This paper introduces a set of quick construction experiences in the process of passing through the soft rock in the construction of the underground yard,and analyzes on its economic efficiency.

Especially in soft rock the problem is more serious.

Large section tunnel construction technology in fractured weak strata;

Large-section room construction technique in weak strata in Jinchuan mine area

Fractal analysis and numerical modeling disintegrate process of red-bed soft rock;

Results show that not only surrounding rock deformation and quadratic stress correspond with depth,but also red-bed soft rock has rheology in shallow underground tunnel.

Considering the engineering performance of the red-bed soft rock,based on a wide investigation and a technical and economic study of existing freeway project in several provinces in western China red-bed soft rock area,a comprehensive evaluation indicator system was established for cutting and tunnel alternative assessment with gray relational analysis method.