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节理岩体边坡的稳定性在很大程度上取决于节理的强度及其分布形式。由于节理岩体边坡的失稳破坏具有大变形和非连续的特点,因此,离散单元法成为研究节理岩体边坡破坏机制的最有效方法之一。通过采用离散元软件PFC2D进行数值模拟,对完整岩石及节理的力学性能进行研究,并建立含密集节理的岩体边坡模型,讨论了节理连通率对边坡破坏形式的影响。结果表明,节理岩体边坡的失稳破坏是一个渐进的过程;在多组节理密集分布的岩体边坡中,连通率越大,其稳定性越差;随着连通率的减小,边坡的破坏形式由大范围的滑坡转变为局部崩塌的形式。
The stability of jointed rock slopes depends to a large extent on the strength and distribution of joints. Discontinuous element method is one of the most effective methods to study the failure mechanism of jointed rock slope due to the large deformation and discontinuity of the instability and failure of the jointed rock slope. Through the numerical simulation of discrete element software PFC2D, the mechanical properties of complete rock and joint are studied, and the rock slope model with dense joints is established. The influence of joint connectivity rate on the failure mode of slope is discussed. The results show that the failure of the jointed rock mass slope is a gradual process. In the multi-joint rock mass slope where the joints are intensively distributed, the larger the connection rate is, the worse the stability is. With the decrease of the connectivity rate, The destruction of the slope from a wide range of landslides into local collapse form.