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在详细地质调查的基础上,构建比较贴近边坡实际岩体结构特征的数值模拟模型,运非连续变形数值分析方法,对雅沪高速公路西冲特大桥16#桥墩旁的危岩体陡峻斜坡在地震动力作用下的变形模式、破坏规模及程度进行了模拟预测,对边坡的破坏特征有了初步较为系统的认识,变形破坏演进过程及特征主要表现为:坡顶岩体震裂松弛小幅抛射;中部岩体拉裂溃滑解体;失稳碎裂岩块经振动堆积稳定在坡脚。在坡体及桥墩重要位置布设了监测点,并对各监测点的位移大小和变化特征进行了分析和统计,结果表明桥墩上各监测点位移呈现波动变化特证,桥墩顶端波动明显;系梁处由于失稳岩块的撞击及堆积体的影响导致变形及永久位移较墩身其他位置大;对坡体及桥墩的变形程度用位移数据大小进行量化;并根据变形程度提出了防治方案和具体措施。
On the basis of detailed geological survey, a numerical simulation model is established which is close to the actual rock mass structural features of slope, and the non-continuous deformation numerical analysis method is used to analyze the steep slope of the dangerous rock mass beside 16 # pier of Xichong Bridge on Yahu Expressway The deformation mode, the scale and extent of the damage under earthquake action are simulated and predicted, and the damage characteristics of the slope are preliminarily systematically recognized. The evolution process and characteristics of deformation and failure are mainly as follows: Projectile; central rock pull crack collapse body; destabilized fracture rock block accumulation by the vibration at the foot of the slope. The monitoring points are laid at the important positions of the slope and piers, and the displacement and variation characteristics of each monitoring point are analyzed and statistically analyzed. The results show that the displacements of the monitoring points on the piers show the characteristics of fluctuating changes and the top of the pier fluctuates obviously. The deformation and permanent displacement are larger than other positions of the pier because of the impact of the unstable rock mass and the impact of the pile body. The deformation degree of the slope body and bridge piers is quantified by the size of the displacement data. According to the deformation degree, the control scheme and the concrete Measures.