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采用相似材料模拟试验对不同节理倾角、节理贯通度、节理组数、荷载应变率、试件长径比、节理厚度和节理充填物等7种工况下的节理岩体在单轴压缩荷载作用下的强度及破坏模式进行了研究。结果表明:节理岩体的破坏模式及其峰值强度与节理构造形态密切相关。对于单节理岩体,其强度及破坏特征在很大程度上受节理面倾角控制,将可能产生沿节理面的剪切滑移破坏或贯穿节理面的劈裂破坏,且与第一种破坏模式相对应的岩体强度最低。对于非贯通节理岩体,其强度介于完整岩体和贯通节理岩体之间。随着平行节理组数的增加,岩体强度呈逐渐下降趋势。随着载荷应变率增加,岩体抗压强度逐渐增大,试件的破坏模式也变得更加复杂。试件长径比基本没有改变岩体的破坏模式,但随着长径比的增加,其强度逐渐增大。随着节理厚度增加,试件峰值强度逐渐降低。不同的节理填充物对试件强度也有影响。
Similar material simulations were carried out to investigate the effect of different jointed joints on the uniaxial compressive loading of rock under seven conditions including different joint inclination, joint penetration, joint group number, load strain rate, specimen aspect ratio, joint thickness and joint filling. Under the strength and failure mode were studied. The results show that the failure mode and peak strength of jointed rock mass are closely related to the joint structure. For the single jointed rock mass, the strength and failure characteristics of the rock mass are largely controlled by the inclination of the joint plane, which may result in the shear slip damage along the joint plane or the splitting failure across the joint plane, The corresponding rock strength is the lowest. For non-through jointed rock masses, the strength is between the complete rock mass and the through-jointed rock mass. As the number of parallel joints increases, the strength of rock mass decreases gradually. As the load strain rate increases, the compressive strength of rock mass gradually increases, and the failure mode of the specimen also becomes more complicated. The aspect ratio of the specimen basically did not change the failure mode of the rock mass, but the strength gradually increased as the aspect ratio increased. With the increase of joint thickness, the peak strength of specimens decreases gradually. Different joint fillers also affect the strength of the specimens.