高速公路路堑岩质高边坡滚石防护模拟研究

Simulation Study on the Prevention of Rolling Stones on Rock High Slope at Cuttings on Expressway

以连云港某高速公路路堑岩质高边坡东坡为例,为了对高边坡滚石进行有效防护,利用Rocfall模拟了边坡滚石的运动轨迹,分析了滚石滚动过程的弹跳高度、能量变化和宽平台对滚石运动特征的影响,计算了多级平台高边坡防护网设置参数,分工况估算了防护网对各级平台边坡的滚石质量警戒值,评价了已设防护网的防护效果。结果表明:计算所得防护网设置参数与实际防护网参数基本一致,且实际所设防护网拥有更大的安全储备;宽平台的设置有利于降低滚石冲击动能和弹跳高度,反算所得各级平台边坡滚石质量警戒值可为滚石防护提供依据。

Taking the east slope of the rock high slope at cutting on an expressway in Lianyungang as an example,in order to effectively prevent the rolling stones on the high slope,Rocfall was used to simulate the movement trajectory of the rolling stones on the slope,analyze the effect of maximum vertical jump,the energy change and the wide platform on the characteristics of the rolling stone movement during the rolling,calculate the parameters of the high slope protective net of multiple platforms,estimate the stone quality warning value of protective net on slopes of each platform as per working conditions,and evaluate the effect of the protective net.The results show that the calculated setting parameters of protective net are basically the same as the actual parameters,and the latter has a larger security reserve,the setting of the wide platform is conducive to reducing the impact kinetic energy and bounce height of the Rolling Stones;the wide platform can effectively reduce the impact kinetic energy and maximum vertical jump of the rolling stones,and the warning value of the rolling stones quality on slopes at all levels of platforms can provide a basis for the protection of rolling stones.