地震工程学报Issue(4)：784-789,6.DOI:10.3969/j.issn.1000-0844.2014.04.0784
小净距隧道扩建爆破动力响应数值模拟方法研究
Numerical Simulation of Blasting Dynamic Response of Small Spacing Tunnel Expansion
摘要
Abstract
With the rapid economic development in China,an increasing number of highway tun-nels require reconstruction and expansion because the road traffic volume is increasing exponen-tially.The original Damaoshan highway tunnel is a separated four-lane expressway located be-tween Fuzhou city and Xiamen city,Fujian province,southeastern China.The expansion scheme of this tunnel includes new construction of a four-lane tunnel between the original two tunnels and expansion of the right-hand original tunnel into a four-lane structure.Thus,the expanded Damaos-han highway tunnel will comprise a series of closely spaced tunnels.The newly constructed four-lane tunnel,22 m long and 255 m2 wide,will be merely 5.89 m from the original tunnel.Moreo-ver,the structure safety of the nearby original tunnel must be ensured to maintain effective traffic flow during the explosions for the construction of the new tunnel.Thus,the blasting vibration must be strictly controlled.In this study,semi-empirical theory and direct initiation method are used to determine blasting loads in numerical simulation of blasting dynamic response.With the project background of the first application of the Damaoshan highway four-lane tunnel expansion, a numerical analysis model is established using LS-DYNA3D software from the direct initiation of explosives to simulate blasting effects on an adjacent operation tunnel.The numerical analysis model is based on a multi-material unit and fluid-structure interaction technique to simulate the explosive detonation and the dynamic response of the nearby structure,respectively.The element type is SOLID1 64,and the non-reflected boundary condition is used.Influences of the rock calcula-tion range,mesh size,material hardening condition,and failure strain on the numerical simulation are analyzed.The rock failure strain value in this study is obtained by comparing the explosive cavity radius between the numerical simulation and experience formula.The simulation results show that the blasting effects for the ideal elastic-plastic material model are larger than that for the hardening elastic-plastic model.The maximum relative error of vibration speed is approxi-mately 20%.Moreover,the numerical results of vibration velocity generally comply with the Sada-ovsk formula fitted by on-site measured data.Therefore,the results of this study are useful for tunnel constructions and similar projects.关键词
小净距隧道/隧道扩建/爆破振动/动力有限元Key words
small spacing tunnel/tunnel expansion/blasting vibration/dynamic finite element分类
交通工程引用本文复制引用
李秀地,蒋树屏,刘元雪,黄伦海..小净距隧道扩建爆破动力响应数值模拟方法研究[J].地震工程学报,2014,(4):784-789,6.基金项目
国家自然科学基金项目(51378496) （51378496）
福建省交通科技发展项目(200910) （200910）
