【摘要】 针对非贯通节理岩体研究中多以共面节理岩体为对象、对异面节理岩体力学性质研究较少的问题,为了更全面的研究非贯通节理岩体的贯通扩展规律,基于直剪模型试验及相关颗粒流理论,利用颗粒离散元数值模拟软件PFC^2D,研究不同工况的非贯通异面节理岩体。对比异面节理起伏角度、节理倾斜角度（节理与水平剪切方向的夹角）、节理连通率以及试验加载速率和法向应力对异面非贯通节理岩体扩展贯通机理和强度特性的影响。试验结果显示以上五方面对非贯通节理岩体的力学特性影响显著:（1）异面节理的起伏角度越大,非贯通节理岩体的峰值抗剪强度越大,抗剪能力越强。岩体的峰值剪切位移随着节理起伏角度的增大有增大的趋势。（2）非贯通节理岩体的峰值剪切强度、峰值剪切位移会随着试验剪切速率的增大逐渐增大,但增大的速率和幅度会随剪切速率的增大而变小。（3）非贯通节理岩体的峰值抗剪强度会随着法向应力的增大逐渐增大,且增大趋势呈线性。（4）异面节理的连通率越大,非贯通节理岩体的抗剪能力越差,峰值抗剪强度越小。峰值剪切位移亦随连通率的增大而减小,但减小幅度不大。（5）节理的倾角越大,岩体峰值切应力越大,抗剪能力越强。更多还原

【Abstract】 Natural rock masses exist in the form of different-faced jointed rock masses. In the past studies of Non-persistent joints rock masses, no matter whether it is a physical model or a numerical model, persistent joints rock mass is often treated as the research object. In order to more comprehensively study the penetrative extension law of the rock mass with non-penetrative joints, the rock mass with non-consecutive heterogeneous joints under various working conditions are studied herein with the particle discrete element numerical simulation software PFC^{2 D} in accordance with the direct shear test and the relevant particle flow theory; in which the influences from the undulation angle, the inclination angle（the inclined angle between joint and horizontal shear direction）, joint connectivity rate as well as the test loading rate and normal stress on the extension and penetration mechanism and the strength characteristics of the rock mass with non-penetrative joints. The test result shows that the influences from the aspects mentioned above on the mechanical properties of the rock mass with non-penetrative joints are significant:（1） The larger the undulation angle of the heterogeneous joint is, the higher the peak shearing strength of the rock mass with non-penetrative joints is to be, while the stronger the shearing capacity is to be as well. The peak shearing displacement of the rock mass has an increasing trend along with the increase of the undulation angle.（2） The peak shearing strength and the peak shearing displacement of the rock mass with non-penetrative joints are to be gradually increased along with the increase of the test shearing rate, but the increased rate and amplitude are to become smaller along with the increase of the shearing rate.（3） The peak shearing strength of the rock mass with non-penetrative joints is to be gradually increased along with the increase of the normal stress.（4） The larger the connectivity rate of the heterogeneous joint is, the poorer the shearing capacity of the rock mass with non-penetrative joints is to be, while the smaller the peak shearing capacity is to be as well. The peak shearing displacement is also decreased along with the increase of the connectivity rate and the increase exhibits a linear trend.（5） The larger the inclined angle of joint is, the greater the peak shearing stress of the rock mass is to be, while the stronger the shearing capacity is to be as well.更多还原