,还能进一步预测其动态强度。随着冻融循环次数的增加,砂岩内部孔洞、裂隙尺寸扩大且数量增多,结构损伤程度加剧;基于上述结果,探究了冻融循环作用下砂岩的损伤破坏机制,发现砂岩的冻融损伤是多种因素共同作用的结果。该研究可为寒冷地区岩石工程提供相关参考。
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