Self-healing capacity of damaged rock salt with different initial damage
Self-healing capacity of damaged rock salt with different initial damage
复制标题
不同初始损伤程度的损伤岩盐自愈能力
DOI：
10.12989/gae.2018.15.1.615
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发表时间：
2018
影响因子：
3.2
通讯作者：
re
中科院分区：
文献类型：
--
作者：
Chen Jie;Kang Yanfei;Liu Wei;Fan Jinyang;Jiang Deyi;Chemenda Alex;re
为了分析外加应力和时间对盐岩裂缝愈合效果的影响，利用超声波技术对不同初始应力损伤的盐岩在自愈实验中的超声脉冲速度变化进行了监测。为改善微裂纹的闭合或再结晶创造不同的条件进行自愈实验，分析了受损盐样在恢复期约30天内的自愈效果。研究发现：受损岩盐的超声脉冲速度在恢复的前9天迅速增加，30天后逐渐增大并趋于恒定值。根据波速的变化判断损伤程度和愈合程度。在相同的恢复条件下，承受较高初始损伤应力的试件在恢复30d后仍保持较大的损伤值。有趣的是，损伤与愈合不是线性关系，而且盐裂修复能力也存在损伤阈值。当损伤程度小于阈值时，岩盐的自愈率随损伤程度的增加而增大。然而，当损伤程度超过阈值时，自愈率随损伤程度的增加而降低。
In order to analyze the healing effectiveness of rock salt cracks affected by the applied stresses and time, we used the ultrasonic technology to monitor the ultrasonic pulse velocity (UPV) variations for different initial stress-damaged rock salts during self-healing experiments. The self-healing experiments were to create different conditions to improve the microcracks closure or recrystallized, which the self-healing effect of damaged salt specimens were analyzed during the recovery period about 30 days. We found that: The ultrasonic pulse velocity of the damaged rock salts increases rapidly during the first 9 days recovery, and the values gradually increase to reach constant values after 30 days. The damaged value and the healed value were identified based on the variation of the wave velocity. The damaged values of the specimens that are subject to higher initial damage stress are still keeping in large after 30 days recovery under the same recovery condition It is interesting that the damage and the healing were not in the linear relationship, and there also existed a damage threshold for salt cracks healing ability. When the damage degree is less than the threshold, the self-healing ratio of rock salt is increased with the increase in damage degree. However, while the damage degree exceeds the threshold, the self-healing ratio is decreased with the increase in damage.