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| DYNAMIC STABILITY ANALYSIS OF SLOPE BASED ON VECTOR SUM ANALYSIS METHOD |
| (1. State Key Laboratory of Geomechanics and Geotechnical Engineering，Institute of Rock and Soil Mechanics，Chinese Academy of Sciences，Wuhan，Hubei 430071，China；2. School of Naval Architecture，Ocean and Civil Engineering，Shanghai Jiaotong University，Shanghai 200240，China) |
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Abstract Combining with the dynamic finite element method，the vector sum analysis method(VSAM) which is based on the vector characteristic of force and true stress field，is used in seismic stability analysis of slope；and the dynamic stress field at any moment under seismic loads are obtained；so the time-history curves of safety factors of slope can be obtained easily；and the whole stability state of slope can be evaluated. And then，the method is applied to a high steep rock slope；and based on the static stability analysis of slope，the deep slip surface governed by the weak discontinuities is analyzed under seismic loads. Seismic responses of 63 % and 2 % probability of overloads in 50 a are taken into account in dynamic stability analysis of the slope. The calculating results show that the dynamic safety factors are 1.86 and 1.66 under small and big seismic loads，respectively. The seismic characteristics and dynamic stability of slope can be well simulated with VSAM，so as to provide a practical approach for dynamic stability analysis of slope.
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Received: 22 October 2010
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2011, Vol. 30 
