基于改进拟动力法的沿河岩石边坡地震抗倾覆稳定性分析

Analysis of seismic anti overturning stability of rock slope along the river based on improved pseudo dynamic method

流水河岸岩石边坡的稳定性评价具有重要意义,文章基于改进的拟动力分析法推导了在不同工况下沿河岩石边坡地震抗倾覆稳定地震安全系数计算公式。分析了在不同岩石地震放大系数下地震力、坡顶超载、张裂缝积水深度、锚索效应以及河水侵蚀影响下岩石边坡地震抗倾覆稳定性的变化规律,分析表明,在不同工况下张裂缝积水深度、水平向地震力、河水侵蚀高度等不利于岩石边坡地震抗滑稳定性,而竖向地震力、锚索锚固力、锚固高度、边坡超载等增强岩石边坡地震抗倾覆稳定;随着岩石地震放大系数的增大,地震力对岩石边坡地震抗倾覆稳定性的不利影响增大,边坡超载、张裂缝积水深度、锚索锚固力、锚索高度、河岸水位对岩石边坡地震抗倾覆稳定性的不利影响减小,而锚索角度、坡脚侵蚀高度对边坡地震抗倾覆稳定性的不利影响基本不变。

The stability assessment of rock slopes along a riverbank is of significant importance.This paper,based on an improved pseudo-dynamic analysis method,derives earthquake safety factor calculation formulas for rock slope overturning stability under different conditions.The analysis examines the variations in rock slope overturning stability due to seismic amplification factors,toppling overload,crack water accumulation depth,anchor effects,and riverbank erosion.The results indicate that,under different geological conditions,factors such as crack water accumulation depth,horizontal seismic forces,and riverbank erosion adversely affect rock slope earthquake resistance,while factors like vertical seismic forces,anchor fixation forces,anchor heights,and slope overloading enhance rock slope overturning stability.With an increase in the rock seismic amplification factor,the adverse impact of seismic forces on rock slope overturning stability intensifies,while the adverse impact of slope overloading,crack water accumulation depth,anchor fixation forces,anchor heights,and riverbank water levels decreases,and the adverse impact of anchor angles and toe erosion heights on slope overturning stability remains relatively constant.