【摘要】 边坡矢量和方法是基于力的矢量特性和边坡体真实应力场的分析方法,动力有限元法可模拟得到边坡体在天然地震动荷载作用下每一时刻的应力状态,在此基础上采用边坡矢量和法进行动力稳定性分析,可得到边坡体在地震动过程中的安全系数时程曲线,进而对其动力稳定性进行评价。针对一高陡边坡,在静力稳定性分析的基础上,针对软弱结构面控制的深层滑移面采用矢量和法进行动力稳定性分析,计算中考虑小震(50 a超越概率63%)和大震(50 a超越概率2%)作用下的动力响应。计算结果表明,在小震和大震作用下的动力安全系数分别为1.86,1.66。矢量和法能够较真实地模拟边坡在地震动过程中的动力特征和稳定性状态,为边坡动力稳定性分析提供一种切实可行的分析途径。更多还原

【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.更多还原