摘要
贵州省位于我国西南地区,多山地丘陵,是典型的喀斯特地形地貌区,崩塌、滑坡等地质灾害频发。思南县小屯岩崩塌带上现存危岩体方量大,裂隙、凹岩腔、溶蚀孔洞等发育。为研究岩溶典型区崩塌落石被动防护网失效概率,通过高精度实景建模技术,构建崩塌带三维模型,进行崩塌落石运动过程模拟,根据现场调查、无人机航拍和数值模拟结果,选择合适的位置布设落石被动防护网。基于落石粒径大小识别,选取不同粒径大小的落石,进行落石被动防护网拦截效果模拟,计算落石被动防护网失效概率。结果表明:13种粒径落石突破概率各不相同,(0.25,2.25)m粒径落石拦截效果良好,但落石被动防护网拦截率不能达到百分之百;落石粒径大于2.25 m,被动防护网出现失效现象,故将2.25 m粒径的落石为小屯岩崩塌带下被动防护网的设计上限。根据计算,所有粒径落石经被动防护网拦截后的失效概率低于5%,属可接受范畴。研究成果为小屯岩崩塌带的落石防护措施提供了有力的参考依据,对保护岩溶地区山区人民的生命安全和财产安全具有重要意义。
Guizhou Province is located in Southwest of China,with many mountains and hills,and is a typical karst topography and geomorphology area with frequent geological disasters such as collapses and landslides.The existing dangerous rock mass in the Xiaotunyan collapse zone in Sinan County has large range and volume,and fissures,concave cavities,and solution caves have developed.[Objective]In order to study the failure probability of passive protection nets for rockfalls in typical karst areas.[Methods]A three-dimensional model of the collapse zone through high-precision realistic modeling technology was constructed,by which the movement process of collapsed falling rocks was simulated.According to the results of the field investigation,aerial photography of the unmanned aerial vehicle and numerical simulation,an appropriate rockfall location layout for the passive protection net was selected.And based on the identification of the rockfall particle size,the different rockfall particle sizes were selected to simulate the interception effect of the passive protection net,then the failure probability of the passive protective net can be calculated.[Results]The results show that the rockfall breakthrough rates of 13 particle sizes vary:the interception effect of small to medium sized falling rocks with particle sizes ranging from 0.25 m to 2.25 m is effective,but the interception rate of passive protection net cannot reach 100%.When the particle size is larger than 2.25 m,the passive protection net fails,that is the upper limit of the design of the passive protection net under the Xiaotunyan collapse zone is the 2.25 m particle size of rockfall.According to the calculation,the failure probability of all rockfall particle sizes intercepted by the passive protection net is less than 5%,which is within the acceptable scope.[Conclusion]The research results provide a reference for rockfall protection measures in the Xiaotunyan collapse zone and are of great significance for the protection of life and property safety for people
作者
卢彦丞
李军
梁风
史文兵
王军义
LU Yancheng;LI Jun;LIANG Feng;SHI Wenbing;WANG Junyi(College of Resource and Environmental Engineering,Ministry of Education,Guizhou University,Guiyang 550025,China;Key Laboratory of Karst Geological Resources and Environment,Ministry of Education,Guizhou University,Guiyang 550025,China;Geological Brigade,Guizhou Bureau of Geological and Mineral Exploration and Development Bureau,Zunyi Guizhou 563000,China;Power China Guiyang Engineering Corporation Limited,Guiyang 550081,China)
出处
《地质科技通报》
CAS
CSCD
北大核心
2024年第3期240-250,共11页
Bulletin of Geological Science and Technology
基金
贵州省科技计划项目(黔科合基础-ZK[2022]一般075)
贵州省科技计划项目(黔科合基础-ZK[2021]一般228)
贵阳市科技计划项目(筑科合同[2023]-13-10号)。
