复杂地形下的危岩落石被动防护网三维防护效果评估研究

Research on Evaluation of Protective Effect of Passive Protective Nets for Rockfall in Complex Terrain

为评估复杂地形下被动防护网的落石防护效果,利用无人机摄影测量方法,获取复杂地形的坡表形态并生成数字模型。基于RocPro3D模拟不同条件下的落石运动轨迹并评估防护网性能,对比二维与三维落石模拟结果中防护网性能的差异。计算结果表明:被动防护网缺陷的主要表现形式为防护高度不足、防护范围不足以及其他防护网缺陷引起的自身防护能力未完全发挥;被动防护系统最优防护效果表现为按照防护网布设位置,自上而下,防护网拦截率及作用在防护网上的冲击能量逐级降低;针对复杂地形下的被动防护体系评估,三维分析比二维分析的结果更加全面,更具参考价值。研究成果为被动防护网评估提供更多思路。

In order to evaluate the protective ability of passive protection nets in complex terrain,the slope surface form was obtained by using UAV(Unmanned Aerial Vehicle)photogrammetry method,and the digital model was generated.Based on RocPro3D program,the rockfall trajectories under different conditions were simulated and the performance of the protective nets was evaluated.The differences between 2D and 3D rockfall simulation results of the protective nets were compared.The results show that:the main defects of the passive protection net are insufficient protection height,insufficient protection scope,and other defects of the protection net that lead to the failure of self-protection ability.The optimal protection effect of the passive protection system is that the interception rate and impact energy acting on the protective net are gradually reduced from top to bottom according to the position of the protective nets.In terms of the evaluation of passive protection system in complex terrain,the results of 3D analysis are more comprehensive and valuable than those of 2D analysis.The research results provide a new idea for the evaluation of passive protection nets.