Study on application of Discontinuous Deformation Analysis on the Stability Analysis of Slopes

• Main Authors: Shang-Yuan Tsai, 蔡尚源
• Other Authors: Shiou Chen
• Format: Others
• Language: en_US
• Published: 2005
• Online Access: http://ndltd.ncl.edu.tw/handle/22090471647069290481

碩士 === 華梵大學 === 環境與防災設計學系碩士班 === 93 === Due to the limited plain area in Taiwan being not able to furnish the demands of vast and continuous growth in her economy, the trend to use the suburban slope area become one of the most preferable choices. But Taiwan located at the Western Pacific rim, bears the threats from both typhoon and seismic event. Besides, the insufficient control in the planning and construction, not only the view becomes manic, but also the happenings of fatal slope failure incident are occasionally reported in those areas. To avoid these incidents, it is important to analyze the stability of slope before construction or design. And, the slope stability analysis performed by the approach concerned with the limit equilibrium method is commonly adopted. While, this approach treats soil mass as continuous material that the factor of safety can be obtained by sliced method but being incapable of the calculation of post-failure prediction. Discontinuous Deformation Analysis (DDA), which is an important branch of discrete element method, is a rigorous solution with a complete scheme of block kinematics in dealing with complicated interaction between discrete blocks under ensured equilibrium conditions at any time by minimizing the total potential energy of the system. It is capable of simulating the discontinuous as well as continuous masses. From the results of this study, it is found that two shape factors should be dealt with to minimized the unreasonable movement of block on slope. There are sphericity and C/P ratio (the contact portion of perimeter) of block. For the computation of the factor of safety, DDA can obtain reasonable values when compared with the results of STABL6H if the number of slices more than 9 but not exceeding 12. Some consistent but unreasonable outcomes are obtained when the slices number more than 12. It is believed that some more modifications of DDA source codes are needed to avoid this disorder.