摘要
应用超声波混凝土测试仪(TICO),系统研究了含水率、裂纹、应力和温度对花岗岩内波速传播的影响.实验发现含水率对波速影响比较大,饱和岩样的声波传播速度高于不饱和岩样的声波传播速度;人工预制裂纹对声波传播速度影响不大;单轴压缩条件下,声波传播速度随应变增加逐渐降低;在同一温度(160℃)下,波速随保温时间的增加而逐渐降低;在对岩样逐渐加热情况下,初始加热阶段波速略有升高,当温度达到60℃时,岩样波速达到峰值,之后随着温度继续升高其波速逐渐下降;波速随温度变化具有一定的尺寸效应.实验结果表明,声波在岩石内传播速度受很多外在因素影响,并具有一定的传播规律.
The effects of water ratio, crack, strain and temperature on the acoustic wave velocity in granite samples were investigated systematically by means of TICK）, an ultrasonic concrete tester. The following results were found, i.e. , the water ratio affects obviously the acoustic wave velocity of rock sample; the wave velocity is higher in saturated rock samples than in unsaturated ones; and it decreases gradually with the strain of samples during uniaxial compression; and also with the lengthening holding time at 160℃ ; when heating the samples the acoustic wave velocity increases slightly in initial stage and comes to the peak value at 60℃ then decreases gradually with increasing temperature; meantime, there is a certain temperature effect on rock samples size. All these indicate that the acoustic wave velocity in granite samples is affected by several extrinsic factors and some rules may be found.
出处
《东北大学学报（自然科学版）》
EI
CAS
CSCD
北大核心
2006年第9期1030-1033,共4页
Journal of Northeastern University(Natural Science)
基金
国家自然科学基金资助项目(504740175017401350574022)
关键词
花岗岩
波速
应力应变
超声波
混凝土测试仪
granite
wave veloeity
stress-strain
ultrasonic wave
TICO（testing instrument ot concrete）
