摘要
为研究减振孔在基坑爆破开挖中的减振效果,利用大型动力ANSYS/LS-DYNA有限元软件建立三维数值计算模型,对不同参数下的减振孔模型的减振效果进行系统分析,得出不同减振孔布置参数对减振效果影响的一般规律;同时,结合工程实际,在爆破区与保护区之间设置不同的参数减振孔对爆破振动进行试验,将理论计算与试验结果对比分析,总结出打设1~3排减振孔最大减振率分别能达到27.19%、38.91%及67.55%的降振效果,为减振孔参数设计提供可参考的依据。
In order to study the vibration reduction effect of the vibration reduction hole in the blasting excavation of the foundation pit,large dynamic ANSYS/ls-dyna finite element software was used to establish a three-dimensional numerical calculation model, and systematically analyzes the vibration reduction effect of the vibration reduction hole model under different parameters, obtains the general rule of effect of different hole layout parameters on vibration reduction effect. At the same time, according to the engineering practice,different parameters of vibration reduction holes were set between the blasting area and the protection zone to test the blasting vibration, and the theoretical calculation and test results were compared and analyzed. It was concluded that the maximum vibration reduction rates of holes with row 1 to row 3 could reach 27.19%, 38.91% and 67.55%, respectively. It provides a reference basis for the design of vibration hole parameters.
作者
丁恒军
DING Heng-jun(China Railway Tunnel Stock Co.Ltd.,Zhengzhou 450000,China)
出处
《工程建设与设计》
2019年第24期61-66,共6页
Construction & Design for Engineering
关键词
基坑爆破
减振孔
减振效果
降振试验
foundation pit blasting
damping hole
damping effect
decreasing vibration test
