【摘要】：聲波波速變化可有效表征巖體損傷程度。通過(guò)對(duì)巖樣進(jìn)行人工預(yù)損,利用聲波檢測(cè)標(biāo)定巖樣的不同損傷程度,然后通過(guò)三軸壓縮試驗(yàn)來(lái)研究不同損傷程度下巖石的力學(xué)特性,建立了聲波速度下降幅度與巖體力學(xué)參數(shù)變化幅度間的關(guān)系。研究表明,當(dāng)巖樣的聲波速度下降5%~8%時(shí),黏聚力c值降低15%~25%,內(nèi)摩擦角?值則升高14%~32%,因此,用聲波速度的下降幅度來(lái)描述巖體參數(shù)的變化是可行的。根據(jù)現(xiàn)場(chǎng)實(shí)測(cè)的巖體損傷區(qū)內(nèi)的聲波速度的變化值,可以從一定程度上估計(jì)巖體參數(shù)的跌落情況,從而更進(jìn)一步地說(shuō)明損傷區(qū)內(nèi)巖體的承載力。
[Abstract]:The change of acoustic wave velocity can effectively characterize the damage degree of rock mass. Through artificial predamage of rock samples, acoustic wave detection is used to calibrate different damage degrees of rock samples, and then triaxial compression tests are used to study the mechanical properties of rock under different damage degrees. The relationship between the decreasing amplitude of acoustic velocity and the variation of mechanical parameters of rock mass is established. The results show that when the acoustic velocity of the rock sample decreases by 5% 鈮，

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