標題: Discrete element simulation of the dynamic response of a dip slope under shaking table tests
作者: Lin, Cheng-Han
Li, Hung-Hui
Weng, Meng-Chia
土木工程學系
Department of Civil Engineering
關鍵字: Dip slope;Discrete element method;Sliding mode;Shaking table test
公開日期: 4-九月-2018
摘要: A dip slope contains weak planes in the same dip direction along the slope face. In this study, a discrete element simulation was implemented to investigate the behavior of a dip slope under shaking table tests. The simulated dip slope model was first verified by testing under different horizontal excitations. Then, the influence of the slope angle and dynamic force on the deformation characteristics of the dip slopes was explored. The simulations provide detailed descriptions of the deformation processes and potential sliding mechanisms associated with the dip slopes. The results of this study are summarized as follows: (1) Two types of slope sliding, namely differential and complete, were recognized. The model with a dip angle lower than 20 degrees was more stable, and differential sliding developed gradually during external excitation. In the model with a dip angle higher than 20 degrees, the external excitation easily triggered complete sliding. (2) For threshold slope angles higher than 20 degrees, the behavior of the dip slope model changed from deformation to sliding, and the displacement within the models increased with increasing slope angle. (3) An increase in frequency led to a decrease in the trigger time for slope sliding. In addition, the slope angle was negatively correlated with the triggering time for sliding. (4) The amplification factor of peak ground displacement (PGD) increased as the slope angle increased. The amplification factors corresponding to low excitation frequencies were considerably lower than those for high excitation frequencies. In contrast to the trends for PGD, the amplification factor of peak ground acceleration (PGA) decreased as the slope angle increased.
URI: http://dx.doi.org/10.1016/j.enggeo.2018.07.005
http://hdl.handle.net/11536/148089
ISSN: 0013-7952
DOI: 10.1016/j.enggeo.2018.07.005
期刊: ENGINEERING GEOLOGY
Volume: 243
起始頁: 168
結束頁: 180
顯示於類別:期刊論文