摘要
在乌干达卡鲁玛水电站尾水隧洞开挖施工中,为了解决大断面硬质岩石隧洞开挖炮孔数量多、钻孔时间长、施工进度慢等问题,实际施工中调整了隧洞爆破布孔思路,改变了传统布孔方式,提出了“隧洞开挖宽孔距布孔”的理念。通过一系列爆破试验,成功将原设计上台阶开挖炮孔数量246个减少到181个,有效降低了炮孔数量,实现了快速掘进。试验表明:在大断面硬质岩石隧洞开挖中,通过采用宽孔距爆破技术,炮孔数量降低了26.42%,有效缩短了钻孔时间,加快了开挖单循环速度,最终实现了主洞上层开挖单面月进尺230.2 m(开挖断面102.02 m^(2)),为同类隧洞的开挖提供了经验。
During the tunnel excavation works in Tailrace Tunnel of Karuma HPP Project,Uganda,in order to solve the problems of large section hard rock tunnel excavation,such as large number of bore holes,long drilling time and slow construction progress,we adjusted the idea of tunnel blasting layout in actual construction,changed the traditional layout method,and proposed the concept of"wide-space bore hole layout method for tunnel excavation".Through a series of blasting tests,we successfully reduced the number of top bench excavation bore holes in the original design from^(2)46 to 181,effectively reduced the number of bore holes and achieved rapid excavation.The test shows that in the excavation of large section hard rock tunnel,by using wide-space blasting technology,the number of bore holes was reduced by 26.42%,effectively shortening the drilling time and speeding up the single cycle of excavation,finally achieving a good result of 230.2 m(excavation section 102.02 m^(2))of monthly progress on one side of the top bench excavation of the main tunnel.
作者
杨玉银
杨仕杰
张艳如
黄浩
苑庆森
YANG Yu-yin;YANG Shi-jie;ZHANG Yan-ru;HUANG Hao;YUAN Qing-sen(STECOL Corporation,Tianjin 300384,China;Jincheng College of Sichuan University,Chengdu 611731,China)
出处
《工程爆破》
CSCD
北大核心
2024年第1期66-73,共8页
Engineering Blasting
关键词
隧洞开挖
硬质岩石
宽孔距布孔
试验研究
tunnel excavation
hard rock
wide-space disposal bore hole
pilot study
作者简介
杨玉银(1968-),男,正高级工程师,从事安全管理、地下工程及土石方明挖爆破技术方面的研究。E-mail:752153592@qq.com;通信作者:杨仕杰(1996-),男,学士,工程师,从事施工技术与管理工作。E-mail:455214373@qq.com。
