摘要
通过高温后花岗岩的单轴压缩及声发射试验,研究了各温度水平下试件纵波波速的变化及应力-应变曲线与声发射曲线的关联,并提出由累积声发射频数表征的损伤变量,然后依此损伤变量导出温度-应力耦合模型。研究表明:试件的纵波波速随温度的升高而降低,而且降低的幅度逐渐增大;应力-应变曲线与声发射曲线吻合得较好,主要分为六个阶段,声发射总是发生在加载曲线的转折点,意味着能量的突变;耦合模型理论曲线与试验曲线总体形状相类似,较好地反映了花岗岩的脆性。
An experimental study was performed on the acoustic emission and mechanicl characteristics of grante under different high temperatures. The variety of longitudinal wave and relationship between stress - strain curve and acoustic emission curve were analyzed. Damage variable based on accttmulative acoustic emission frequency was given, and then a new coupling model was brought out. It was shown that the velocity of longitudinal wave decreases with temperature. The stress - strain curve and acoustic emission curve have a close relationship, and acoustic emission always arose at break positions on the stress - strain curve. The theoretical and experimental stress - strain curves tallied well.
出处
《地下空间与工程学报》
CSCD
北大核心
2010年第1期70-74,共5页
Chinese Journal of Underground Space and Engineering
基金
国家重点基础研究发展规划项目(973)(2010CB226804)
关键词
岩石力学
温度
声发射
单轴压缩
本构模型
rock mechanics
temperature
acoustic emission
uniaxial compression
constitutive model
