花岗岩单轴压缩的声发射特征及热力耦合模型  

Acoustic Emission Characteristics and Thermodynamic Coupling Model of Granite under Uniaxial Compression

作　　者：张志镇[1,2] 高峰[1,2] 徐小丽[3] 

机构地区：[1]中国矿业大学深部岩土力学与地下工程国家重点实验室,江苏徐州221008 [2]中国矿业大学建筑工程学院,江苏徐州221116 [3]南通大学建筑工程学院,江苏南通226019

出　　处：《地下空间与工程学报》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)

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.

关 键 词：岩石力学 温度 声发射 单轴压缩 本构模型 

分 类 号：TU452[建筑科学—岩土工程]