Numerical simulation of earthquake effects on rock slope

作者：Chen XiaoLi^*; Li Yang; Hong QiYu; Zhao YongHong

来源：Acta Petrologica Sinica, 2011, 27(6): 1899-1908.

• Earthquake effect
• Landslides
• Stress distribution
• Displacement distribution

During 5. 12 Wenchuan Earthquake, there were lots of huge landslides and collapses occurred in hard rock areas. This uncommon phenomenon is beyond our knowledge. This paper discussed the different patterns of stress and displacement distributions within a perfect slope when it is subject to horizontal and vertical vibrational loads with various loading time. The analyses were performed using FEPG software. It is found that, both the stress and the displacement appear to reach their peak values when the amplitude of vibration load is 0. 1m. The maximum tensile stress at the top of a slope is bigger than around 100MPa which exceeds the anti-tensile limit of typical hard rocks such as granite, and so on. As a result, the hard rock mass breaks and landslide occurs. The study results also show that vertical vibrational loads would cause bigger stress and displacement peaks than horizontal vibrational loads. Under vertical vibrational load, maximum vertical displacement reached 0. 43m which is much bigger than the amplitude of the original load. Consequently vertical vibration might become the main factor that causes slope failures. Moreover, longer loading time will cause more serious deformation and damage.

• 出版日期2011-6
• 单位北京大学; 中国地震局