边坡地震水平峰值加速度随高程变化规律研究

Study on the Variation Law of Slope Seismic Peak Acceleration with Elevation

由于地震会造成山体滑坡等严重的灾害,边坡抗震问题一直备受国内外的关注,峰值加速度是研究地震作用下边坡稳定性的重要参数,但目前对其沿深度变化规律的研究成果较少。文章利用Abaqus有限元分析软件建立了不同工况下的边坡数值分析模型,记录不同监测路线上的水平峰值加速度,通过计算分析,确定合适每种工况的函数模型,得到变化规律的数学表达式。结果表明,总体上边坡对峰值加速度的放大系数在1~8之间,边坡的坡度变化、岩体力学参数以及地震波幅值变化会影响加速度放大系数,最大值都在45°坡度工况下。

Because earthquake can cause serious disasters such as landslides,the anti-seismic problem of slope has been paid much attention at home and abroad.The peak acceleration is an important parameter to study the stability of slope under earthquake,but there are few research results on its variation along the depth.ABAQUS finite element analysis software is used to establish the numerical analysis model of slope under different working conditions,record the horizontal peak acceleration on different monitoring routes,determine the appropriate function model for each working condition through calculation and analysis,and obtain the mathematical expression of variation law.The results show that,on the whole,the amplification factor of slope to peak acceleration is between 1 and 8,and the slope change,rock mechanics parameters and seismic amplitude value change will affect the amplification factor of acceleration,and the maximum value is 45 degree slope condition.