This paper introduces the general situation of a certain engineering, expounds the construction plan and working procedure of the dark operation in open tunnel, and discusses on the key construction techniques and the monitoring and measurement.

Concrete applying example of open tunnel subsurface excavation in tunnel construction;

3 contract in Rui-Feng railway,the construction design scheme and construction controlling points of open excavation changing into hidden hole construction were introduced.

Hue which is a kind of subtle visual effect, is generally born of the factors, such as the relationship between cold and warm colors, the contrast between light and shade as well as the impression of space.

Five corresponding points of teaching of charcoal drawing were found through analysis of the uniqueness,which were the training of details,the training of abstract composition,the training of light and shade,the training of materials,and the training of view point and view angle.

Aseismatic analysis on open tunnels of freeway in seismic region with strong motion;

According to the open tunnel design,more than 10 m thick of soil will be filled which will have impacts on the open tunnel structure security.