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为研究节理间距和节理倾角对岩体破碎特征的影响,对单轴压缩实验后的岩体模拟试件进行了筛分实验。将破碎体按粒径分为粗粒、中粒、细粒和微粒4个粒级,统计和计算了各粒级的质量百分比和频数、比表面积和尺度-质量分布的分形维数。结果表明:1)在节理间距不变时,中粒、细粒和微粒的质量百分比、各粒径的频数、比表面积和分形维数随节理倾角的变化曲线都呈V型,在节理倾角为45°处有最小值,而粗粒质量百分比的变化规律则相反,呈反V型;2)在节理倾角不变时,随着节理间距的减小(节理化系数的增加),中粒、细粒和微粒的质量百分比、各粒径的频数、比表面积和分形维数都增大,而粗粒质量百分比则减小;3)在单轴压缩下,节理密度的增加使得岩体的破碎程度提高、能量耗散增多,这与节理间距和倾角组合变化下试件的劈裂、压碎和剪切滑移破坏模式密切相关。
In order to study the effect of joint spacing and joint inclination on the rock mass crushing characteristics, the rock mass simulation specimen after uniaxial compression experiment was screened. The crushed body was divided into four fractions of coarse grain, medium grain, fine grain and fine grain according to grain size. The mass percentage and frequency, specific surface area and scale - the fractal dimension of mass distribution were calculated and calculated. The results show that: 1) When the joint spacing is constant, the mass percentage of medium particles, fine particles and fine particles, the frequency of each particle size, the specific surface area and the fractal dimension change with the inclination of the joint are V-shaped, 45 ° at the minimum value, while the change of the percentage of coarse particles in the opposite, was anti-V-shaped; 2) in the same inclination, with the reduction of joint spacing (joint coefficient of increase) The mass percentage of fine particles and fine particles, the frequency of each particle size, the specific surface area and the fractal dimension increase, while the mass percentage of coarse particles decreases; 3) Under the uniaxial compression, the increase of joint density makes the rock mass broken The degree of energy dissipation increases, which is closely related to the splitting, crushing and shear-slip failure modes of the specimens under the joint spacing and inclination changes.