CAJ | 학술논문

复杂岩体含有大量的裂隙,这些裂隙尺寸及其分布形式等对弹性波传播都有很大的影响.本文加工了含单个裂隙、双裂隙和三个裂隙的玄武岩岩样单元对其进行组合,进行了25kHz、 50kHz、 400kHz、 600kHz和1000kHz 等5种频率的声波测试.通过考虑垂直或平行波传播方向的裂隙长度,来探索裂隙分布形式和不同裂隙长度对弹性波传播的影响,研究玄武岩的频散效应和波的衰减.结果表明:裂隙方向与波传播方向夹角对弹性波传播有很大的影响.当裂隙方向与波传播方向垂直时,散射效应最大;而当裂隙方向与波传播方向平行时,影响最小.上述结果可为理论模型和数值分析提供依据.
복잡암체함유대량적렬극,저사렬극척촌급기분포형식등대탄성파전파도유흔대적영향.본문가공료함단개렬극、쌍렬극화삼개렬극적현무암암양단원대기진행조합,진행료25kHz、 50kHz、 400kHz、 600kHz화1000kHz 등5충빈솔적성파측시.통과고필수직혹평행파전파방향적렬극장도,래탐색렬극분포형식화불동렬극장도대탄성파전파적영향,연구현무암적빈산효응화파적쇠감.결과표명:렬극방향여파전파방향협각대탄성파전파유흔대적영향.당렬극방향여파전파방향수직시,산사효응최대;이당렬극방향여파전파방향평행시,영향최소.상술결과가위이론모형화수치분석제공의거.
Engineering rock mass contains lots of cracks and defects, whose size and distribution form have strong influence on elastic wave propagation. In this paper, wave velocities in basalt specimens with single, two and three prefabricated cracks were measured by using five different frequencies that is 25kHz, 50kHz, 400kHz, 600kHz and 1000kHz. Taking into account the cracks vertical or parallel to the wave propagation direction, the influence of different crack lengths and different crack distributions on elastic wave propagation, the dispersion effect and wave attenuation in basalt were analyzed based on these experimental results. Results show that the included angle between crack direction and wave propagation direction has intensive effect on wave propagation: when the crack direction is vertical to the wave propagation direction, the attenuation effect is most intensive; when the crack direction is parallel to the wave propagation direction, the attenuation affect is minimum. Above results may be helpful for theoretical and numerical analysis of elastic wave propagation in basalt.