中文摘要：

一个完全的岩石失败过程通常涉及象在未经触动的岩石桥断裂形成坚持的失败表面和产生岩石块的随后的运动一样先存在洞 / 幻灯片断绝。最近发展了数字歧管方法(NMM ) 为建模有潜力如此的一个完全的失败过程。然而， NMM 承受一限制，即，意外材料领域区域变化依次发生建模。因为僵硬身体旋转没在 NMM 明确地被代表，这个问题不能容易被解决。不连续的变丑分析(DDA ) 特殊为建模被开发分离的块系统。因为僵硬身体旋转在一种明确的形式被代表，在 DDA 建模的 rotationinduced 材料区域变化能方便地被避免。在这份报纸，一种转变技术被建议并且实现了把 NMM 建模变换成 DDA 建模以便完全借助于二个方法模仿一个完全的岩石失败过程，在哪个 NMM 被采用为早从 continua 象转变一样断裂到 discontinua 建模，当 DDA 被采用当模特儿时，产生岩石的随后的运动堵住。如此的一条数字途径也作为与一条完全的 NMM 建模途径相比极大地改进模拟效率。与先存在断裂一个岩石平板位于斜坡冠和导致的大量的落石过程的非坚持的关节被模仿。到 DDA 的从 NMM 的建模转变的有效性被验证，建议数字途径的适用性被调查。

英文摘要：

A complete rock failure process usually involves opening/sliding of preexisting discontinuities as well as frac- turing in intact rock bridges to form persistent failure sur- faces and subsequent motions of the generated rock blocks. The recently developed numerical manifold method （NMM） has potential for modelling such a complete failure process. However, the NMM suffers one limitation, i.e., unexpected material domain area change occurs in rotation modelling. This problem can not be easily solved because the rigid body rotation is not represented explicitly in the NMM. The discontinuous deformation analysis （DDA） is specially de- veloped for modelling discrete block systems. The rotation- induced material area change in the DDA modelling can be avoided conveniently because the rigid body rotation is represented in an explicit form. In this paper, a transition technique is proposed and implemented to convert a NMMmodelling to a DDA modelling so as to simulate a complete rock failure process entirely by means of the two methods, in which the NMM is adopted to model the early fracturing as well as the transition from continua to discontinua, while the DDA is adopted to model the subsequent motion of the generated rock blocks. Such a numerical approach also im- proves the simulation efficiency greatly as compared with a complete NMM modelling approach. The fracturing of a rock slab with pre-existing non-persistent joints located on a slope crest and the induced rockfall process are simulated. The validity of the modelling transition from the NMM to the DDA is verified and the applicability of the proposed nu- merical approach is investigated.