By Guowei MA, Yingxin ZHOU
This publication includes the 7 keynote papers written through the specialists, foreign popular researchers and experts and seventy three technical papers which mirror the state-of-the-practice at the research of Discontinuous Deformation: New improvement and purposes. those papers have been chosen after a rigorous evaluate method. It represents the most recent advances in numerical and analytical equipment regarding rock mechanics and engineering. Following the culture of the sequence, the most schemes of the papers are at the key block concept and its engineering functions, the discontinuous deformation research (DDA) approach and the numerical manifold strategy (NMM). besides the fact that, different appropriate issues, for instance, the distinct/discrete point technique, the meshless process, the finite aspect approach in rock mechanics and engineering functions also are incorporated. For rock plenty the place the discontinuities dominate their behaviour in a rock engineering approach comparable to rock slopes and underground rock caverns, the research of discontinuous deformation is of serious significance within the balance research and engineering layout. it really is was hoping that this booklet serves as an invaluable reference for either researchers and engineers at the new advancements and functions of some of the to be had modeling ideas and instruments during this more and more vital box of rock mechanics and engineering. subject matters lined: * Key Block thought and Engineering functions * Discontinuous Deformation research (DDA) process * Numerical Manifold approach (NMM) * Distinct/Discrete aspect technique (DEM) * software of UDEC, 3DEC and PFC codes * Meshless procedure and Rock Engineering functions * touch Algorithms * Wave Propagation via Rock Joint and Jointed Rock Mass * Deformation research of Heterogeneous fabrics * different complicated Analytical and Numerical equipment in Rock Engineering * Experimental concepts and size of Discontinuous Deformation * Case stories and different suitable subject matters
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Extra resources for Analysis of Discontinuous Deformation New Developments and Applications
The iteration number was 100. The results were shown in Fig. 5. In this figure, the trajectory obtained by the simulation were shown. This figure showed the envelope of the trajectory of Takamatsu Experiment (Fig. 1). At the first falling place immediately after the falling, as the falling rock reached the flat part in the lower side of the slope surface, the reason why the rock would not spring highly up was the effect considering the dependency of incident velocity of normal direction. Thus it may be considered that the velocity has been reproduced.
44 Analysis of Discontinuous Deformation: New Developments and Applications results. From these results, we may consider that the method of this investigation, which gives deviations to the small roughness of the topographic model and the method which gives deviation to the incident angle and the mass point analysis performed by Komura et al. and Ushiro et al. have approximately the equivalent effects of improvement on the trajectory. 5. Conclusions Concerning the rockfall experimental results performed by the former Mimistry of Construction in Takamatsu of Japan (1989), a reproducing experiment was carried out by using DDAball.
5 893# 20 893# 23 20 10 15 0 5 10 15 20 25 30 35 40 45 Time/s Figure 11. Effects of friction angle. (2) Earthquake loads It is shown that the decrease of the shear strength of the sliding surface, from stable state to unstable state in the condition of earthquake loads, was the main reason to have the Tangjiashan landslide triggered as a high speed landslide. , can be found generally in field. In order to reveal the deformation mechanism of the totally stable slopes on the condition of earthquake loads, the DDA simulation for the Tangjiashan landslide, with the condition of no parameter reducing, has been conducted while parameters of the upper limits in Table 1 are used, and the earthquake load represented by the acceleration records in Fig.
Analysis of Discontinuous Deformation New Developments and Applications by Guowei MA, Yingxin ZHOU