Study on Repair and Reinforcement Strategies for Rockfall Passive Protective Network Based on Rockfall Numerical Simulation
Rockfall disasters frequently occur in the tailrace branch tunnel slope of a hydropower sta-tion,leading to partial damage to the original passive protection network and posing severe risk to the safety of the tunnel exit area during the construction and operation period.It is very urgent and neces-sary to repair and reinforce the original passive protection network.Given the steep and complex land-form,the rockfall sources could not be identified through manual survey.Therefore,high-precision UAV aerial imagery was utilized to preliminarily identify four potential hazard areas.Rockfall software was used for trajectory simulation calculations.By comparing and analyzing the simulated results with the observed rockfall landing positions and the distribution of the threatened areas,two rockfall sourc-es were identified through inverse analysis.Based on this,by analyzing the movement characteristics of these sources,a review was conducted on the reasons behind the insufficient original protection ca-pacity.It was discovered that the primary causes for rockfall disasters were the low energy level and in-adequate height of the existing protection network.Two schemes were proposed to enhance the net-work's energy level and height:in-situ repair and heightening reinforcement.The analysis results indi-cated that both schemes could effectively reduce the area threatened by rockfalls,lower the rockfall oc-currence rate,and improve movement characteristic parameters.Among them,the heightening rein-forcement scheme had a more significant protection effect,with all rockfalls being intercepted.The maximum values of rockfall's kinetic energy and bouncing height were reduced by 66.02%and 69.64%,respectively.The scheme of in-situ repair and reinforcement of the network's damaged sec-tions would be more logical and scientific when the actual site conditions and rockfall simulation results were taken into consideration.The research results provide a scientific basis for rockfall protection mea-sures of this project and serve as a reference for similar rockfall analysis and engineering design.
国家科技期刊平台
NSTL
万方数据
维普
