基于FLAC^(3D)对爆破振动下某土坝的安全振速预测  

Prediction of Safe Blasting Vibration Velocity of an Earth Dam Based on FLAC^(3D)

作　　者：李胜林[1] 刘志远 张会歌[1] 孟令豪 LI Sheng-lin;LIU Zhi-yuan;ZHANG Hui-ge;MENG Ling-hao(School of Mechanics and Civil Engineering,China University of Mining and Technology(Beijing), Beijing 100083,China)

机构地区：[1]中国矿业大学(北京)力学与建筑工程学院,北京100083

出　　处：《北京理工大学学报》2018年第10期1006-1011,共6页Transactions of Beijing Institute of Technology

基　　金：国家自然科学基金资助项目(51574247;10272109);国家教育部高等学校博士学科点专项科研基金资助课题(20060290009);中央高校基本科研业务专项资金资助项目(2010QL05)

摘　　要：在大量现场爆破振动监测的基础上,对速度信号进行分析,近似得到了坝体的黏滞阻尼比,基于坝体动力响应特征通过FLAC^(3D)建立了某土石坝的2维模型.基于土体力学参数计算简化得到了坝基瑞利波分布函数,确定了使坝体发生最大响应的振动信号主频为2.00Hz,通过加大最不利地震波振幅,计算得到使坝体破坏的速度阈值为16cm/s,以此阈值作为土坝安全振速,可有效保证坝体的结构安全.Based on a large amount of on-site blasting vibration monitoring and signal analysis,the approximate viscous damping ratio of the earth dam was obtained,and the quasi-two-dimensional model of an earth dam was established based on the dynamic response characteristics of the dam by FLAC 3D.The Rayleigh wave distribution of the dam foundation was obtained based on the calculation and simplification of soil mechanical parameters,and the main frequency of the dam body was determined.The frequency of the most unfavorable seismic waves was 2.00 Hz.The velocity threshold of dam damage was 16 cm/s by increasing the amplitude of the worst seismic waves,and the threshold was taken as the safe vibration velocity of the dam,which effectively guaranteed the safety of the dam.In this paper,dam vibration speed was predicted by FLAC 3D,which can be referred to and used by production and scientific research units.

关 键 词：土坝 FLAC^3D 爆破地震 数值模拟 最不利地震波 

分 类 号：TD824[矿业工程—煤矿开采]