矩形隧道叠落穿越超高压燃气管的安全分析

北京地铁6号线草房-终点区间矩形隧道叠落穿越超高压燃气管线,周边环境复杂,隧道与管线净距仅为1.6 m;根据工期要求必须先施工上面的出入线,后施工下面的正线隧道.为了保证管线及隧道的安全,利用有限元软件对处理效果进行了模拟分析,并分别从方案选取、数值分析、施工工艺、地面加固、洞内支护等方面进行比选,最终确定了区间穿越超高压燃气管采用洞顶深孔注浆+中洞法分步开挖+出入线底板注浆的矿山法方案.从最终监控量测数据表明:本工程采取的设计方案、施工措施合理、经济,隧道及管线变形均未超过安全性要求,结论对城市地铁类似工程的设计和施工具有参考与指导意义.

Safety analysis of overlapped rectangular tunnels crossing under high pressure gas pipelines

The surrounding environment of tunnel is complex.The space of tunnel and pipeline is only 0.8 m. According to the construction schedule requirements, the upper release line should be constructed first, and the main track constructed latter.In order to ensure the safety of pipelines and tunnels, using the finite element software to simulate the effect of the treatment analysis, and the program, numerical analysis, construction technology, ground reinforcement, support of the cave and other aspects were selected from. At last, the interval through high pressure gas pipe mining methods are deep grouting in roof, center drift method in step and the program grouting the floor of release line. From the final monitoring data show that the chosen project design is reasonable construction measures, economic. Tunnel and pipeline deformation does not exceed safety requirements. This conclusions have reference and guiding significance for the design and construction of similar city subway projects.