大坝灌浆帷幕爆破振动响应特性的数值模拟  

Numerical Simulation about Blasting Vibration Response Characteristics of Grout Curtain of Dam

作　　者：陈明[1,2] 邓珂 张俊[1,2] 严鹏 王高辉[1,2] 肖燕君[1,2] CHEN Ming;DENG Ke;ZHANG Jun;YAN Peng;WANG Gao-hui;XIAO Yan-jun(State Key Lab of Water Resources and Hydropower Engineering Science;Key Lab of Rock Mechanics in Hydraulic Structure Engineering Ministry of Education,Wuhan University,Wuhan 430072,China)

机构地区：[1]武汉大学水资源与水电工程科学国家重点实验室,武汉430072 [2]武汉大学水工岩石力学教育部重点实验室,武汉430072

出　　处：《爆破》2018年第3期141-146,共6页Blasting

基　　金：国家重点研发计划项目(2016YFC0402008);国家自然科学基金资助项目(51779193)

摘　　要：针对爆破施工对邻近灌浆帷幕的影响问题,基于ANSYS-LSDYNA分别建立了坝基段和岸坡段灌浆帷幕的二维有限元动力模型,采用数值方法模拟研究了爆破施工时三种不同基岩条件下灌浆帷幕的爆破振动响应特性。结果表明:随岩体硬度提高,帷幕处质点振动速度减小而第一主应力增大。对于同一岩体,岸坡段灌浆帷幕的质点振动速度和第一主应力的最大值均出现在帷幕的顶部,而坝基段灌浆帷幕的质点振动速度与第一主应力最大值出现的位置不同。因此,灌浆帷幕的爆破振动影响监测点布置,需要综合考虑爆源位置、测点部位、岩体性能的影响。The impact of blasting on nearby grout curtain can not be ignored in actual projects. Thus,two-dimensional dynamic finite models of grout curtain under dam foundation and inside bank,based on ANSYS-LSDYNA,are built to study the blasting vibration characteristics of grout curtain constrained within three kinds of rock foundation by numerical simulation. Results show that peak particle velocity（ PPV） decreases while the first principal stress increases with the rise of rock hardness. For the grout curtain inside bank slope,the maximum PPV and first principal stress are both attained on the top on grout curtain. But for curtain under dam foundation,the maximum values of the first principal stress and PPV emerge at different positions. Therefore,arrangement of blasting vibration monitoring points should take blasting source,monitor site and rock properties into consideration comprehensively.

关 键 词：灌浆帷幕 爆破振动 质点峰值振动速度 数值模拟 

分 类 号：TV542[水利工程—水利水电工程]