摘要
为探究隧道改扩建工程设计方案及安全控制,本文根据隧道爆破相关理论对某国道隧道工程开展实例分析,系统研究隧道爆破施工方案、爆破参数选取、爆破网路设计,并探究隧道爆破安全控制,其中计算的工程爆破振速均符合规范规定,现场爆破情况良好验证了爆破设计方案的准确性。主要研究结论如下:(1)隧道支护强度、超前支护及开挖方式应随围岩条件的恶化而同步增强,连拱隧道与明洞的爆破设计相比分离式隧道需进一步优化并关注隧道连接位置;(2)爆破时侧墙与顶部分别采用预裂与光面爆破方式,不同围岩条件及施工状况下爆破参数应有差异,深孔爆破主要用于主爆孔,浅孔爆破主要用于明洞开挖段路基与隧道下台阶;(3)爆破设计时炮孔布设、爆破方式及参数、爆破网络应随地质状况与隧道类型进行优化调整,采用预裂与光面爆破结合的方式并严格控制爆破飞溅;(4)现场通过施工爆破控制与振动监测有效控制爆破扰动,现场爆破情况良好并且计算所得不同类型隧道爆破振速符号规范要求验证了爆破方案的准确性。
To explore the design scheme and safety control of tunnel renovation and expansion projects,a case analysis of a certain national highway tunnel project based on the theory of tunnel blasting was conducted.The tunnel blasting construction plan,blasting parameter selection and blasting network design were systematically studied,and the safety control of tunnel blasting was explored.The calculated engineering blasting vibration velocity was in accordance with the specification,the on-site blasting situation was good,which verified the accuracy of the blasting design scheme.The main research conclusions are as follows:(1)The strength of tunnel support,advanced support,and excavation methods should be strengthened synchronously with the deterioration of surrounding rock conditions.Compared with the blasting design of split tunnel,the blasting design of double arch tunnels and open cut tunnels need to be further optimized and the connection position of tunnels needs to be paid attention to;(2)During blasting,pre splitting and smooth blasting methods are used for the side walls and top respectively.There should be differences in blasting parameters under different surrounding rock conditions and construction conditions.Deep hole blasting is mainly used for the main blasting hole,while shallow hole blasting is mainly used for subgrade of open tunnel excavation section and tunnel step;(3)During blasting design,the layout of blast holes,blasting methods and parameters,and blasting networks should be optimized and adjusted according to geological conditions and tunnel types.A combination of pre splitting and smooth blasting should be used,and blasting spatter should be strictly controlled;(4)Blasting disturbance is effectively controlled through construction blasting control and vibration monitoring,the site blasting condition is good and the calculation of different types of tunnel blasting vibration velocity symbol requirements verify the accuracy of the blasting scheme.
作者
翁明祥
章琪
乐军庆
潘文韬
WEN Ming-xiang;ZHANG Qi-le;LE Jun-qin;PAN Wen-tao(Hangzhou Traffic Engineering Group Co,Ltd,Hangzhou 310007,China;Zhejiang Institute of Communications,Hangzhou 311112,China)
出处
《浙江交通职业技术学院学报》
CAS
2024年第2期26-33,共8页
Journal of Zhejiang Institute of Communications
关键词
隧道工程
爆破设计
安全控制
爆破参数
爆破网络。
tunnel engineering
blasting design
security control
blasting parameters
blasting network
