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成渝高速公路复线(重庆段)巴岳山隧道主要由砂岩、页岩、灰岩及部分白云质灰岩和白云岩夹岩溶角砾岩组成,洞身开挖按照不同的围岩段采用不同的洞身开挖方法,洞口浅埋隧道段采用光面爆破,Ⅳ、Ⅴ级围岩采用双侧壁导坑开挖法。洞身深埋段采用光面爆破,Ⅳ级围岩采用三台阶七步法施工,Ⅴ级围岩采用CD法施工,Ⅴ级围岩成洞困难时采用双侧壁导坑法施工。大断面高速公路隧道开挖质量的控制,对整个隧道的施工意义重大,采用合理的开挖方案,不仅确保了隧道施工的质量和安全,也为项目成本的控制指出了一条可行的方向。因此高速公路大断面隧道的开挖技术对类似项目具有一定的参考价值,可供类似工程借鉴。
The Buyushan tunnel of the Chengdu-Chongqing Expressway (Chongqing section) is mainly composed of sandstone, shale, limestone and some dolomitic limestone and dolomite intercalated karst breccias. According to different surrounding rock sections, the tunnel excavation adopts different Hole excavation method, shallow hole tunnel section using smooth blasting, Ⅳ, Ⅴ grade rock using double-sided pilot excavation method. The deep hole of the tunnel body is made of smooth blasting. The grade IV surrounding rock is constructed by three steps and seven steps. The grade V surrounding rock is constructed by CD method. When the grade V surrounding rock becomes difficult, the double sidewall guide pit method is used. The control of the tunnel excavation quality of large-section expressway is of great significance to the construction of the whole tunnel. The reasonable excavation scheme not only ensures the quality and safety of the tunnel construction, but also points out a feasible direction for the project cost control. Therefore, the excavation technology of large-section highway tunnel has certain reference value for similar projects, which can be used for similar projects.