Abstract: Tunnel constructions in the cold regions frequently encounter the frozen hazard due to the low temperature and the presence of water. During the design process, well drained and warm temperature retention are two key aspects. The low temperature tunnel construction techniques are studied in the Ningcan Tunnel of Qinghai Province. Both numerical analysis and analogy of the similar project methods are used in the determination of the warm temperature retention length, thickness of temperature isolation, installation as well as selection of the temperature isolation material are studied. The research results can be used for the construction of tunnel in the cold regions.

Key words: Cold Regions with High Attitudes, Ningcan Tunnel, Warm Temperature Retention, Water Proof and Drainage Measures