AN ESTIMATION METHOD FOR PERMANENT DISPLACEMENTS OF BASIC EARTHQUAKE LANDSLIDE MODEL WITH FULL CONSIDERATION OF SLID CHARACTERS FROM SHAKE TABLE TESTS
QIAN Haitao1, XIAO Ruihua2
1. Institute of Crustal Dynamics, China Earthquake Administration, Beijing 100085;
2. Consultative Centre for Geo-Hazard Prevention, Ministry of Natural Resources of People's Republic of China, Beijing 100081
To fully consider the slid characters from shake table tests, we put forward an estimation method for the permanent displacement based on the basic earthquake landslide model. (1)we calculate the yield accelerations of slide downward and upward with considering the combined control effect of seismic and gravity, in order to show the behavior that the slide-body may slide downward and upward along the slide-belt. (2)We evaluate the local acceleration close to the slid-body because of the amplification effect of vibration characteristics of slope and height of the slide-body based on a simplified dynamic model of slope. (3)We calculate the maximum velocity of slide in every seismic wave period and then give the kinetic energy dissipated by sliding along the slide-belt with considering the control role of yield accelerations and local acceleration close to the slid-body. (4)We calculate the permanent displacement in per seismic wave period through the way that divide the kinetic energy by friction force based on the fact that the energy is dissipated by frictions at the slid-belt and the principle of conservation of energy. (5)Finally we get the overall permanent displacement by accumulating the permanent displacements in every seismic wave period. Through comparing the results from experiments and calculation, we have found that the method in this paper has high accuracy and reliability in estimating the permanent displacement. The idea of this article is adoptable to the present of vertical seismic by reckoning in vertical seismic inertial force though it comes from the scene that horizontal seismic present only.
QIAN Haitao,XIAO Ruihua. AN ESTIMATION METHOD FOR PERMANENT DISPLACEMENTS OF BASIC EARTHQUAKE LANDSLIDE MODEL WITH FULL CONSIDERATION OF SLID CHARACTERS FROM SHAKE TABLE TESTS[J]. Journal of Engineering Geology, 2018, 26(6): 1585-1592.