隧道隧底开挖控制爆破施工技术  

Controlled Blasting Construction Technology for Tunnel Bottom Excavation

作　　者：康大伟 KANG Da-wei(The 3rd Engineering Co.,Ltd.of China Railway 12th Bureau Group,Taiyuan 030024,China)

机构地区：[1]中铁十二局集团第三工程有限公司,太原030024

出　　处：《价值工程》2024年第6期74-76,共3页Value Engineering

基　　金：中铁十二局集团有限公司科技研究开发计划项目(集团2022研-15号)。

摘　　要：隧道拱部围岩超欠挖控制技术已较为成熟,光面爆破等控制爆破技术已广泛应用于隧道建设,但是针对隧底围岩开挖施工,仍采用集中装药的方式进行爆破,超挖情况较为严重。基于以上原因,依托广湛铁路大脊山隧道,对仰拱、底板及中心水沟等小尺寸结构物爆破技术进行探索,通过多循环的爆破参数研究与改进,总结得到了大脊山隧道隧底控制爆破参数,较好地指导了隧道后续施工,仰拱、底板及中心水沟超欠挖得到了较好地控制,减少了隧道施工工序循环时间,保证了隧道提前贯通,综合效益显著。The control technology for over excavation and under excavation of tunnel arch surrounding rock has become relatively mature,and control blasting techniques such as smooth blasting have been widely used in tunnel construction.However,for the excavation of tunnel bottom surrounding rock,centralized charging is still used for blasting,and the situation of over excavation is relatively serious.Based on the above reasons,relying on the Dajishan Tunnel of the Guangzhou Zhanjiang Railway,the blasting technology for small-sized structures such as the inverted arch,bottom plate,and central water ditch was explored.Through multi cycle blasting parameter research and improvement,the controlled blasting parameters for the bottom of the Dajishan Tunnel were summarized,which effectively guided the subsequent construction of the tunnel.The over excavation of the inverted arch,bottom plate,and central water ditch was well controlled,reducing the cycle time of the tunnel construction process,Ensuring the early completion of the tunnel and significant comprehensive benefits.

关 键 词：隧底 超欠挖 控制爆破 分次爆破 

分 类 号：U458[建筑科学—桥梁与隧道工程]