摘要
以浙江温岭楼山隧道扩挖工程为背景,提出了双侧壁导坑法和台阶法两种爆破设计方案,利用ANSYS软件模拟两种工况下最大药量爆破阶段动态过程,结合《爆破安全规程》,综合比选安全合理的爆破方案,得出以下结论:通过理论公式计算设计出了两种方案的爆破参数、炮孔排布、爆破网络线、装药结构;两个方案中,右洞在爆破后迅速达到峰值,而爆破振动由右洞至左洞传递需要时间,左洞在爆破后约0.01s后达到峰值,随后振动速度呈波浪状下降趋势并最终平稳地趋于零,模拟结果与实际情况相符;两种方案爆破掘进时对楼山隧洞左洞的影响均低于安全允许标准,满足施工过程中左洞正常交通的要求;方案二振动速度均符合安全标准,隧道模型模拟质点振动速度满足从拱顶到拱底逐渐增大的规律,而方案一隧道拱顶处振动速度大于安全允许值,因此在楼山隧道实际工程中应采用方案二双侧壁导坑法扩挖。
Taking the expansion project of Loushan Tunnel in Wenling,Zhejiang Province as the background,two blasting design schemes of double-sided guide pit method and bench method are put forward.The dynamic process of maximum charge blasting stage under two working conditions is simulated by ANSYS software.Combining with Blasting Safety Regulation(GB 6722-2014),the safe and reasonable blasting scheme is selected comprehensively.The following conclusions are drawn:the blasting parameters,hole arrangement,blasting network and charge structure of the two schemes are designed by theoretical formula calculation.In the two schemes,the right tube quickly reaches its peak value after blasting,while the blasting vibration transfers from the right hole to the left hole takes time.The left tube reaches its peak value about 0.01 safter blasting,and then the vibration velocity decreases in a wave shape and eventually tends to zero smoothly.The simulation results are consistent with the actual situation.The impact of blasting excavation of the two schemes on the left tunnel of Loushan Tunnel is lower than the safety allowable standard,which meets the normal traffic requirements of the left tunnel in the construction process.The vibration speed of scheme two meets the safety standard,and the vibration velocity of particle in tunnel model meets the law of increasing gradually from vault top to vault bottom,while that of scheme one meets the safety allowable value of large area at vault top.Therefore,in the actual project of Loushan Tunnel,the method of double-sided guide tunnel should be adopted to enlarge excavation.
作者
倪迪
陈明
康三月
NI Di;CHEN Ming;KANG San-yue(Taizhou Communications Investment Group,Taizhou 318000,China;Zhejiang Tunnel Engineering Company,Hangzhou 310005,China)
出处
《公路》
北大核心
2019年第12期298-303,共6页
Highway
关键词
隧道扩挖
爆破设计
数值模拟
爆破振速
方案
tunnel expansion
blasting design
numerical simulation
blasting vibration velocity
scheme
