基于Rockfall数值模拟的边坡落石防护网修复加固方案研究  

Study on Repair and Reinforcement Strategies for Rockfall Passive Protective Network Based on Rockfall Numerical Simulation

作　　者：陈媛[1] 刘然 罗常炜 孙涛 覃壮恩 侯争军 杨宝全[1] CHEN Yuan;LIU Ran;LUO Changwei;SUN Tao;QIN Zhuangen;HOU Zhengjun;YANG Baoquan(State Key Laboratory of Hydraulics and Mountain River Engineering,College of Water Resources and Hydropow-er,Sichuan University,Chengdu 610065,China;PowerChina Huadong Engineering Corporation Limited,Hang-zhou 311122,China;The Third Engineering Bureau Co.,Ltd.of China An′neng Construction Group,Chengdu 611130,China;Chengdu Xingjing Intelligent Technology Co.,Ltd.,Chengdu 610073,China)

机构地区：[1]四川大学山区河流保护与治理全国重点实验室水利水电学院,四川成都610065 [2]中国电建集团华东勘测设计研究院有限公司,浙江杭州311122 [3]中国安能集团第三工程局有限公司,四川成都611130 [4]成都星景智能科技有限公司,四川成都610073

出　　处：《防灾减灾工程学报》2024年第2期313-321,共9页Journal of Disaster Prevention and Mitigation Engineering

基　　金：国家自然科学基金项目(51609163);西藏自治区重点研发计划(XZ202301ZY0037G)资助。

摘　　要：某水电站尾水支洞边坡多次发生落石灾害,原被动防护网已发生局部破损,严重威胁着尾水支洞施工期和运行期的安全,需对原防护网进行修复加固。由于山体陡峭、地貌复杂,人工调查无法确定落石源,采用高精度无人机航摄初步排查出四处可疑危险源区域,利用Rockfall软件进行落石轨迹模拟计算,通过对比分析计算成果与观测到的落石落点位置与威胁区域分布情况,反分析确定了两处落石源。在此基础上,根据落石源的落石运动特征,复核分析了原防护能力不足的原因,发现原防护网的能级和高度不足是导致落石灾害发生的主要原因。通过提高防护网的能级和高度,提出了原位修复和增高加固两种方案。研究结果表明:两种方案均能有效减小落石威胁区域面积、降低落石率、改善运动特征参数。其中增高加固方案的防护效果更加显著,落石被全部拦截,落石弹跳高度和动能的最大值分别降低了69.64%、66.02%。对被动防护网破损部位的修复加固,综合考虑现场实际情况与落石模拟计算成果进行修复方案设计更为科学合理。研究成果可为该工程的落石防护方案提供科学依据,为类似工程设计与落石分析提供参考。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 a

关 键 词：落石灾害 被动防护网 落石轨迹模拟 落石源确定 修复加固效果 

分 类 号：P642.21[天文地球—工程地质学] TU943.2[天文地球—地质矿产勘探]