基于Trajec 3D的硬岩人工路堑边坡滚石运动范围预测

Movement prediction of falling boulders in artificial cutting slope of hard rock based on Trajec 3D

滚石的运动范围包括横向运动距离和纵向偏移范围,是滚石防护设计工作的依据。本文基于Trajec 3D软件,以连云港某硬质岩人工路堑边坡为计算模型,通过数值模拟的方法探讨了滚石运动范围在不同滚石质量、形状以及平台铺设条件下的变化规律。结果表明:(1)对于硬质岩边坡而言潜在的不稳定岩体一旦启动即可形成滚石并构成滚石灾害,可采用数值模拟和现场试验相结合的方法研究滚石运动范围,从而针对性的设计防护网达到减少滚石灾害带来的损失;(2)文中设定的五个质量水平中,中等质量的滚石其横向威胁范围大,纵向偏移比则随着质量的增大而减小;(3)近球状滚石横向运动距离大,棱角突出的滚石纵向偏移范围大,防护设计工作应具有针对性;(4)不同平台铺设条件对滚石运动范围具有显著的影响,平台碰撞恢复系数越小滚石的运动范围越小。

The influence range of rolling stones includes the range of lateral movement and the range of longitudinal offset,which is the basis for rolling stone protection design.Based on Trajec 3 D software,this paper takes the artificial cutting slope of a hard rock in Lianyungang as the calculation model,and discusses the variation law of the influence range of the rolling stone under the quality,shape and slope condition of different rolling stones through numerical simulation.The results show that:(1)For the hard road slope,if the potential unstable rock mass starts up,it will form rolling stones and form a rolling stone disaster.The combination of active and passive protection can be adopted.(2)In the four quality levels set up in this paper,the lateral threat scope of medium quality rolling stones is large,and the longitudinal offset ratio decreases with the increase of mass;(3)The vertical movement range of the nearly spherical rolling stones is large and the longitudinal migration range of the rolling stones with a sharp angle is large,so the protection design work should be targeted;(4)Different slope conditions have a significant impact on the influence range of rolling stones,and the smaller the collision recovery coefficient of the slope is,the smaller the influence range of rolling stones will be.