基于声发射的岩石损伤演化特征分析

发布时间：2018-04-03 13:47

本文选题：岩石微损伤　切入点：损伤演化　出处：《中国钨业》2017年05期

【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。
[Abstract]:The brittle red sandstone was selected for acoustic emission uniaxial compression test. The damage characteristics of red sandstone were obtained by single parameter ringing counting, and the damage variable growth curve and stress-strain curve of rock were obtained.The two curves can reflect the growth of micro-damage and develop to the whole process of crack formation and penetration, and the damage evolution process can be divided into four stages: micro-damage compaction stage, micro-damage growth stage, connection stage, macro-damage fracture stage;Damage crack through, failure stage.The predicted crack scale growth curve of red sandstone is better than that of actual crack growth curve under the premise of damage variable.Therefore the damage variables can be used to analyze the evolution of the damage inside the rock and it is also shown that the ringing counting parameter in the acoustic emission information contains the detailed information of the variation of the rock interior.
【作者单位】：内蒙古科技大学矿业研究院;
【基金】：国家自然科学基金项目(51464036;51564048)
【分类号】：TU45

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