摘要
选用脆性红砂岩进行声发射单轴压缩试验,利用单一参量振铃计数得出红砂岩受力之后内部的损伤变化特征,并得出岩石损伤变量增长曲线及应力-应变曲线。两种曲线都能反映出微损伤生长、发展到裂隙生成、贯通的全过程,并将其损伤演化过程划分为4个阶段:微损伤压密阶段;微损伤生长、连接阶段;宏观损伤裂隙阶段;损伤裂隙贯通、破坏阶段。通过在损伤变量前提下得出的预测红砂岩裂纹尺度增长曲线,相比实际裂纹尺度增长曲线符合的较好。因此损伤变量完全可以对岩石内部损伤做出演化分析,同时也表明声发射信息中振铃计数参量包含着岩石内部变化的详细信息。
Brittle red sandstone was applied for uniaxial compression test by acoustic emission. The internal damagecharacteristics of the loaded sandstone were worked out by single parameter ring count, obtaining rock damagevariables growth curve and stress-strain curve. Both curves reflects the whole process from micro-damage growth tothe generation and development of fissure. The damage evolution process was divided into four stages： micro-damagecompaction; micro -damage growth and connection; macro -damage fracture; coalescence and failure of damagefracture. The growth curve of red sandstone crack growth predicted by the damage variable is better than the actualcrack growth curve. The results show that damage variables can fully analyze the evolution of rock internal damage.At the same time, the AE count parameter information contains detailed information inside the rock changes.
出处
《中国钨业》
CAS
北大核心
2017年第5期17-20,57,共5页
China Tungsten Industry
基金
国家自然科学基金项目(51464036
51564048)
