隧道爆破施工合理毫秒延期时间的数值研究  

Numerical Investigation into the Reasonable Delay Time in Millisecond in Blast Engineering of the Tunnel

作　　者：邵珠山[1] 王新宇[1] 乔汝佳[1] 

机构地区：[1]西安建筑科技大学土木工程学院,西安710055

出　　处：《地下空间与工程学报》2015年第4期1009-1015,共7页Chinese Journal of Underground Space and Engineering

基　　金：国家自然科学基金(10772143);教育部留学回国人员基金([2010]1174)

摘　　要：毫秒延期爆破作为降低爆破震动效应的主要措施,已广泛应用于实际工程。但毫秒延期间隔时间多以经验或现场爆破试验给出,数值模拟方面所做研究较少。基于ANSYS/LS-DANY有限元软件的动力分析功能,建立了隧道三维爆破模型。简要分析了最大段药量对爆破震动效应的控制作用,在此基础上首次定量研究了不同的毫秒延期时间对隧道衬砌动力响应的影响;并结合质点震动速度安全判据,给出了合理的毫秒延期爆破时间。本文定量研究毫秒延期爆破间隔时间的方法及所采用的模型,可结合不同隧道的具体爆破条件修正后推广应用。Millisecond delay blasting technique,as a key technical measure to reduce blasting vibration effects,has been widely used in engineering. But the numerical simulation research on millisecond time is quite few,and the millisecond time used in engineering is usually given by experience or field blasting experiment. Based on the dynamic analysis function of ANSYS / LS-DYNA finite element program,a three-dimensional blasting model of the tunnel is established,and the controlling effect of maximum charging weight on blasting vibration is analyzed. On this basis,the effect of millisecond time on the vibratory response of tunnel lining is quantitatively studied for the first time. Combining the study with the safety criteria of particle vibration velocity,a reasonable millisecond delay time is obtained. The method and model for millisecond delay time research adopted in this paper could be generalized and applied in engineering with considering the local blasting features.

关 键 词：钻爆开挖 动力响应 毫秒延期间隔时间 数值模拟 

分 类 号：TU45[建筑科学—岩土工程]