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在济南辉长岩的三轴压缩实验(σ_3=1.3kb)中,通过显微镜观测了岩石内部微裂纹的发展.实验结果说明,在低应力状态下,微裂纹主要出现在岩石矿物结晶颗粒内部,其方向主要取决于矿物颗粒的结晶学形态.当应力达到岩石强度80%左右时,在样品中部某一对角线附近,微裂纹密度较高,出现一些穿过几个矿物颗粒的微断层.微断层的取向与外力应力场有明显的关系,一般与σ_1成40°左右的夹角.本实验还同时测量了样品弹性波的速度(V_p,V_s)和体积变化.实验表明,岩石内部微裂纹的发展以及微裂纹对岩石物理性质所产生的影响,是与晶体颗粒的尺度有关.
In the triaxial compression experiment (σ_3 = 1.3kb) of gabbro in Jinan, the development of microcracks in the rock was observed by microscopy.The experimental results show that the microcracks mainly appear in the crystalline grains of rock minerals under low stress conditions, The direction depends mainly on the crystallographic morphology of the mineral particles, and when the stress reaches about 80% of the rock strength, the microcrack density is higher near a certain diagonal in the middle of the sample with some micro-faults passing through several mineral grains. The orientation of microtach is obviously related to the external stress field, which is generally about 40 ° with σ_1.The velocity of the elastic wave (V_p, V_s) and the volume change of the sample are also measured in this experiment.The experiment shows that the internal micro-micro The development of cracks and the effects of microcracks on the physical properties of rocks are related to the size of the crystal grains.