SIMPLIFIED METHOD FOR DETERMING SEISMIC SAFETY FACTOR OF ROCK SLOPE
LIU Hongshuai1，BO Jingshan1，2，YANG Junbo3
(1. Key Laboratory of Earthquake Engineering and Engineering Vibration，Institute of Engineering Mechanics，China Earthquake Administration，Harbin，Heilongjiang 150080，China；2. Institute of Disaster Prevention，Sanhe，Hebei 065201，China；
3. Central Southern China Electric Power Design Institute of China Power Engineering Consulting Group Corporation，Wuhan，Hubei 430071，China)
Abstract：The pseudo-static method for the seismic stability evaluation of rock slope is recommended by most codes at home and abroad，but it neglects the effects of dynamic properties of rock mass and most of earthquake ground motion characters. Furthermore，the method of earthquake time-history reasonably considering the effects of main factors is time-consuming and laborious. Nowadays，such simplified methods are lacking in the seismic stability evaluation of rock slope，which can reasonably consider the impacts of dynamic properties of rock mass and the characters of earthquake ground motion. Thus，the relation between the seismic and pseudo-static safety factors is constructed and two simplified methods，which can comprehensively utilize respective advantages of the time-history method and pseudo-static method for determining the seismic safety factor of rock slope，are put forward as follows：(1) The statistical models of seismic safety factor of rock slope and pseudo-static safety factor，peak acceleration are provided for the critical slopes. (2) The rectified coefficients of seismic safety factor of rock slope and pseudo-static safety factor are derived，and corresponding correction schemes are suggested for general slopes. The execution procedures of the simplified methods are illustrated using the method combining finite elements with limit equilibrium method through a typical rock slope. The results prove the feasibility and rationality of the suggested methods. The simplified methods proposed provide the valuable methods and the important reference for rapid evaluation aftershock of critical slopes and seismic stability evaluation of general slopes.
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2012, Vol. 31 
