云南省公路隧道辅助通道设计实践与思考

Practice and Reflection on Design of Auxiliary Channels for Highway Tunnels in Yunnan Province,China

为解决山区高速公路特长隧道辅助通道设计中方案比选多、工作繁琐及技术要求高等难题,结合多座特长隧道设计与咨询实践,研究和总结辅助通道及地下联络道的总体方案、结构设计等关键技术。主要得出以下结论:1)辅助通道方案应从辅助施工和运营通风2个角度出发,综合比选后确定。2)对较小交通量隧道,火灾工况下烟雾行程可适当突破5000 m,采用全射流纵向式排烟。3)提出的中置式地下风机房方案可减少约45%的地下洞室工程规模,有效降低施工风险和工程造价。4)采用互补式通风可有效降低土建规模,且运营费用低。

There are many choices in design scheme of auxiliary tunnels for mountainous expressway extra-long tunnels,and it cost time and labor with high technical requirements.Therefore,the overall plan,structural design,and other key technologies of auxiliary tunnels and underground connecting tunnels are studied and summarized based on the design and consulting practice of multiple extra-long tunnels completed.Main conclusions are as follows:(1)The study of auxiliary channel schemes should be determined from the perspectives of auxiliary construction and operational ventilation,and comprehensive scheme comparison and selection should be conducted.(2)For tunnels with small traffic volume,the smoke stroke can appropriately exceed 5000 m under fire conditions,and full jet longitudinal smoke exhaust should be adopted.(3)The proposed"central underground fan room"scheme can reduce the scale of underground tunnel engineering by approximately 45%,effectively reducing construction risks and engineering costs.(4)The use of"complementary ventilation"can effectively reduce the scale of civil engineering and operating costs.