CAJ | 학술논문

在中高温三轴应力作用下岩石内部物理化学性质和结构特性将发生变化,随着岩石内部结构的变化会引发一系列的声发射现象.通过试验研究了大试件花岗岩在三轴压力状态下声发射随温度的变化规律.试验研究表明:①随着温度升高,岩石的声发射现象是间断发生的;②花岗岩存在一个开始发生热破裂的门槛值温度,其值为120 ℃左右;③试验温度范围内花岗岩热破裂的声发射现象可分为5个阶段,即岩石原生裂隙整合阶段、热破裂前声发射静默阶段、热破裂声发射阶段、大规模热破裂后声发射静默阶段、二次热破裂开始阶段.
재중고온삼축응력작용하암석내부물이화학성질화결구특성장발생변화,수착암석내부결구적변화회인발일계렬적성발사현상.통과시험연구료대시건화강암재삼축압력상태하성발사수온도적변화규률.시험연구표명:①수착온도승고,암석적성발사현상시간단발생적;②화강암존재일개개시발생열파렬적문함치온도,기치위120 ℃좌우;③시험온도범위내화강암열파렬적성발사현상가분위5개계단,즉암석원생렬극정합계단、열파렬전성발사정묵계단、열파렬성발사계단、대규모열파렬후성발사정묵계단、이차열파렬개시계단.
The interior physicochemical and structural properties of rock change under middle-high temperature and triaxial stress; and all these Changes would make a series of the acoustic emission phenomena. The law of the acoustic emission of granite sample under triaxial stress (axial pressure 860 kN, confining pressure 1 150 kN) with temperature is primarily studied by experiment. It is shown in this research that: ① The acoustic emission phenomena of rock discontinuously occur under the effect of temperature. ② There is the threshold for the beginning of granite thermal cracking, which is around of 120 ℃. ③ There are 5 stages for the acoustic emission phenomena of granite cracking under the effect of temperature: movement stage of the rock's original cracking; stage of the acoustic emission before the thermal cracking; the acoustic emission of thermal cracking stage; still stage of the acoustic emission after the large-scale thermal cracking; second thermal cracking stage.