Research On Key Technology For Construction Of Expressway Shallow Depth Soft Rock Tunnels In Mountainous Areas

With the country in infrastructure investment is increasing, the national road transport rapid development,The the level of road is Increasing, traffic mileage has increased steadily. Highway construction in China’s infrastructure construction plays an important role. In highway construction, the Mileage tunnel option can be shortened, improve the standard linear, guarantee operational safety, protecting the environment. In recent years, the number of tunnels and expanding, especially in mountain highway construction. In complex geological and topographical conditions, Because bridge and tunnel connections, linear optimization needs, the construction has begun to take shape tunnel group. And will have broad market prospects and social benefits.Mountain tunnel design and construction technology, has conducted years of research, Also made a number of scientific research and engineering practice. However, in the mountain road tunnel design, construction and maintenance operations, there are still many technical problems to be solved. For shallow soft rock tunnel settlement mechanism of the lack of systematic and thorough analysis, Shallow need further propose rational design of soft rock tunnel construction methods and Excavation order. Because Mountain Highway through geological unit with the complexity and diversity of terrain, Especially in shallow soft rock tunnel design and construction methods has important practical significance for the construction of the project.In this paper, Yuxi mountain highway tunnel construction of the actual situation, rely on the Song Luan highway tunnel group, Applied research and engineering practice. Technology to improve the construction of the tunnel, reducing the project cost is of great practical significance.