软弱围岩大断面隧道掘进爆破方案优化  

Optimization of blasting scheme for large section tunnel in soft surrounding rock

作　　者：谢超群 李启月[2] 陈元勇 张想 吴晓梦 XIE Chao-qun;LI Qi-yue;CHEN Yuan-yong;ZHANG Xiang;WU Xiao-meng(Southwest Engineering Co.,Ltd.,of CCCC First Highway Engineering Co.,Ltd.,Chengdu 610091,China;Scho ol of Resources and Safety Engineering,Central South University,Changsha 410083,China;Jiangxi V&T College of Communications,Nanchang 330013,China;Hunan Kenon Technology Co.,Ltd.,Changsha 410014,China)

机构地区：[1]中交一公局西南工程有限公司,成都610091 [2]中南大学资源与安全工程学院,长沙410083 [3]江西交通职业技术学院,南昌330013 [4]湖南金聚能科技有限公司,长沙410014

出　　处：《工程爆破》2022年第3期55-63,共9页Engineering Blasting

基　　金：国家重点研发计划资助项目(编号2016YFC0600802);江西省教育厅科学技术研究重点资助项目(GJJ204602)。

摘　　要：为解决软弱围岩大断面隧道爆破开挖引起的围岩损伤大、超欠挖严重等问题,对东天山特长隧道工程原爆破方案进行了优化研究,调整隧道开挖方法和爆破循环进尺,优化周边孔爆破参数、装药结构、起爆顺序及起爆网路等。结果表明:采用优化后的爆破方案进行开挖,抑制了掌子面“鼓肚”与拱腰围岩“台阶化”的现象,掌子面与底面平整;能够有效控制超欠挖,平均线性超欠挖小于250 mm;距掌子面25 m的测点最大振速为0.643 cm/s,符合爆破安全规程的有关规定。研究结果可对类似工程有一定的借鉴意义。In order to solve the problems of the large damage to surrounding rock and serious underbreak and overbreak caused by blasting excavation of large section tunnels with weak surrounding rock,the original blasting scheme of the long tunnel project in East Tianshan Mountain was optimized and studied,the excavation method and blasting cycle footage were adjusted,and the blasting parameters of surrounding hole,charge structure,initiation sequence and initiation circuit were optimized.The results show that the phenomenon of the underbreak of rock mass at the bottom of the face and the stratification of the surrounding rock of the arched abutment are restrained by adopting the optimizated scheme for excavation,the optimized blasting scheme can effectively control the overbreak and underbreak,and the average linear overbraek and underbreak is less than 250 mm.The maximum vibration velocity of the measuring point 25 m away from the face is 0.643 cm/s,which conforms to the relevant provisions of blasting safety regulations.The research results have certain reference for similar projects.

关 键 词：隧道工程 爆破优化 大断面隧道 轮廓控制 

分 类 号：TD235[矿业工程—矿井建设]