【摘要】 在斜坡的动力响应分析中,地震动的激振方向是影响斜坡动力响应规律的主要因素之一。本文以"5·12"汶川地震灾区典型斜坡岩性及结构为模拟特征,通过对水平层状岩质斜坡开展振动台模型试验,探究地震动方向对斜坡动力响应规律的影响。以输入峰值加速度0.3 g的正弦波和天然波为例,着重对比分析斜坡模型在水平向、竖直向及合成向激振波作用下的加速度动力响应规律。研究结果表明:水平向上,在不同频率的地震动作用下,斜坡的中上部的加速度动力响应较之下部更为显著,X向地震动作用下斜坡的加速度动力响应沿高程呈较强的线性增大特征,而Z向地震动作用下斜坡的动力响应却表现出明显的非线性,且斜坡在合成向天然波作用下的响应规律表现出明显的P-Δ效应;竖直向上,Z向地震动作用下斜坡坡表和坡内的加速度响应值会随着频率的增加而不断减小,出现逐渐衰减和频散的现象。更多还原

【Abstract】 In the slope dynamic response analysis,the seismic ground motion direction is one of the main factors affecting slope dynamic responses.This article takes the lithology and structure of typical slope in"5·12"Wenchuan Earthquake-stricken area as simulation characteristics,by carrying out the shaking table model test on the horizontal layered rock slope,explores the influence of seismic ground motion direction on the slope dynamic responses.Taking sine wave and natural wave with peak acceleration 0.3 g as an example,the article focuses on the acceleration responses in vertical and horizontal directions.The results show that,the acceleration responses of the upper part is more significant than the lower part under the action of seismic ground motion with different frequencies.The slope acceleration responses along the height is increased under the action of X seismic ground motion,but seismic responses of the slope show obvious nonlinear characteristics under the action of Z ground motion.The slope acceleration responses show obvious P-Δ effect under the action of synthetic natural ground motion.In the upright direction with the frequency increasing,the acceleration responses constantly decrease and appear gradually attenuation on the surface and in the interior of the slope.更多还原