Analysis of Discontinuous Deformation New Developments and by Guowei MA, Yingxin ZHOU

By Guowei MA, Yingxin ZHOU

This publication includes the 7 keynote papers written by way of the specialists, foreign popular researchers and experts and seventy three technical papers which replicate the state-of-the-practice at the research of Discontinuous Deformation: New improvement and functions. those papers have been chosen after a rigorous evaluate method. It represents the newest advances in numerical and analytical tools with regards to rock mechanics and engineering. Following the culture of the sequence, the most schemes of the papers are at the key block thought and its engineering purposes, the discontinuous deformation research (DDA) procedure and the numerical manifold procedure (NMM). even if, different proper issues, for instance, the distinct/discrete point strategy, the meshless strategy, the finite point procedure in rock mechanics and engineering functions also are integrated. For rock lots the place the discontinuities dominate their behaviour in a rock engineering procedure similar to rock slopes and underground rock caverns, the research of discontinuous deformation is of serious value within the balance research and engineering layout. it truly is was hoping that this e-book serves as an invaluable reference for either researchers and engineers at the new advancements and functions of many of the on hand modeling suggestions and instruments during this more and more very important box of rock mechanics and engineering. subject matters lined: * Key Block conception and Engineering purposes * Discontinuous Deformation research (DDA) approach * Numerical Manifold strategy (NMM) * Distinct/Discrete point approach (DEM) * program of UDEC, 3DEC and PFC codes * Meshless approach and Rock Engineering functions * touch Algorithms * Wave Propagation via Rock Joint and Jointed Rock Mass * Deformation research of Heterogeneous fabrics * different complex Analytical and Numerical equipment in Rock Engineering * Experimental suggestions and size of Discontinuous Deformation * Case reviews and different appropriate issues

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Numerical simulation of startup and the whole process characteristics of Qianjiangping Landslied with DDA method [C]. Proce. of Seventh International Conference on the Analysis of Discontinuous Deformation(ICADD-7). December 10–12, 2005, Honolulu, Hawaii, 167–174. 9. Li Xiaojun, Zhou Zhenghua, Yu Haiyin, et al. Strong motion observations and recordings from the great Wenchuan Eearthquake [J]. Earthquake Engineering and Engineering Vibration, 2008, 7(3):235–246. 10. Zhou Zhaohui. 0 Wenchuan Earthquake in Sichuan Province [J].

By using these models, the analysis had been performed by applying the scale factor curve as shown in Fig. 4. In the Takamatsu Experiment, Komura or Ushiro et al. 18 (m) (Fig. 6). Figure 6. Input of height-deviation to triangle elements. 43 Analysis of Discontinuous Deformation: New Developments and Applications Figure 7. Input of height-deviation to triangle elements. The analysis results were shown in Fig. 7. In this figure, we can see that there appeared a great variation in the trajectory and velocity, when the roughness of the topographic model was taken into consideration, in comparison with the case where only the velocity ratio deviations were taken into account.

Figure 8. Cutting a slope in a jointed rock mass. 2. Modeling of block free fall In Fig. 9(a), the geometry of a single block in the 3-D space can be defined by using the explanation of physical covers and mathematical covers mentioned in the previous sections. The cube falls under the pure influence of the gravity. The acceleration of gravity is 10 m/s2 . 05 s. Figure 9(b) gives the displacement time history. 1% in the maximum absolute difference, which illustrates the accuracy of the NMM calculation.

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