地震边坡非线性特征及敏感性分析
Nonlinear Characteristics and Sensitivity Analysis of Slope under Earthquakes

使用时程分析法研究边坡动力响应的非线性特征,基于强度判据的安全系数给出地震动峰值加速度以及能量持时阀值等参数对非线性特征的影响。研究认为:对于一定的岩土材料,边坡动力响应的位移、速度、加速度呈现出明显的非线性特征,具有较强的关联性,各质点具有统一的波形形式;位移和速度变化相对地震加速度变化有明显的滞后,质点加速度相对地震加速度有明显的同步性;地震动峰值加速度以及能量持时阀值的变化均对边坡安全系数和塑性区的分布有一定的影响。
Using a time history analysis method the nonlinear characteristics of the response of slope dynamics were studied, employing criteria such as the safety factor of the soil strength, ground peak acceleration, and earthquake energy with a threshold based on the influence of these parameters on the nonlinear slope dynamics characteristics. The study results showed that for some rock and soil materials, displacement, velocity, and acceleration of the slope dynamic response which are strongly correlated show obvious nonlinear characteristics. It was found that each study particle had a unified waveform and there was a significant displacement lag and velocity variation in the relative seismic acceleration. Particle acceleration was synchronous with the seismic acceleration. The peak ground acceleration, input direction, and duration threshold variations were within the slope safety coefficient, and the distribution of plastic zone appeared to have an influence on slope safety.