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利用岩石双轴流变试验仪,对大理岩圆球颗粒进行粒间切向接触试验,通过对试验结果的分析,揭示大理岩颗粒之间的切向接触特性。结果表明:法向力对大理岩切向破坏力的影响存在临界值,小于该临界值时,随着法向力的增大切向破坏力的增速较快;大于该临界值时,随着法向力的增大切向破坏力的增速较慢。表面摩擦系数对大理岩切向破坏力的影响与法向力大小有很大关系。当法向力较小时,表面摩擦系数会显著提高大理岩的切向破坏力,随着法向力的增大,这种影响逐渐减弱,当法向力达到法向破坏力的45%后,这种影响基本没有。球形大理岩直径越大,其切向破坏力和切向破坏位移也越大,切向刚度越小。大直径的球形大理岩所得到的试验曲线波动较大。
Using the rock biaxial rheological tester, the intergranular tangential contact test of marble spherical particles was carried out. The analysis of the test results revealed the tangential contact characteristics of the marble particles. The results show that there is a critical value of the normal force on the marble tangential destructive force. When the critical force is smaller than the critical value, the tangential destructive force increases rapidly with the increase of the normal force. Increase the force tangential destructive growth slowed down. The influence of surface friction coefficient on marble tangential destructive force has a great relationship with the magnitude of normal force. When the normal force is small, the surface friction coefficient will significantly increase the tangential destructive force of marble. With the increase of normal force, this effect will gradually weaken. When the normal force reaches 45% of the normal destructive force, This effect is basically no. The larger the diameter of spherical marble, the more its tangential destructive force and tangential damage displacement, the smaller the tangential stiffness. Large diameter spherical marble obtained the test curve fluctuations.