TIME HISTORY RESPONSE ANALYSIS OF JOINTED ROCK SLOPE UNDER SEISMIC LOADS
JIANG Tong1，LIU Yuanzheng1，MA Jin2
(1. Institute of Geotechnical Engineering and Hydro-structure，North China University of Water Resources and Electric Power，Zhengzhou，Henan 450045，China；2. State Key Laboratory of Earthquake Dynamics，Institute of Geology， China Earthquake Administration，Beijing 100029，China)
Abstract：Study of the influence of seismic wave form and frequency on the time history analysis of jointed rock slope is conducted. Six different types of seismic waves are used. According to the displacement time history curves of the special monitoring points，the deformation process of jointed rock slope can be divided into three phases and two critical points. The three phases are as follows：deformation set-out phase，deformation accumulate phase and stable(unstable) phase；and the two critical points are set-out violent-slide point and deformation critical point. At the same time，edge enlarge effects of displacement are proved by the laws of dynamic response of slope. Calculation results show that the seismic wave form and frequency play important roles in the calculation. Based on this study，the limited displacement can vary about one time among four extreme cases where four different seismic acceleration sine curves are used. Sine wave of which amplitude becomes larger gradually is more reasonable to replace the actual seismic wave for the calculation. The frequency of seismic also has great effect on the deformation of slope. In fact，high frequency seismic wave controls the deformation accumulation of slope，while low frequency seismic wave controls the set-out of the slope deformation.
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2013, Vol. 32 
