高速公路分叉隧道的应用及开挖技术研究

Research on Application and Excavation Technology of Expressway Bifurcated Tunnel

隧道作为公路的重要组成部分,在全国各地公路工程常规使用,常见的隧道形式有分离式隧道、连拱隧道等,但受公路线形控制或隧道前构筑物形式控制,无法采用常规隧道形式,故结合现场实际情况提出分叉隧道的设计理念。现对分叉隧道的应用及开挖技术研究进行分析,针对不同围岩采取不同的支护方式和爆破参数,并进行专项通风设计。根据现场实际开挖揭露围岩地质情况,根据超前地质预报结果,适时提出设计优化方案。

As an important part of highway,tunnel is widely used in highway engineering all over the country.Common tunnel forms are split tunnel,multi-arch tunnel and so on.However,restricted by the highway alignment or the form of structures in front of the tunnel,the conventional tunnel form can not be adopted in this paper.Therefore,the design concept of the cross-section tunnel is put forward in combination with the actual situation on site.In this paper,the application and excavation technology of divergent tunnel are analyzed,different support methods and blasting parameters are adopted for different surrounding rocks,and special ventilation design is carried out.According to the actual excavation on site,the geological conditions of surrounding rocks and the results of advanced geological prediction,the design optimization scheme is put forward in time.