隧洞塌方冒顶处理设计方案比选与研究

Comparison and Research of Design Schemes for Treatment of Tunnel Collapse and Roof Falling

四川省向家坝灌区北总干渠一期一步工程邱场分干渠自贡段水井坝上3号施工支洞发生塌方冒顶后,为保证施工安全,节约工期,经对塌方冒顶原因进行分析,根据现场情况提出了超前支护加固处理、洞外明挖处理、新建支洞、洞内调整等4种处理方案。通过方案比选与研究,明确了这4种方案的投资大小、施工工期及优缺点,最终经专家评审,选用了较为安全的洞外明挖处理方案。

After the collapse and roof fall of No. 3 construction branch tunnel on the water well dam of the Zigong section of Qiuchang branch canal in the first stage of the north main canal of Xiangjiaba Irrigation Area in Sichuan Province, in order to ensure construction safety and save construction period, the causes of collapse and roof fall are analyzed, and four treatment schemes, including advance support and reinforcement, open excavation outside the tunnel, new branch tunnel and adjustment inside the tunnel, are put forward according to the site conditions.Through scheme comparison and research, the investment size, construction period, advantages and disadvantages of the four schemes are defined. Finally, after expert review, a safer open-excavation treatment scheme outside the tunnel is selected.