| This paper is based on the Jiuzhai tunnel of Guiguang railway. It focuses on construction method comparison of Jiuzhai tunnel, to choose reasonable construction method. At the same time,for successful through the complex strata, developed a more detailed construction technology programs and measures, to ensure the construction safety.Jiuzhai tunnel is located in Yunnan-Guizhou Plateau,which is complex geological structure, include gas coal strata, karst caves, fractured zones, etc. Tunnel construction is dangerous and difficulty, almost led to a major accident. Therefore, a reasonable choice is extremely important for excavation methods. the paper chose the commonly used two-step excavation method and CRD method and CD method to compare and analysis rock stress field, displacement field, the plastic deformation zone and supporting structure by Ansys finite element software, to determine safely and high efficiencly construction construction methods. the excavation method is safe,high construction efficiency.In the construction of complex formation, regulate safe and effective method is important for construction. According to the characteristics of the tunnel information construction, establish the monitoring and measurement system during tunnel construction process, to verify the security and stability of the supporting structure by monitoring data, for selecting the monitoring data of several typical section of this article as the representative for analysis supporting structure deformation displacement trend. Another tunnel construction encountered karst area, gas Stratum and fracture zone, for successful through the complex strata, developed a more detailed construction technology programs and measures. |
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