Importance:
( 1)? Importance: Transportation is an important facility of national infrastructure and plays a very important role in the development of national economy. ?
(2) Necessity: The economic development experience of all countries in the world shows that a fast and smooth traffic network is an indispensable condition for economic development.
(3)? Urgency: At present, the total mileage of expressways in China is still very small (200 1 nearly 20,000 kilometers at the end of the year), which can't meet the needs of development and leads to the overload operation of various traffic facilities. Traffic accidents, traffic jams and traffic hazards have become a major social problem, hindering the development of national and regional economy.
Development prospect of tunnel engineering and problems to be solved;
(1) Development prospect of tunnel engineering: With the development of China's market economy, expressways extend from coastal areas to western mountainous areas, and the number and construction scale of highway tunnels are increasing. Urban traffic is still in its infancy, large-scale traffic is in the ascendant, and the development prospect of tunnel industry is very broad.
(2) Development direction of tunnel engineering: reasonable planning, environmental protection, non-blasting mechanized construction, reliable and reasonable design and safe use.